‘Buy now, pay later’ is everywhere this holiday season. Here’s how to avoid a debt hangover

Source: The Conversation – Canada – By Vivek Astvansh, Associate Professor of Quantitative Marketing and Analytics, McGill University

Each holiday season brings a predictable surge in consumer spending, but the way shoppers finance that spending is changing rapidly. While credit cards once dominated online checkouts, the growing popularity of buy now, pay later (BNPL) arrangements is changing how households manage short-term expenses.

BNPL refers to a short-term payment plan that retailers offer to shoppers at the point of purchase. The most common model is “pay-in-four” — rather than paying the full amount up front, the shopper pays 25 per cent immediately and the remaining 75 per cent over three equal instalments, typically debited automatically every two weeks.

This structure makes BNPL feel relatively frictionless and, for many shoppers, deceptively inexpensive.




Read more:
The hidden risks of buy now, pay later: What shoppers need to know


In 2024, BNPL accounted for five per cent of e-commerce transactions, a proportion expected to increase by 58 per cent by 2030. In comparison, credit cards accounted for 20 per cent of e-commerce transactions in 2024, and this share is projected to increase by only three per cent by 2030.

With half of consumers planning to rely on BNPL for their holiday purchases in 2025, understanding this shift has never been more timely.

As households prepare for another holiday season of spending, BNPL will appear across many checkout pages with promises of convenience and flexibility. But before clicking “pay later,” consumers should recognize that these loans carry real financial consequences.

Why is BNPL so attractive?

Two factors explain BNPL’s appeal. First, the time value of money suggests that funds available in the present are more valuable than the same amount in the future. By reducing the immediate out-of-pocket cost, it offers the impression of greater financial breathing room.

Many consumers also believe BNPL is always interest-free. While the pay-in-four model usually carries no interest, monthly payment plans usually do, sometimes as high as 35.99 per cent. The comparable highest annual percentage rate for credit cards is 26 per cent.

Second, BNPL loan provider companies such as Klarna, Affirm and Afterpay usually run only “soft” credit checks, which don’t affect a borrower’s credit score. This has led to a widespread assumption that BNPL primarily serves individuals with limited credit access.

But in practice, usage spans income levels. In Canada, for example, 40 per cent of BNPL users report high household incomes.

Such widespread use, however, is not without risks.

Why is BNPL risky?

Despite its user-friendly design, BNPL changes how people evaluate purchases. Its psychological effects can encourage overspending and contribute to longer-term financial strain.

BNPL can lead shoppers to prioritize immediate gratification over the delayed pain of payment, instilling what I call a “buy now, regret later” mentality.

Research has found that BNPL adoption increases shoppers’ purchase frequency and purchase amount. The effect is stronger for shoppers who are promotion-sensitive, young and low-income.

More worryingly, BNPL users incur higher overdraft charges, credit card interest and late fees than non-users. Shoppers are particularly vulnerable to overspending during the holiday season. While spending increases in holiday seasons, income does not, leading to debt accumulation.

5 points to keep in mind

Before choosing BNPL at checkout, shoppers should take a moment to consider what they’re agreeing to. The five points below can help consumers navigate these services more safely and avoid common pitfalls.

1. BNPL appears under other names. Not all instalment plans are described as BNPL, so make sure to read terms carefully to avoid being misled by marketing language.

2. BNPL can amount to a loan on top of a loan. When payments are drawn from a credit card, you are effectively borrowing twice and incurring a double risk. If an automatic debit fails, late payment fees can be substantial. Do not be misled when the checkout page states “you’ll never pay interest or late fees.”

3. Governments are increasingly asking BNPL companies to conduct hard credit checks and report defaulters to other financial institutions and governments. As a result, assurances that “your score won’t be affected” may no longer be reliable.

4. Consumer protection remains uneven. It’s unclear which government agency (if any) oversees BNPL complaints. Until regulations are fully developed and consistently enforced, your financial security is your responsibility.

5. BNPL expands the number of companies that handle your data. With credit cards, one financial institution manages the transaction. Under BNPL, consumers may shop at numerous retailers using different BNPL providers. Tracking which provider handled which purchase can be difficult and complicate disputes over unrecognized credit card charges.

3 questions to ask yourself before using BNPL

BNPL can be useful when employed thoughtfully, but it’s not suitable for every shopper or every purchase. Asking yourself the following questions can help you determine whether BNPL aligns with your financial habits and long-term goals.

  1. Who is offering the loan? Review the BNPL provider’s frequently asked questions and payment policies. Compare firms such as Affirm, PayPal, Afterpay and Klarna. Obfuscated and unclear answers signal less transparency, and you should avoid using such companies.

  2. Do you tend to buy products on impulse and lack financial self-control? If yes, be mindful of the risks of BNPL usage, as it may amplify that tendency.

  3. Would strengthening your financial literacy improve your decision-making? If so, consider subscribing to reliable financial education resources before relying heavily on BNPL.

BNPL is a fintech innovation. Used responsibly, it can help shoppers maintain liquidity. However, used carelessly, it can make it easier for shoppers to accumulate debt. As the holiday season approaches, an informed approach will help you appreciate its benefits and avoid risks.

The Conversation

Vivek Astvansh does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. ‘Buy now, pay later’ is everywhere this holiday season. Here’s how to avoid a debt hangover – https://theconversation.com/buy-now-pay-later-is-everywhere-this-holiday-season-heres-how-to-avoid-a-debt-hangover-271286

The race to mine the Moon is on – and it urgently needs some clear international rules

Source: The Conversation – UK – By Adam Urwick, Junior analyst, RAND Europe, RAND Europe

The vision of mining space for resources is no longer science fiction. The Moon’s proximity to Earth and the presence of precious resources make it an increasingly attractive prospect for exploitation.

Resources thought to be present on the Moon include uranium, potassium,
phosphorus, water ice, platinum group metals and helium-3. The last of these is a rare isotope that could help power relatively clean fusion energy in future.

There are billions of dollars in it for companies able to kickstart mining operations, even if such returns are still years away. Technological breakthroughs in launch and exploration capabilities are occurring at breakneck pace. In the US, Seattle-based startup Interlune, working with Iowa industrial manufacturer Vermeer, is developing an electric lunar excavator designed to extract helium-3.

Their prototype can process up to 100 metric tons of lunar soil per hour. Interlune plans a 2027 mission to confirm helium-3 concentrations before deploying a pilot plant in 2029.

The Pittsburgh-based space company Astrobotic is developing the Griffin-1 lander to transport a rover designed by the California-based company Astrolab for surface analysis. A different lander called Nova-C,, built by Intuitive Machines in Houston, is being designed to conduct analysis of lunar soil and rock under Nasa’s Prism programme. Prism is a science and technology initiative designed to support various aspects of lunar exploration.

Meanwhile, Nasa’s Polar Resources Ice Mining Experiment 1 (Prime-1), which was carried to the Moon this year by an Intuitive Machines lander, demonstrated Honeybee Robotics’ Trident drill on the lunar surface. Trident both drills and extracts samples of lunar soil.

SpaceX’s giant Starship rocket, which has a large payload capacity and reusable design, could send multiple large experiments to the Moon, and cut launch costs by as much as US$250–US$600 (£188-£451) per kg. Assuming it overcomes its teething problems, Starship could be the game changer that makes large-scale lunar infrastructure and resource missions economically viable.

While US-led initiatives have been commonplace in lunar exploration, new political and corporate players are emerging globally. China aims to achieve human lunar landings by 2030, with plans for the robotic construction of lunar bases in partnership with Russia and other nations. This would establish an international Lunar Research Station by 2035.

Nova-C
Intuitive Machines’ Nova-C lander is being used to test capabilities relevant to mining.
Intuitive Machines

Australia’s 2026 rover will put its mining expertise to work extracting oxygen and collecting soil on the Moon, while Japan’s Slim mission focuses on precision landings that can target resource-rich areas. At the same time ispace, a Japanese company, is developing a mini rover to explore lunar resources.

In the EU, the Argonaut programme is developing the Esa (European Space Agency)‘s first lunar lander, with the involvement of a growing body of industrial enterprises across Europe. These missions are critical for gathering data and capabilities needed to understand what’s actually available on the Moon and how we might one day mine it.

Frozen treaties

Yet despite evolving technical capabilities, the international legal framework governing exploitation of the Moon is both very limited and frozen in the Cold War era. The 1967 outer space treaty established that space cannot be subject to national appropriation, but debate remains as to whether this prohibition extends to private entities extracting resources.

The treaty’s article I declares exploration shall benefit “all mankind”, yet provides no mandatory mechanism for sharing benefits, leaving it entirely to nations that have conducted activities to decide how, or whether, to share benefits at all.

The 1979 Moon agreement attempted to designate lunar resources as the “common heritage of mankind” and establish an international regime for exploitation. This agreement received only 15 ratifications, and none from spacefaring powers. The “common heritage” concept met fierce opposition from industrialised countries, who viewed it as restricting their technological advantage.

