Category: The Conversation

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

Exercise is a cornerstone of good health and evidence shows it can even help prevent cancers returning following treatment. But new findings are raising an unexpected question: could very high-volume endurance training carry its own risks?

At the 2025 American Society of Clinical Oncology meeting, researchers from Inova Schar Cancer Institute reported that a surprising number of dedicated marathon and ultramarathon runners had precancerous growths in their colons. Among 100 athletes aged 35 to 50, 15% had advanced adenomas – lesions that can develop into bowel cancer – while 41% had at least one adenoma.

The study is small and not yet peer-reviewed, but the signal is strong enough to have captured global attention. Here’s what the findings really mean, why experts urge caution in interpreting the results, and what runners should watch for.

At first glance, it seems counterintuitive. Decades of evidence show regular exercise lowers cancer risks, including bowel cancer, and improves outcomes after a cancer diagnosis. This study doesn’t overturn that science. Instead, it suggests a narrow group of young, very high–volume endurance athletes might face unique bowel stress that could increase their odds of developing precancerous changes over time.

Young people with colon cancer has been called a new epidemic, and we don’t really understand why it’s increasing so much.

The Inova study deliberately excluded people with known genetic conditions or bowel disease to focus on runners who otherwise seemed low risk. Yet their screening found more advanced lesions than expected for that age group – a pattern outside experts, commenting in the New York Times, described as worth investigating, not a final answer.

How might heavy endurance training contribute to bowel changes? One theory focuses on temporary blood flow reductions to the gut during prolonged, intense exercise. Distance runners are familiar with runner’s colitis – cramping and occasional bleeding after long runs. Repeated cycles of low–oxygen stress, inflammation and tissue repair in the bowel could, theoretically, encourage adenoma development in susceptible people.

The Inova team highlighted this mechanism based on observations and runners’ reports of gut symptoms, though the study didn’t directly measure blood flow, oxygen or inflammation markers. It also didn’t isolate other lifestyle factors that might matter, such as dehydration strategies, anti–inflammatory drug use, specific nutrition practices, or very low body fat levels.

Just as important is what this study doesn’t establish. It doesn’t prove marathons or ultramarathons cause bowel cancer. It doesn’t show most young–onset bowel cancers occur in runners – doctors not involved in the study emphasised that most younger patients with these cancers aren’t endurance athletes. And it doesn’t address whether more moderate exercise carries similar risks.

The comparison point – the expected rate of advanced adenomas in the late 40s – comes from broader population studies, not from a matched control group. That makes the observed difference notable but still preliminary.

The research is clinically grounded, but its size and design mean it should be seen as a starting point for larger studies rather than a basis for changing general exercise guidance.

Still, there are practical lessons for endurance athletes and doctors. First, persistent blood in stool, changes in bowel habits, unexplained stomach pain, or iron–deficiency anaemia shouldn’t be dismissed as “just running”.

In a community where gut complaints are common and often normalised, it’s easy to miss warning signs. The lead oncologist argued that young runners with bleeding after long runs should be offered screening – a stance grounded in the fact that colonoscopy can remove precancerous lesions and prevent cancers developing. This is more cautious than current guidelines for average–risk adults but aligns with individualised, symptom–driven care.

Second, the study reinforces the difference between exercise as medicine and exercise as extreme sport. For cancer prevention and overall health, the strongest evidence supports regular, moderate–to–vigorous activity, not necessarily repeated ultra–endurance feats.

Careful attention needed – not panic

Recent conferences highlighted data showing structured exercise after bowel cancer treatment improves long–term outcomes, underlining that physical activity remains one of the most powerful, low–cost tools in cancer prevention and care. This runner study doesn’t contradict that larger story. It flags a potential exception at the extreme end of training that needs careful attention, not panic.

If future research confirms a link, what might change? Screening recommendations could evolve for a clearly defined group of high–volume endurance athletes, perhaps starting colonoscopy earlier than the current age–45 threshold for average–risk adults.

Athletes and coaches might adapt training, nutrition and recovery to protect gut health – paying attention to hydration, heat stress, gradual progression, and avoiding unnecessary anti–inflammatory medication around long efforts.

Sports medicine and gastroenterology clinics might work together on protocols for evaluating gut bleeding in runners, narrowing the gap between “common” and “concerning” symptoms. But these steps