National legislation, as well as other types of agreement, has filled the vacuum. The US Commercial Space Launch Competitiveness Act of 2015 granted American citizens rights to extract space resources. Luxembourg, UAE and Japan followed with similar laws. The Artemis accords of 2020, which are non-binding arrangements between the US and other countries, have provided for voluntary coordination among like-minded states. They have established principles for lunar activity including transparency and safety zones.

However, they function more as a coalition agreement than a universal law. Clear
international property-rights frameworks would determine which nations capture value. The current state of ambiguity primarily benefits those with clearer frameworks and first-mover advantages, and indicates a missed opportunity for equitable benefit-sharing from space resources.

The pursuit of profit raises paramount scientific and environmental concerns.
Astronomers caution that large-scale mining activities could disrupt ongoing research and preservation of the lunar environment, leading to calls for development of comprehensive lunar laws and regulations to manage these activities responsibly.

Esa’s push for a zero debris charter, which it hopes will gain global recognition by 2030, reflects a growing awareness that mining and resource use in space must go hand in hand with responsible behaviour.

As lunar mining and exploration accelerate, the security dimension also becomes
increasingly complex and fraught, with the potential for conflict between nations. Valuable lunar resources such as water ice and rare metals are concentrated in limited, highly contested regions.

In the absence of internationally binding governance agreements, the risk of overlapping claims, operational interference and even direct confrontation is real. Exclusion zones and safety zones around mining sites could serve as flashpoints for disputes over access, resource rights and commercial interests.

The possibility of competing governance frameworks, such as the Artemis Accords and the Outer Space Treaty, to manage claims could further exacerbate the risk of conflict. The urgent need for international cooperation and transparent, equitable frameworks is clear.

The international community stands at a crossroads. The technology enabling lunar
resource extraction is arriving faster than most anticipated. Policymakers and legislators have a waning opportunity to design and implement governance that keeps pace with innovation and growing appetites for lunar resources.

Binding international agreements – particularly between the great space powers – which emphasise principles of stewardship, clarify access rights and support common benefits from lunar development would ensure the Moon becomes a proving ground for the equitable and sustainable development of space.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. The race to mine the Moon is on – and it urgently needs some clear international rules – https://theconversation.com/the-race-to-mine-the-moon-is-on-and-it-urgently-needs-some-clear-international-rules-270943

New cancer therapy brings remission for patients with deadly T-cell leukaemia

Source: The Conversation – UK – By Justin Stebbing, Professor of Biomedical Sciences, Anglia Ruskin University

WikeSandra/Shutterstock.com

A small group of patients with an otherwise incurable form of T‑cell leukaemia have seen their cancer driven into remission by an innovative form of immune therapy.

The treatment uses T-cells – a type of white blood cell – from a healthy donor, re-engineered in the lab to recognise and attack leukaemia cells. Unlike personalised cancer therapies made from each patient’s own cells, these can be prepared in advance as an “off-the-shelf” product and given quickly to people in urgent need.

For families facing a disease that has returned after every standard treatment, a ready-made therapy that can clear leukaemia to undetectable levels is a major step forward. The latest results of the first 11 patients, treated at Great Ormond Street and King’s College Hospital, have just been published in the New England Journal of Medicine.

The scientific trick here is particularly clever. In T‑cell leukaemia, the cancer itself is made of T-cells, so simply adding more T-cells from outside would normally cause friendly fire: the therapeutic cells would attack each other as well as the cancer or be rejected by the patient’s immune system. By using gene‑editing tools, researchers have switched off or altered key molecules on the donor T-cells so that they can slip past the patient’s immune defences and focus their attack on the leukaemia cells.

In early studies, some patients with no remaining treatment options achieved deep remissions, where even sensitive tests could no longer detect leukaemia. This then opened the door to a stem cell or bone marrow transplant from a donor, which remains the only realistic route to a long‑term cure for these patients.

T-cells explained.

Nuance lost in the media coverage

For the non-expert, it is tempting to see headlines about “reversing incurable cancer” and assume this is a magic bullet that will soon replace chemotherapy or radiotherapy. The truth is both more modest and, in some ways, more impressive.

This treatment is not designed to be the first thing given to every person with leukaemia. It is a specialist option for the few whose cancer has resisted or returned after standard treatments. In that setting, where the alternative may be palliative care alone, having an extra step on the ladder – one more line of defence – can be life changing, even if it is not perfect.

Another point often lost in media coverage is that this therapy is a bridge, not a destination. In the reported cases, the goal was to reduce the cancer burden enough to make a stem cell transplant feasible.

The engineered T-cells are not expected to provide lifelong control by themselves. Instead, they act as a very powerful but temporary strike against the leukaemia, buying time for the patient to receive a transplant, which can then rebuild a healthy immune and blood‑forming system.

That combined strategy – intensive but time‑limited immune therapy, followed by transplant – is what offers a realistic chance of long‑term survival for some of these patients.

Here, life after such treatment is rarely straightforward. A stem cell or bone marrow transplant can save a life, but it is also one of the most demanding procedures in modern medicine. In the months afterwards, patients are at high risk of serious infections, because their new immune system is still immature and may also be suppressed by drugs used to prevent rejection.

Many people experience profound fatigue, weight loss and emotional distress. A significant number spend repeated spells in hospital coping with complications such as graft‑versus‑host disease, where the donor immune cells attack the patient’s own tissues.

Even years later, survivors may live with chronic skin, gut or liver problems, hormonal changes, fertility issues, or the psychological impact of prolonged illness and uncertainty.

From that perspective, it is important not to present this new T‑cell treatment as a simple one‑time cure, after which life instantly returns to normal. For some patients in the New England Journal of Medicine “case series” (a report on a small set of patients), the therapy was part of a long, difficult journey that had already included multiple rounds of chemotherapy and hospital admissions.

Adding an experimental immune therapy and then a transplant increases both the chances of survival and the complexity of aftercare. After treatment, care isn’t just about checking whether the leukaemia has returned. Patients often need lifelong monitoring for late effects, vaccinations to retrain their new immune systems, and support with returning to work, study and family life.

A transformation hard to overstate

At the same time, for those people and their families, the gains are immense. To walk out of hospital after being told that nothing more could be done, and then later hear the words “no evidence of leukaemia”, is a transformation that is hard to overstate.

Parents describe seeing their children go back to school or play sport. Adults talk about being able to plan a holiday or think about the future again. These very human milestones embody the promise of the science far more clearly than any technical description of gene editing or immune receptors. Yet they rest on decades of painstaking lab work, safety testing and thoughtful choices by doctors, and on patients and families willing to take part in experimental treatments when the outcome is uncertain.

There is also a wider significance beyond this particular leukaemia. If donor‑derived, gene‑edited T-cells can be made safe and effective for one rare and aggressive cancer, the same concept might be adapted for other blood cancers or even some solid tumours.

An off‑the‑shelf cell therapy that can be stored, shipped and given in many hospitals could be far more accessible than bespoke therapies that rely on each patient’s own cells, which are complex and slow to manufacture. That said, scaling up production, ensuring the cells are available equitably, and managing the costs will be major challenges for health systems.

So, where does that leave the public trying to interpret dramatic headlines? It helps to hold two ideas in mind at once. First, this is an extraordinary scientific and clinical achievement for a group of patients who had very few options left, offering real hope where previously there was almost none. Second, it is not a universal cure, and it comes at the price of intense treatment and long‑term follow‑up.

The most honest way to describe it is as an extra lifeline for some people in very specific circumstances – a powerful new tool added to an existing toolbox, not the end of cancer as we know it. That may sound less dramatic than “reversing the incurable”, but for the families involved, it can mean everything.

The Conversation

Justin Stebbing does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. New cancer therapy brings remission for patients with deadly T-cell leukaemia – https://theconversation.com/new-cancer-therapy-brings-remission-for-patients-with-deadly-t-cell-leukaemia-271643

What Labour’s migration reforms mean for LGBTQ+ asylum seekers

Source: The Conversation – UK – By Diego Garcia Rodriguez, Leverhulme Research Fellow, Faculty of Social Sciences, University of Nottingham

Gwoeii/Shutterstock

The UK government’s recently-announced plan to overhaul the asylum system rests on the idea that protection for refugees should be temporary and subject to regular review.

Currently, refugees are usually granted five years’ permission to stay, after which they can apply for settlement (indefinite leave to remain). Under the new proposals, recognised refugees would first receive “core protection” – 30 months’ leave, renewable after review. The government is also proposing a system that would make some people wait 20 years for settlement.

Like in Norway and Denmark, the UK is proposing allowing refugee status to be revoked and people deported if their country of origin is deemed to have become “safe”. In 2021, Denmark judged parts of Syria safe to return to and revoked or refused renewals for hundreds of Syrians, even as charities warned that returnees still faced serious risk.

For LGBTQ+ people, these plans present particular risks that could undermine their safety and ability to live openly.

Home Office data shows that, in 2023, 1,377 asylum claims (2% of the total) included sexual orientation as part of the basis for asylum. Equivalent gender identity statistics are not available.

For these asylum seekers, “safety” does not switch on when their countries’ laws change or a conflict stops. States can look stable on paper while people remain unsafe in their family homes, neighbourhoods, workplaces and at police stations.

The Home Office uses its official guidance about countries to evaluate whether it would be “safe” to return someone. It also might refer to relevant case law from the Upper Tribunal, a UK court that deals with immigration and asylum cases.

Some nationalities are treated as coming from “designated” safe states under British law, which can affect how asylum claims are processed. LGBTQ+ asylum charities have argued that countries are sometimes deemed safe even when they are dangerous for LGBTQ+ people.

Asylum seekers waving out of the window of a hotel in London.
The UK wants to end the use of hotels to house asylum seekers.
BalochLenses/Shutterstock

In my research, I have encountered such examples. For example, I have met LGBTQ+ Namibians whose asylum claims were rejected after Namibia’s supreme court recognised foreign same-sex marriages (though same-sex marriage is still not legal in the country), despite evidence of well-founded fear of persecution and a lack of state protection.

My research interlocutors from countries labelled “safe” emphasised the differences between official “safety” and everyday threats. An Indian lesbian woman explained: “Being who I am in India, I wouldn’t be safe there, that’s why I left after my family started to threaten me.”

A lesbian woman speaking from Brazil, where she was deported from the UK after initially fleeing due to violent threats, said: “People think Brazil is safe, but it’s not, and you’re lucky to be alive if you’re LGBT here … It’s not about it being legal or illegal, you need to look at real life, what’s going on with people around you, churches, your boss.”

Both global and local non-profit organisations that support LGBTQ+ people have recorded high levels of violent deaths of LGBTQ+ people in Brazil, including the most killings of trans people in any country for 18 consecutive years.

The UN refugee agency has warned that misusing “safe country” concepts risks breaching the principle of non-refoulement: the duty not to return someone to persecution.

Under the UK’s asylum proposals, once a country is declared safe, refugees seeking to remain in the UK would have to prove that it would be dangerous for them to return.

If the possibility of being deported remains for 20 years, many will plan for life back under secrecy and return to the “closet” to stay safe. This may complicate their asylum applications, as the Home Office expects that claimants live “openly” as LGBTQ+ when assessing their applications.




Read more:
Many people think it’s impossible to be LGBTQ+ and religious – this ‘homosecularism’ is dangerous for asylum seekers


Increased precarity

LGBTQ+ claimants tend to have thin safety nets. Family support is often absent because relatives are part of their persecution. While other claimants lean on organisations linked to their ethnic communities, I have found in my work that many LGBTQ+ people avoid them due to fear of stigma or violence.

A lesbian Nigerian woman told me that staff at a community organisation described same-sex relationships as something to “cast out”. Another said: “Not all people are going to accept you as you are”. This does not mean the UK is not welcoming or safe. Many asylum seekers have found support in LGBTQ+ organisations, inclusive churches and wider community spaces.

Additionally, the government’s plans to remove its obligation to provide accommodation and support for asylum seekers could make their situations more precarious – leading to homelessness, exploitative “sofa surfing” and risky survival strategies.

A fair asylum system should not declare whether a country is “safe” but, instead, assess whether an asylum seeker would be safe if returned there. That is the basic logic of refugee protection under the refugee convention, which says that states must not “expel … a refugee” to a place “where his life or freedom would be threatened”. In the UK, “safe country” lists are a modern policy tool introduced in the late 20th century as part of domestic law.

If Labour’s reforms turn refugee protection into a renewable status, the predictable result is more wrongful returns. This risks establishing a misleading picture of “real” refugees as only those fleeing wars, dismissing queer claimants facing targeted persecution.

The Conversation

Diego Garcia Rodriguez receives funding from the Leverhulme Trust. He is a Research Fellow at the University of Nottingham and a trustee at the LGBTIQ+ asylum charity Time To Be Out.

ref. What Labour’s migration reforms mean for LGBTQ+ asylum seekers – https://theconversation.com/what-labours-migration-reforms-mean-for-lgbtq-asylum-seekers-271239

Driverless taxis are heading to the UK, but it’s still not clear who to blame when something goes wrong

Source: The Conversation – UK – By Paurav Shukla, Professor of Marketing, University of Southampton

Driverless in San Francisco. Tada Images/Shutterstock

Driverless taxis are a bit like buses. You wait ages for one, and then a fleet arrives all at once. The US firms Waymo and Uber have both said their vehicles will be on the streets of London in 2026.

But as this transport technology speeds towards the UK, it seems to be outpacing any widespread agreement over a basic social contract. Robots are due to arrive on British roads without a clear sense of who is responsible when things go wrong.

Imagine you are in the backseat of a driverless taxi, responding to messages on your phone, when suddenly your AI chauffeur crashes into something – or someone. In the silent moments that follow, there is no driver to turn to.

Is the car maker to blame or the programmer who wrote the software? Perhaps it’s the app company that organised the ride. Is it the city authority that permitted the journey, or even you, the passenger, for failing to intervene?

For now, the answer isn’t clear to the public.

Most people don’t know who pays out, or who apologises, when a driverless taxi makes a mistake. And this isn’t just a legal technicality – it is the fault line under a trillion-dollar industry, which could be stopped in its tracks by uncertainty.

Our research reveals that “liability communication” – how companies and authorities explain who is legally in charge and under what conditions – for autonomous vehicles (AVs) is a mess. It is fragmented, riddled with legal jargon and unclear.

This is partly down to the caution with which many western economies – including the US – are approaching AV adoption. In the UK, the government’s pilot scheme is moving ahead slowly.

Others are racing ahead. China, for example, with its high tolerance for experimentation, has created a booming AV ecosystem, with over 32,000km of roads available for AV testing, and 16,000 test licences issued. AV trials have been normalised while legal frameworks are still being drawn up.

But while the UK’s approach may seem sensible, caution without clear communication risks feeding scepticism rather than confidence in the future of driverless cars.

Safety feature

Making the case for safety also needs to be localised. Although enthusiasts highlight millions of safe rides in the US, there’s no point referencing the safety record of AVs in a city built around a grid system that is completely different to the narrow and winding old streets of the UK.

If safety is uncertain, uptake will probably stall, especially in messy streetscapes. And they don’t get much messier than London’s irregular roads.

Uncertainty also brings tension. Some politicians and companies appear fairly bullish, promising a safety revolution and tens of thousands of new jobs. Meanwhile, London’s own taxi trade warns of chaos, citing stalled vehicles, accessibility worries and glaring safety gaps.

London taxi with IHouses of Parliament in background.
Who’s in the driving seat?
Sergii Figurnyi/Shutterstock

Our review shows that this tension is partly to do with poor communication, including gaps in messaging over things like safety and risk, or compensation and complaints. The language apparently aimed at consumers is often ambiguous or overly technical instead of being accessible.

There are other simple steps that UK authorities could take to make things less confusing. One is that every driverless taxi ride should begin with a short, plain-English briefing about who is legally responsible for the journey.




Read more:
‘Robot’ buses could bring more environmental benefits than public transport with drivers


The wording should be composed with consumer groups and accessibility experts, not just lawyers and engineers. And before you even book, the app should explicitly state who insures the vehicle, the software and the ride itself.

A country that gets the communication about AVs wrong will fight every hiccup on social media, at town halls and in the courts. A country that gets it right will turn each minor incident into proof that the system, and the people behind it, are accountable.

To achieve this, liability communication needs to be treated as a safety feature, not a legal footnote. Only then will people be able to truly benefit from the AV promise of cleaner, safer, accessible urban mobility. But the wording needs to be designed for general consumers, not lawyers. Without this, AV adoption risks becoming a slow-motion pile-up.

The Conversation

Paurav Shukla received funding from Trustworthy Autonomous Systems Programme, funded by the UKRI Strategic Priorities Fund.

Tugra Akarsu does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Driverless taxis are heading to the UK, but it’s still not clear who to blame when something goes wrong – https://theconversation.com/driverless-taxis-are-heading-to-the-uk-but-its-still-not-clear-who-to-blame-when-something-goes-wrong-269233

​From head to mistletoe: the curious biology of elves

Source: The Conversation – UK – By Michelle Spear, Professor of Anatomy, University of Bristol

Roman Samborskyi/Shutterstock.com

As Christmas Eve draws near, we’re reminded of the tireless elves behind the scenes, toiling in workshops to bring festive magic to life.

Imagine Santa’s elves not as fantasy figures but as highly adapted beings designed for the unique demands of their world. From enhanced resilience to happy hormones and efficient energy production, each adapted anatomical feature serves a purpose, allowing them to work joyfully, and without pause, in a cold climate that would challenge the rest of us.

Through the lens of this imagined elf, we take a look at general anatomy, using scientific principles and a nod to the Will Ferrell movie Elf to fill in some of the festive details.

Ho-ho-hormones

The remarkable cheer and endurance of an elf can be attributed to a finely tuned endocrine system that supports both their emotional resilience and energy needs.

Their pituitary glands probably produce high baseline levels of serotonin and endorphins – often called “feel-good hormones” – helping them maintain a naturally cheerful disposition even under the pressures of Christmas deadlines.

Beyond individual happiness, elves surely must thrive on teamwork in the workshop. An elevated capacity to release oxytocin, the “bonding hormone”, helps foster strong social connections, promoting a collaborative and harmonious working environment.

With extra oxytocin receptors in the brain, elves would quickly form bonds with each other, boosting morale and creating a positive atmosphere that is crucial for high-stress, close-quarters work. Also essential for good elf and safety.

Presumably, elves would require adaptable sleep patterns to handle the long hours leading up to Christmas. Their pineal glands could produce a specialised form of melatonin, allowing them to reset their internal clocks on demand.

This adaptation would support both sustained alertness during extended shifts and quick recovery naps, keeping them fresh and focused throughout the season.

Good skin and elf care

In the north pole’s long winters, elves may rely on their skin’s heightened ability to synthesise vitamin D even in low-light conditions. This helps regulate mood and energy by supporting serotonin production, which promotes emotional stability, and enhancing mitochondrial function for efficient energy production.

Their skin might also be rich in melanin that adapts to seasonal light changes, maximising their sunlight absorption without risk of seasonal-affective disorder.

A dark polar night tableau.
Elves’ skin is perfectly adapted to dark polar nights.
Esa Ylisuvanto/Shutterstock.com

Sugar and spice

The elf digestive system is probably optimised for processing high-carbohydrate, high-sugar diets without succumbing to the energy crashes humans might experience.

To thrive on a diet rich in sweets, elves would rely on high levels of sucrase, maltase and amylase — enzymes that break down sugars and starches quickly. This enzymatic boost allows for rapid glucose release, sustaining their energy without the usual sugar crash, and keeping them fuelled for long hours in the workshop.

Elves’ livers could also play a crucial role, storing vast reserves of glycogen for quick energy release when needed, especially during the busiest days of the festive season. Their small intestines might boast enhanced villi – tiny, finger-like projections that line the gut – increasing the surface area for nutrient absorption and ensuring every candy cane is put to good use.

Elves might have highly efficient mitochondria – the tiny powerhouses inside cells that convert food into energy – allowing them to produce energy from nutrients more effectively. This could keep their energy levels steady without sharp crashes, helping them remain upbeat and active throughout their lengthy work shifts.

Cold comfort

Thriving in the subzero temperatures of the north pole requires more than a good set of thermals. Elves’ circulatory systems probably feature counter-current heat exchange mechanisms – where warm blood flowing out heats up cold blood coming back in – similar to those found in penguins’ feet and human testicles, to minimise heat loss in extremities. Blood vessels in their hands and feet would work in tandem to recycle warmth.

Elf respiratory systems are equally impressive, designed to maximise oxygen intake in cold, thin air. With larger-than-average nasal cavities lined with specialised mucous membranes, elves can warm and humidify incoming air, protecting their lungs from the frigid environment.

Hear comes Santa Claus

Acute hearing would be essential for quality control and ensuring every toy meets Santa’s exacting standards.

In a bustling workshop, elves need heightened sensory abilities to stay on task. Their ears, already iconic, might also feature internal adaptations – enhanced auditory canals for picking up subtle sounds.

Elf eyes, adapted for the low-light conditions of the winter months, would probably boast a high density of rod cells – the light-sensitive cells in the retina that help us see in darkness – allowing them to see clearly even during the longest polar nights. Perhaps they’ve also evolved a reflective layer behind the retina, similar to a cat’s tapetum lucidum, giving them a distinctive twinkle and ensuring no detail escapes their gaze.

Sleighing it

An elf’s musculoskeletal system would need to be both robust and specialised for the physical demands of their job. Working long hours crafting toys requires dexterous hands supported by flexible yet strong finger joints, enhanced by tendons and ligaments adapted to repetitive tasks. To avoid the perils of repetitive strain injuries, elves might have increased collagen production, keeping their joints supple and resilient.

With an optimised ratio of fast-twitch muscle fibres (for quick movements) and slow-twitch fibres (for endurance), elves would be perfectly suited for bursts of energy and sustained activity alike, ensuring they can switch seamlessly between nimble toy-making and the occasional snowball fight.

So this Christmas, as you admire the handiwork of Santa’s helpers, spare a thought for the ingenious anatomical adaptations that make the merry work of elves possible.

The Conversation

Michelle Spear does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. ​From head to mistletoe: the curious biology of elves – https://theconversation.com/from-head-to-mistletoe-the-curious-biology-of-elves-269155

Europe must reject Trump’s nonsense accusations of ‘civilizational erasure’ – but it urgently needs a strategy of its own

Source: The Conversation – UK – By Francesco Grillo, Academic Fellow, Department of Social and Political Sciences, Bocconi University

European leaders must agree on how to respond to the accusation that their continent faces “civilizational erasure”. These were the strongest words used in the most strongly-worded national security strategy ever released by a US government, making it clear that allyship is no longer a given.

And yet, what exactly does “civilizational erasure” mean? The term seems to come straight out of science fiction and deserves qualification. What kind of civilisation is being erased?

The document released by the US government explicitly specifies that this is not about economic decline so much as the “values” that make European nations “reliable allies” to the US.

The implication is that the current administration is worried that “life, liberty and the pursuit of happiness” are no longer foundational to Europe as they were to America. In addition, it seems that Trump is worried that migration is the cause of this problem.

This is curious. As far as “freedom of speech” and “political liberty” go, even the ranking published annually by the hyper libertarian Washington-based Cato Institute acknowledges that six of the top ten most free countries of the world are from the EU. In contrast, the US is tied with the UK at number 17.

The evidence on being “happy” is even worse for Americans (they are ranked 24th by Gallup) and even better for Europeans (four of the top five happiest nations in the world seem to be in the EU, and the fifth is Iceland).

Perhaps the most dangerous symptom of civilizational decline is apparent when we consider the parameter of the ability to pursue “life”. According to the OECD, in 2024, the US spent more on health than any other country per person at over U$12,000 (£9,000) per year (Switzerland, in a distant second place, at US$8,000). Yet Americans’ life expectancy is six years less on average than Europeans’.

Last but not least, migration. The US government seems concerned that too many immigrants will make Europe unrecognisable, but it is the United States that hosts the largest number of first or second-generation immigrants (including Donald Trump, whose mother and four grandparents were all born in Europe). The security strategy’s diagnosis seems oddly oblivious to the role migrants played in building American success.

How should Europe respond?

It is, thus, difficult to see how Europe is being erased. It is nevertheless true that Europe has a problem. Whereas the US has a strategy, Europeans are very far from even agreeing on what their own interests are.

As wrong as the US may be to attempt to establish a strategy on Europe’s behalf, this lack of vision makes it increasingly unsustainable for Europe to remain one of the best places to be born or to live.

Three messages stand out clearly from the strategy. First, the US does not want to be the world’s sheriff and is not going to pay to stabilise the world. There is even the implication here that the US is happy for the world to be divided into cold war-style “areas of influence”.

Second, the US now believes it is a mistake to think exporting democracy or liberalism maximises the chance of world peace and will no longer pursue this agenda. Third, the US believes that nation states are the cornerstone of any possible world order and that multilateralism (a notion encompassing a diverse range of institutions from the UN to the EU) is undermining that.

While Europe does not need to agree on these assertions, it can use each of the three US points to come up with a response.

Friedrich Merz, Keir Starmer,  Volodymyr Zelenskyy and Emmanuel Macron sitting in front of their national flags.
European leaders gathered in London to discuss the path ahead after the US published its security strategy.
Flickr/Number 10, CC BY-NC-ND

It should, for example, be relatively happy to fill the gap left by US retreat. This would see Europe equipping itself to contribute to stability in Europe, North Africa and the Middle East. Europe should probably also acknowledge that the Americans have a point when they say that “exporting democracy” does not necessarily buy peace.

Second, Europe can even agree with the US that “exporting” institutions and market regulations is complicated and not effective. We must simply focus on protecting human rights as much as possible, without asking other countries to imitate our model.

Third, and most important, it is true that international organisations are not working. But Europeans should answer US rhetoric not by going back to small nation states (as the security strategy suggests) but by assuming the leadership of a radical reform of multilateralism.

The international organisations that Trump has criticised, must rapidly become more capable of delivering solutions efficiently. This must include the EU because it’s obvious that any kind of strategy cannot be led by 27 individual nations working separately.

European civilization is not imploding. It is, however, true that such a civilization requires financial, political and defence resources. These were once bought cheaply from allies who no longer wish to subsidise Europe’s way of life.

It is time for a European security strategy. And one whose message, in a nutshell, is that Europeans are ready to lead and thrive in the changed geopolitcal climate of the 21st century.

The Conversation

Francesco Grillo is affiliated with Vision, the think tank,

ref. Europe must reject Trump’s nonsense accusations of ‘civilizational erasure’ – but it urgently needs a strategy of its own – https://theconversation.com/europe-must-reject-trumps-nonsense-accusations-of-civilizational-erasure-but-it-urgently-needs-a-strategy-of-its-own-271763

Farmers and supermarkets worry that extreme weather will stop food getting to consumers – here’s what needs to change

Source: The Conversation – UK – By Mohammed F. Alzuhair, Doctor of Business Administration Candidate and Researcher, Durham University

www.hollandfoto.net/Shutterstock

Storm Amy with its gusts of nearly 100mph brought heavy rain, fallen trees, and transport disruption across parts of the UK in October. Shortly after, a cold spell brought frost risks in several areas. The shift from flooding to frost showed how quickly farmers’ access to fields, harvesting and transport can be disrupted.

It also revealed how heavily the food chain depends on clear, connected information when conditions change suddenly. Without improvements, in this type of extreme weather, supermarkets risk running short of food.

Extreme weather, like the floods and high winds of Storm Bram on December 9, is reshaping UK farming. A recent survey found that 87% of farmers have seen lower productivity because of droughts, floods or heatwaves, and major retailers now link higher food prices to weather-related harvest losses.

A recent UK assessment of resilience in the systems delivering food from farms to shops also identifies how much pressure severe weather places on production and transport.

Storm Amy exposed that clearly. It left fields too muddy for machinery and blocked rural access roads in several areas. Harvesting was paused and collections rescheduled because vehicles could not operate safely or reach farms by normal routes.

When many farms face the same conditions at once, produce reaches distribution centres later and waste risks rise. The storm illustrated how quickly weather can unsettle the flow of food, and how much depends on clear, connected information when conditions shift suddenly.

How information moves through the system is important. Farmers may know frost is coming, but not whether access roads are open nearby, whether rivers are rising in their region, or whether retailers are shifting collection times. Each part of the chain acts on its own information, so decisions are made later than they need to be.

A shared early-warning system could change that by giving farmers, retailers and public agencies (such as local authorities) the same practical signals at the same time. Information about soil conditions, water availability, severe-weather alerts and access, could help the food system can adjust earlier and avoid possible food shortages.

Food is already classified as part of the UK’s critical national infrastructure, meaning disruptions can affect essential services. Projections from the Met Office, the UK’s weather and climate science agency, suggest Britain will face hotter, drier summers and warmer, wetter winters.

They also warn of more frequent extreme events. Even as intense rain falls in some areas, reservoirs in parts of south-east England are entering winter below typical levels, showing how uneven rainfall can leave soils saturated while water storage remains tight.

The rapid shift from heavy rain to colder conditions illustrates what the Met Office describes as compound events – hazards arriving close together that can cause greater disruption than either would on their own. For farmers, this can mean managing soaked ground one day and protecting crops from frost the next, all while keeping collections and deliveries on track.

How Storm Amy affected one farmer.

Data that doesn’t connect

Farmers already monitor soil moisture, field conditions and crop status. Public agencies track rainfall, river levels and flood alerts. Retailers have complicated systems that include transport networks and assessing expected demand. But these numbers sit in different systems, often using different formats, making them difficult to bring together quickly.

At its core, this is a problem of systems not being able to talk to each other when it matters. Work on the food data transparency partnership (which brings together views from government departments and industry) highlights the need for common standards.

Technical groups make the same point – that inconsistent formats and definitions prevent organisations from forming a clear shared view of what is happening on the ground.

Each set of data helps in isolation; the difficulty is that they are not easily viewed together.




Read more:
The UK’s food supply is more fragile than you might think – here’s why it should be a national priority


Supermarkets want change too

In November, Tesco’s UK chief executive, Ashwin Prasad, called for a national framework for farm data, noting that 96% of farmers say inconsistent standards make planning harder. When both the UK’s largest retailer and its suppliers highlight the same barrier, it suggests a deeper, system-wide issue rather than an isolated concern.

Government plans for revising its agricultural policy is starting to acknowledge these issues. There are pilot schemes testing the use of shared environmental data on farms. And the food data transparency partnership is working on more consistent data rules. These efforts are important foundations, but recent events show that more practical, real-time coordination is still needed, especially in emergencies.

Public agencies hold information that no other part of the system can access: regional transport pressures, infrastructure constraints and emergency responsibilities. They are also required to assess climate-related risks under government reporting standards which will start to be introduced in 2026. These assessments depend on accurate, timely data, something that becomes far harder to provide when information is fragmented.

With clearer and more connected information, government bodies could identify which rural roads matter most for moving perishable goods, direct targeted support to farmers when severe weather threatens crops, spot pressure points when multiple regions face disruption, and plan long-term investments in flood management, soil health and water resources.

Why early-warning systems are needed

The UK already has many of the components needed for a modern, connected food-information system, detailed monitoring on farms themselves, national forecasting and sophisticated retail logistics. The priority now is to bring these parts together.

A shared early-warning layer could make a difference. It would not replace existing tools or farmers’ experience, but provide a small set of common signals, soil conditions, water availability, severe-weather alerts and key access-route issues, available to everyone at the same time. To work in practice, it must also ensure that farmers retain clear control over how their data is used so that trust and coordination develop together.

A recent survey found that more than 80% of UK farmers are worried that climate change is “harming their livelihoods”. That sense of pressure underlines the need for systems that help farmers prepare earlier and respond more confidently when conditions change.

Better, more connected data is one of the simplest ways to offer that support, and to help keep food moving smoothly as British weather becomes increasingly unpredictable.


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The Conversation

Mohammed F. Alzuhair does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Farmers and supermarkets worry that extreme weather will stop food getting to consumers – here’s what needs to change – https://theconversation.com/farmers-and-supermarkets-worry-that-extreme-weather-will-stop-food-getting-to-consumers-heres-what-needs-to-change-270924

L’Australie interdit les réseaux sociaux aux moins de 16 ans : un modèle bientôt suivi par d’autres pays ?

Source: The Conversation – France in French (3) – By Lisa M. Given, Professor of Information Sciences & Director, Social Change Enabling Impact Platform, RMIT University

L’accès aux réseaux sociaux doit-il être restreint jusqu’à un âge donné, et si oui, jusqu’à quel âge, et comment exactement ?
Sanket Mishra/Unsplash

C’est le résultat de plusieurs années de campagne du gouvernement australien et de parents d’enfants victimes de harcèlement en ligne : l’entrée en vigueur d’une loi interdisant les réseaux sociaux aux moins de 16 ans. Des applications telles qu’Instagram, Snapchat, X, Facebook ou encore Reddit sont désormais soumises à l’obligation de bannir tous les utilisateurs de moins de 16 ans sous peine d’amendes. Si cette loi soulève de nombreuses questions sur son efficacité réelle et ses modalités de mise en œuvre, et si d’autres pays privilégient des mesures moins contraignantes, le texte n’en constitue pas moins une première mondiale et suscite un intérêt à l’international. Affaire à suivre…


Après des mois d’attente et de débats, la loi sur les réseaux sociaux en Australie est désormais en vigueur. Les Australiens de moins de 16 ans doivent désormais composer avec cette nouvelle réalité qui leur interdit d’avoir un compte sur certaines plates-formes de réseaux sociaux, notamment Instagram, TikTok et Facebook.

Seul le temps dira si cette expérience audacieuse, une première mondiale, sera couronnée de succès. En attendant, de nombreux pays envisagent déjà de suivre l’exemple de l’Australie, tandis que d’autres adoptent une approche différente pour tenter d’assurer la sécurité des jeunes en ligne.

Un mouvement global

En novembre, le Parlement européen a appelé à l’adoption d’une interdiction similaire des réseaux sociaux pour les moins de 16 ans.

La présidente de la Commission européenne, Ursula von der Leyen, a déclaré qu’elle avait étudié les restrictions australiennes et la manière dont elles traitent ce qu’elle a qualifié d’« algorithmes qui exploitent la vulnérabilité des enfants », laissant les parents impuissants face au « tsunami des big tech qui envahit leurs foyers ».

En octobre, la Nouvelle-Zélande a annoncé qu’elle allait introduire une législation similaire à celle de l’Australie, à la suite des travaux d’une commission parlementaire chargée d’examiner la meilleure façon de lutter contre les dommages causés par les réseaux sociaux. Le rapport de la commission sera publié début 2026.

Le Pakistan et l’Inde visent à réduire l’exposition des enfants à des contenus susceptibles de leur porter préjudice, en introduisant des règles exigeant l’accord parental et la vérification de l’âge pour accéder aux réseaux sociaux, ainsi que des exigences en matière de modération adressées aux plates-formes.

La Malaisie a annoncé qu’elle interdirait l’accès aux réseaux sociaux aux enfants de moins de 16 ans à partir de 2026. Cette mesure s’inscrit dans la continuité de l’obligation imposée à partir de janvier 2025 aux réseaux sociaux et aux plates-formes de messagerie comptant au moins huit millions d’utilisateurs d’obtenir une licence d’exploitation et de mettre en place des mesures de vérification de l’âge et de sécurité des contenus.

De son côté, la France envisage d’interdire les réseaux sociaux aux moins de 15 ans et d’imposer un couvre-feu de 22 h à 8 h pour l’utilisation des plates-formes aux 15-18 ans. Ces mesures font partie des recommandations formulées par une commission d’enquête française en septembre 2025, qui a également prescrit d’interdire les smartphones à l’école et d’instaurer un délit de « négligence numérique pour les parents qui ne protègent pas leurs enfants ».

En 2023, la France a promulgué une loi contraignant les plates-formes à obtenir l’accord des parents des enfants de moins de 15 ans pour que ces derniers puissent créer un compte sur les réseaux sociaux. Pour autant, cette mesure n’a pas encore été mise en application. C’est également le cas en Allemagne : dans ce pays, les enfants âgés de 13 à 16 ans ne peuvent accéder aux plates-formes qu’avec l’accord de leurs parents, mais dans les faits, aucun contrôle réel n’est exercé.

En Espagne, l’âge minimum pour créer un compte sur les réseaux sociaux passera de 14 ans actuellement à 16 ans. Les moins de 16 ans pourront tout de même créer un compte à la condition expresse d’avoir l’accord de leurs parents.

La Norvège a annoncé en juillet son intention de restreindre l’accès aux réseaux sociaux pour les moins de 15 ans. Le gouvernement a expliqué que la loi serait « conçue dans le respect des droits fondamentaux des enfants, notamment la liberté d’expression, l’accès à l’information et le droit d’association ».

En novembre, le Danemark a annoncé souhaiter « l’interdiction de l’accès aux réseaux sociaux à toute personne âgée de moins de 15 ans ». Cependant, contrairement à la législation australienne, les parents peuvent passer outre ces règles afin de permettre aux enfants âgés de 13 et 14 ans de conserver leur accès à ces plates-formes. Toutefois, aucune date de mise en œuvre n’a été fixée et l’adoption du texte par les législateurs devrait prendre plusieurs mois. On ignore la façon dont l’interdiction danoise sera appliquée. Mais le pays dispose d’un programme national d’identification numérique qui pourrait être utilisé à cette fin.

En juillet, le Danemark a été sélectionné pour participer à un programme pilote (avec la Grèce, la France, l’Espagne et l’Italie) visant à tester une application de vérification de l’âge qui pourrait être lancée dans toute l’Union européenne à l’intention des sites pour adultes et d’autres fournisseurs de services numériques.

Une femme aux cheveux blonds portant un blazer blanc
La présidente de la Commission européenne, Ursula von der Leyen, étudie les restrictions imposées par l’Australie sur les réseaux sociaux. L’Union européenne pourrait suivre l’exemple de l’Australie.
Wikimedia, CC BY

Des résistances

Pour autant, ce type de restrictions n’est pas appliqué partout dans le monde.

Par exemple, la Corée du Sud a décidé de ne pas adopter une interdiction des réseaux sociaux pour les enfants. Mais elle interdira l’utilisation des téléphones portables et autres appareils dans les salles de classe à partir de mars 2026.

Dans la ville de Toyoake (au sud-ouest de Tokyo, au Japon), une solution très différente a été proposée. Le maire de la ville, Masafumi Koki, a publié en octobre une ordonnance limitant l’utilisation des smartphones, tablettes et ordinateurs à deux heures par jour pour les personnes de tous âges.

Koki est informé des restrictions imposées par l’Australie en matière de réseaux sociaux. Mais comme il l’a expliqué :

« Si les adultes ne sont pas tenus de respecter les mêmes normes, les enfants n’accepteront pas les règles. »

Bien que l’ordonnance ait suscité des réactions négatives et ne soit pas pas contraignante, elle a incité 40 % des habitants à réfléchir à leur comportement, et 10 % d’entre eux ont réduit le temps passé sur leur smartphone.

Aux États-Unis, l’opposition aux restrictions imposées par l’Australie sur les réseaux sociaux a été extrêmement virulente et significative.

Les médias et les plateformes états-uniens ont exhorté le président Donald Trump à « réprimander » l’Australie au sujet de sa législation. Ils affirment que les entreprises états-uniennes sont injustement visées et ont déposé des plaintes officielles auprès du Bureau américain du commerce.

Le président Trump a déclaré qu’il s’opposerait à tout pays qui « attaquerait » les plates-formes états-uniennes. Les États-Unis ont récemment convoqué la commissaire australienne à la sécurité électronique Julie Inman-Grant pour témoigner devant le Congrès. Le représentant républicain Jim Jordan a affirmé que l’application de la loi australienne sur la sécurité en ligne « impose des obligations aux entreprises américaines et menace la liberté d’expression des citoyens américains », ce que Mme Inman-Grant a fermement nié.

Maintien de la vigilance mondiale

Alors que la plupart des pays semblent s’accorder sur les préoccupations liées au fonctionnement des algorithmes et aux contenus néfastes auxquels les enfants sont exposés sur les réseaux sociaux, une seule chose est claire : il n’existe pas de solution miracle pour remédier à ces problèmes.

Il n’existe pas de restrictions faisant consensus ni d’âge spécifique à partir duquel les législateurs s’accorderaient à dire que les enfants devraient avoir un accès illimité à ces plates-formes.

De nombreux pays en dehors de l’Australie donnent aux parents la possibilité d’autoriser l’accès à Internet s’ils estiment que cela est dans l’intérêt de leurs enfants. Et de nombreux pays réfléchissent à la meilleure façon d’appliquer les restrictions, s’ils mettent en place des règles similaires.

Alors que les experts soulignent les difficultés techniques liées à l’application des restrictions australiennes, et que les jeunes Australiens envisagent des solutions de contournement pour conserver leurs comptes ou trouver de nouvelles plates-formes à utiliser, d’autres pays continueront à observer et à planifier leurs prochaines actions.

The Conversation

Lisa M. Given a reçu des financements de l’Australian Research Council et de l’eSafety Commission australienne. Elle est membre de l’Académie des sciences sociales d’Australie et de l’Association for Information Science and Technology.

ref. L’Australie interdit les réseaux sociaux aux moins de 16 ans : un modèle bientôt suivi par d’autres pays ? – https://theconversation.com/laustralie-interdit-les-reseaux-sociaux-aux-moins-de-16-ans-un-modele-bientot-suivi-par-dautres-pays-271774

Aliments ultratransformés : quels effets sur notre santé et comment réduire notre exposition ?

Source: The Conversation – in French – By Mathilde Touvier, Directrice de l’Equipe de Recherche en Epidémiologie Nutritionnelle, U1153 Inserm,Inrae, Cnam, Université Sorbonne Paris Nord, Université Paris Cité, Université Paris Cité

Souvent trop sucrés, trop salés et trop caloriques, les aliments ultratransformés contiennent en outre de nombreux additifs, arômes et autres substances résultant de leurs modes de fabrication industriels. Or, les preuves des liens entre leur consommation et divers troubles de santé s’accumulent. Le point sur l’état des connaissances.


The Kraft Heinz Company, Mondelez International, Post Holdings, The Coca-Cola Company, PepsiCo, General Mills, Nestlé USA, Kellogg’s, Mars Incorporated et Conagra Brands… au-delà de leur secteur d’activité – l’agroalimentaire – et de leur importance économique, ces dix entreprises partagent désormais un autre point commun : elles sont toutes visées par une procédure judiciaire engagée par la Ville de San Francisco, aux États-Unis. Selon le communiqué de presse publié par les services du procureur de la ville David Chiu, cette plainte est déposée, car

ces sociétés « savai[en]t que [leurs] produits rendaient les gens malades, mais [ont] continué à concevoir et à commercialiser des produits de plus en plus addictifs et nocifs afin de maximiser [leurs] profits ».

Cette procédure survient quelques jours après la publication, dans la revue médicale The Lancet, d’un long dossier consacré aux effets des aliments ultratransformés sur la santé. Parmi les travaux présentés figure l’analyse approfondie de la littérature scientifique disponible sur ce sujet que nous avons réalisée.

Voici ce qu’il faut savoir des conséquences de la consommation de tels aliments, en tenant compte des connaissances les plus récentes sur le sujet.

Qu’appelle-t-on « aliments ultratransformés » ?

À l’heure actuelle, en France, on estime qu’en moyenne de 30 à 35 % des calories consommées quotidiennement par les adultes proviennent d’aliments ultratransformés. Cette proportion peut atteindre 60 % au Royaume-Uni et aux États-Unis. Si dans les pays occidentaux, les ventes de ces produits se sont stabilisées (quoiqu’à des niveaux élevés), elles sont en pleine explosion dans les pays à revenu faible et intermédiaire.

Comme leur nom l’indique, les aliments ultratransformés sont des aliments, ou des formulations issues d’aliments, qui ont subi des transformations importantes lors de leur élaboration. Ils sont fabriqués de façon industrielle, selon une grande diversité de procédés (chauffage à haute température, hydrogénation, prétraitement par friture, hydrolyse, extrusion, etc.) qui modifient radicalement la matrice alimentaire de départ.

Par ailleurs, les aliments ultratransformés sont caractérisés dans leur formulation par la présence de « marqueurs d’ultra-transformation », parmi lesquels les additifs alimentaires destinés à en améliorer l’apparence, le goût ou la texture afin de les rendre plus appétissants et plus attrayants : colorants, émulsifiants, édulcorants, exhausteurs de goût, etc. À l’heure actuelle, 330 additifs alimentaires sont autorisés en France et dans l’Union européenne.

En outre, des ingrédients qui ne sont pas concernés par la réglementation sur les additifs alimentaires entrent aussi dans la composition des aliments ultratransformés. Il s’agit par exemple des arômes, des sirops de glucose ou de fructose, des isolats de protéines, etc.

En raison des processus de transformation qu’ils subissent, ces aliments peuvent également contenir des composés dits « néoformés », qui n’étaient pas présents au départ, et dont certains peuvent avoir des effets sur la santé.

Dernier point, les aliments ultratransformés sont généralement vendus dans des emballages sophistiqués, dans lesquels ils demeurent souvent conservés des jours voire des semaines ou mois. Ils sont aussi parfois réchauffés au four à micro-ondes directement dans leurs barquettes en plastique. De ce fait, ils sont plus susceptibles de contenir des substances provenant desdits emballages.

Les procédés possibles et les additifs autorisés pour modifier les aliments sont nombreux. Face à la profusion d’aliments présents dans les rayons de nos magasins, comment savoir si un aliment appartient à la catégorie des « ultratransformés » ?

Une classification pour indiquer le niveau de transformation

Un bon point de départ pour savoir, en pratique, si un produit entre dans la catégorie des aliments ultratransformés est de se demander s’il contient uniquement des ingrédients que l’on peut trouver traditionnellement dans sa cuisine. Si ce n’est pas le cas (s’il contient par exemple des émulsifiants, ou des huiles hydrogénées, etc.), il y a de fortes chances qu’il s’agisse d’un aliment ultratransformé.

La classification NOVA

Dans les années 2010, le chercheur brésilien Carlos Monteiro et son équipe ont proposé une classification des aliments fondée sur leur degré de transformation. Celle-ci comporte quatre groupes :

  • les aliments pas ou peu transformés ;
  • les ingrédients culinaires (sel, sucre, matières grasses animales et végétales, épices, poivre…) ;
  • les aliments transformés combinant les deux premiers groupes ;
  • les aliments ultratransformés.

Dans le groupe des aliments ultratransformés figurent par exemple les sodas, qu’ils soient sucrés ou édulcorés, les légumes assaisonnés de sauces contenant des additifs alimentaires, les steaks végétaux reconstitués ou les pâtisseries, les confiseries et barres chocolatées avec ajout d’additifs, les nouilles déshydratées instantanées, les yaourts édulcorés…

Saucisses et jambons, qui contiennent des nitrites, sont classés comme « aliments ultratransformés », tandis qu’une viande simplement conservée en salaison est considérée comme des « transformée ». De la même façon, les soupes liquides en brique préparées uniquement avec des légumes, des herbes et des épices sont considérées comme des « aliments transformés », alors que les soupes déshydratées, avec ajout d’émulsifiants ou d’arômes sont classées comme « aliments ultratransformés ».

Des aliments qui contiennent plus de sucre, plus de sel, plus de gras

Les aliments ultratransformés sont en moyenne plus pauvres en fibres et en vitamines que les autres aliments, tout en étant plus denses en énergie et plus riches en sel, en sucre et en acides gras saturés. En outre, ils pousseraient à manger davantage.

De nombreuses études ont également montré que les régimes riches en aliments ultratransformés étaient par ailleurs associés à une plus faible consommation d’aliments nutritionnellement sains et favorables à la santé.

Or, on sait depuis longtemps maintenant que les aliments trop sucrés, trop salés, trop riches en graisses saturées ont des impacts délétères sur la santé s’ils sont consommés en trop grande quantité et fréquence. C’est sur cette dimension fondamentale que renseigne le Nutri-Score.

Il faut toutefois souligner que le fait d’appartenir à la catégorie « aliments ultratransformés » n’est pas systématiquement synonyme de produits riches en sucres, en acides gras saturés et en sel. En effet, la qualité nutritionnelle et l’ultra-transformation/formulation sont deux dimensions complémentaires, et pas colinéaires.

Cependant, depuis quelques années, un nombre croissant de travaux de recherche ont révélé que les aliments ultratransformés ont des effets délétères sur la santé qui ne sont pas uniquement liés à leur qualité nutritionnelle.

Des effets sur la santé avérés, d’autres soupçonnés

Afin de faire le point sur l’état des connaissances, nous avons procédé à une revue systématique de la littérature scientifique sur le sujet. Celle-ci nous a permis d’identifier 104 études épidémiologiques prospectives.

Ce type d’étude consiste à constituer une cohorte de volontaires dont les consommations alimentaires et le mode de vie sont minutieusement renseignés, puis dont l’état de santé est suivi sur le long terme. Certains des membres de la cohorte développent des maladies, et pas d’autres. Les données collectées permettent d’établir les liens entre leurs expositions alimentaires et le risque de développer telle ou telle pathologie, après prise en compte de facteurs qui peuvent « brouiller » ces associations (ce que les épidémiologistes appellent « facteurs de confusion » : tabagisme, activité physique, consommation d’alcool, etc.).

Au total, 92 des 104 études publiées ont observé une association significative entre exposition aux aliments ultratransformés et problèmes de santé.

Les 104 études prospectives ont dans un second temps été incluses dans une méta-analyse (autrement dit, une analyse statistique de ces données déjà publiées), afin d’effectuer un résumé chiffré de ces associations.

Les résultats obtenus indiquent que la mortalité prématurée toutes causes confondues était l’événement de santé associé à la consommation d’aliments transformés pour lequel la densité de preuve était la plus forte (une vingtaine d’études incluses dans la méta-analyse).

Pour le formuler simplement : les gens qui consommaient le plus d’aliments ultratransformés vivaient en général moins longtemps que les autres, toutes choses étant égales par ailleurs en matière d’autres facteurs de risques.

Les preuves sont également solides en ce qui concerne l’augmentation de l’incidence de plusieurs pathologies : maladies cardiovasculaires, obésité, diabète de type 2 et dépression ou symptômes dépressifs.

La méta-analyse suggérait également une association positive entre la consommation d’aliments ultratransformés et le risque de développer une maladie inflammatoire chronique de l’intestin (quatre études incluses).

En ce qui concerne les cancers, notamment le cancer colorectal, les signaux indiquant une corrélation potentielle sont plus faibles. Il faudra donc mener d’autres études pour confirmer ou infirmer le lien.

Des résultats cohérents avec les travaux expérimentaux

Au-delà de ces études de cohorte, ces dernières années, diverses études dites « interventionnelles » ont été menées. Elles consistent à exposer des volontaires à des aliments ultratransformés et un groupe témoin à des aliments pas ou peu transformés, afin de suivre l’évolution de différents marqueurs biologiques (sur une période courte de deux ou trois semaines, afin de ne pas mettre leur santé en danger).

C’est par exemple le cas des travaux menés par Jessica Preston et Romain Barrès, qui ont montré avec leurs collaborateurs que la consommation d’aliments ultratransformés entraînait non seulement une prise de poids plus importante que les aliments non ultratransformés, à calories égales, mais qu’elle perturbait aussi certaines hormones, et était liée à une baisse de la qualité du sperme.

Ces résultats suggèrent que ce type de nourriture serait délétère à la fois pour la santé cardiométabolique et pour la santé reproductive. Les résultats de plusieurs essais randomisés contrôlés menés ces dernières années vont dans le même sens. Cinq ont été répertoriés et décrits dans notre article de revue, et d’autres sont en cours.

Les aliments ultratransformés impactent donc la santé, et ce, très en amont du développement de maladies chroniques comme le diabète.

D’autres travaux expérimentaux, comme ceux de l’équipe de Benoît Chassaing, révèlent que la consommation de certains émulsifiants qui sont aussi des marqueurs d’ultra-transformation perturbe le microbiote. Elle s’accompagne d’une inflammation chronique, et a été associée au développement de cancers colorectaux dans des modèles animaux.




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Rappelons que la majorité des additifs contenus dans les aliments ultratransformés n’ont pas d’intérêt en matière de sécurité sanitaire des aliments. On parle parfois d’additifs « cosmétiques », ce terme n’ayant pas de valeur réglementaire.

Ils servent uniquement à rendre les produits plus appétissants, améliorant leur apparence ou leurs qualités organoleptiques (goût, texture) pour faire en sorte que les consommateurs aient davantage envie de les consommer. Ils permettent aussi de produire à plus bas coût, et d’augmenter les durées de conservation.

Au-delà du principe de précaution

En 2019, à la suite de l’avis du Haut Conseil de la santé publique, le quatrième programme national nutrition santé (PNNS) introduisait pour la première fois la recommandation officielle de favoriser les aliments pas ou peu transformés et limiter les aliments ultratransformés, tels que définis par la classification NOVA.

À l’époque, cette recommandation se fondait sur un nombre relativement restreint de publications, notamment les premières au monde ayant révélé des liens entre aliments ultratransformés et incidence de cancers, maladies cardiovasculaires et diabète de type 2, dans la cohorte française NutriNet-Santé. Il s’agissait donc avant tout d’appliquer le principe de précaution.

Aujourd’hui, les choses sont différentes. Les connaissances accumulées grâce aux nombreuses recherches menées ces cinq dernières années dans le monde ont apporté suffisamment de preuves pour confirmer que la consommation d’aliments ultratransformés pose un réel problème de santé publique.

Dans le cadre de la cohorte NutriNet-Santé, nous avons, par exemple, désormais publié une douzaine d’articles montrant des liens entre la consommation d’émulsifiants, de nitrites, d’édulcorants ainsi que celle de certains mélanges d’additifs et une incidence plus élevée de certains cancers, maladies cardiovasculaires, d’hypertension et de diabète de type 2.

De potentiels « effets cocktails » ont également été suggérés grâce à un design expérimental mis en place par des collègues toxicologues. Des indices collectés lors de travaux toujours en cours suggèrent également que certains colorants et conservateurs pourraient eux aussi s’avérer problématiques. Rappelons en outre qu’en 2023, le Centre international de recherche sur le cancer (CIRC) a classé l’aspartame comme « possiblement cancérigène » pour l’être humain (groupe 2B).

Le problème est que nous sommes exposés à de très nombreuses substances. Or, les données scientifiques concernant leurs effets, notamment sur le long terme ou lorsqu’elles sont en mélange, manquent. Par ailleurs, tout le monde ne réagit pas de la même façon, des facteurs individuels entrant en ligne de compte.

Il est donc urgent que les pouvoirs publics, sur la base des connaissances scientifiques les plus récentes, s’emparent de la question des aliments ultratransformés. Mais par où commencer ?

Quelles mesures prendre ?

Comme souvent en nutrition de santé publique, il est nécessaire d’agir à deux niveaux. Au niveau du consommateur, le cinquième programme national nutrition santé, en cours d’élaboration, devrait pousser encore davantage la recommandation de limiter la consommation d’aliments ultratransformés.

Il s’agira également de renforcer l’éducation à l’alimentation dès le plus jeune âge (et la formation des enseignants et des professionnels de santé) pour sensibiliser les publics à cette question.

En matière d’information des consommateurs, l’étiquetage des denrées alimentaires joue un rôle clé. La première urgence reste de rendre obligatoire le Nutri-Score sur l’ensemble des produits, comme cela est plébiscité par plus de 90 % de la population française, d’après Santé publique France. Les citoyennes et citoyens ont leur rôle à jouer en ce sens, en signant la pétition sur le site de l’Assemblée nationale.

À ce sujet, soulignons que des évolutions du logo Nutri-Score sont envisagées pour mieux renseigner les consommateurs, par exemple en entourant de noir le logo lorsqu’il figure sur des aliments appartenant à la catégorie NOVA « ultratransformé ». Un premier essai randomisé mené sur deux groupes de 10 000 personnes a démontré que les utilisateurs confrontés à un tel logo nutritionnel sont nettement plus à même d’identifier si un produit est ultratransformé, mais également que le Nutri-Score est très performant lorsqu’il s’agit de classer les aliments selon leur profil nutritionnel plus ou moins favorable à la santé.

Il est également fondamental de ne pas faire porter tout le poids de la prévention sur le choix des consommateurs. Des modifications structurelles de l’offre de nos systèmes alimentaires sont nécessaires.

Par exemple, la question de l’interdiction de certains additifs (ou d’une réduction des seuils autorisés), lorsque des signaux épidémiologiques et/ou expérimentaux d’effets délétères s’accumulent, doit être posée dans le cadre de la réévaluation de ces substances par les agences sanitaires. C’est en particulier le cas pour les additifs « cosmétiques » sans bénéfice santé.

Les leviers économiques

Au-delà de la réglementation liée à la composition des aliments ultratransformés, les législateurs disposent d’autres leviers pour en limiter la consommation. Il est par exemple possible de réguler leur marketing et de limiter leur publicité, que ce soit à la télévision, dans l’espace public ou lors des événements sportifs, notamment.

Ce point est d’autant plus important en ce qui concerne les campagnes qui ciblent les enfants et les adolescents, particulièrement vulnérables au marketing. Des tests d’emballage neutre – bien que menés sur de petits effectifs – l’ont notamment mis en évidence.

Autre puissant levier : le prix. À l’instar de ce qui s’est fait dans le domaine de la lutte contre le tabagisme, il pourrait être envisageable de taxer les aliments ultratransformés et ceux avec un Nutri-Score D ou E et, au contraire, de prévoir des systèmes d’incitations économiques pour faire en sorte que les aliments les plus favorables nutritionnellement, pas ou peu ultratransformés, et si possible bio, soient les plus accessibles financièrement et deviennent les choix par défaut.

Il s’agit aussi de protéger les espaces d’éducation et de soin en interdisant la vente ou la distribution d’aliments ultratransformés, et en y améliorant l’offre.

Il est également fondamental de donner les moyens à la recherche académique publique, indemne de conflits d’intérêt économiques, de conduire des études pour évaluer les effets sur la santé des aliments industriels. Ce qui passe par une amélioration de la transparence en matière de composition de ces produits.

Un manque de transparence préjudiciable aux consommateurs

À l’heure actuelle, les doses auxquelles les additifs autorisés sont employés par les industriels ne sont pas publiques. Lorsque les scientifiques souhaitent accéder à ces informations, ils n’ont généralement pas d’autre choix que de faire des dosages dans les matrices alimentaires qu’ils étudient.

C’est un travail long et coûteux : lors de nos travaux sur la cohorte NutriNet-Santé, nous avons dû réaliser des milliers de dosages. Nous avons aussi bénéficié de l’appui d’associations de consommateurs, comme UFC-Que Choisir. Or, il s’agit d’informations essentielles pour qui étudie les impacts de ces produits sur la santé.

Les pouvoirs publics devraient également travailler à améliorer la transparence en matière de composition des aliments ultratransformés, en incitant (ou en contraignant si besoin) les industriels à transmettre les informations sur les doses d’additifs et d’arômes employées, sur les auxiliaires technologiques utilisés, sur la composition des matériaux d’emballages, etc. afin de permettre l’évaluation de leurs impacts sur la santé par la recherche académique.

Cette question de la transparence concerne aussi l’emploi d’auxiliaires technologiques. Ces substances, utilisées durant les étapes de transformation industrielle, ne sont pas censées se retrouver dans les produits finis. Elles ne font donc pas l’objet d’une obligation d’étiquetage. Or, un nombre croissant de travaux de recherche révèle qu’en réalité, une fraction de ces auxiliaires technologiques peut se retrouver dans les aliments.

C’est par exemple le cas de l’hexane, un solvant neurotoxique utilisé dans l’agro-industrie pour améliorer les rendements d’extraction des graines utilisées pour produire les huiles végétales alimentaires.

Le poids des enjeux économiques

Le manque de transparence ne se limite pas aux étiquettes des aliments ultratransformés. Il est également important de vérifier que les experts qui travaillent sur ces sujets n’ont pas de liens d’intérêts avec l’industrie. L’expérience nous a appris que lorsque les enjeux économiques sont élevés, le lobbying – voire la fabrique du doute – sont intenses. Ces pratiques ont été bien documentées dans la lutte contre le tabagisme. Or, les aliments ultratransformés génèrent des sommes considérables.

Enjeux économiques

  • Entre 2009 et 2023, les ventes mondiales sur le marché des aliments ultratransformés sont passées de 1 500 milliards de dollars à 1 900 milliards de dollars (en dollars américains constants de 2023, à prix constants ; soit environ de 1 290 milliards à 1 630 milliards d’euros), principalement tirés par la croissance rapide des ventes dans les pays à faible et moyen revenu ;
  • Entre 1962 et 2021, plus de la moitié des 2 900 milliards de dollars (environ 2 494 milliards d’euros aujourd’hui) versés aux actionnaires par les entreprises opérant dans les secteurs de la production alimentaire, de la transformation, de la fabrication, de la restauration rapide et de la vente au détail, l’ont été par les fabricants de produits ultratransformés.

Cependant, si élevés que soient ces chiffres, les découvertes scientifiques récentes doivent inciter la puissance publique à prendre des mesures qui feront passer la santé des consommateurs avant les intérêts économiques.

Il s’agit là d’une impérieuse nécessité, alors que l’épidémie de maladies chroniques liées à la nutrition s’aggrave, détruit des vies et pèse de plus en plus sur les systèmes de santé.

The Conversation

Mathilde Touvier a reçu des financements publics ou associatifs à but non lucratif de l’European Research Council, l’INCa, l’ANR, la DGS…

Bernard Srour a reçu des financements de l’Agence nationale de la recherche (ANR), de INRAE et de l’Institut national du cancer (INCa) dans le cadre de ses recherches. Il a reçu des honoraria dans le cadre d’expertises ou de présentations scientifiques de la part de l’American Heart Association, l’European School of Oncology, et de la Danish Diabetes and Endocrine Academy.

ref. Aliments ultratransformés : quels effets sur notre santé et comment réduire notre exposition ? – https://theconversation.com/aliments-ultratransformes-quels-effets-sur-notre-sante-et-comment-reduire-notre-exposition-271447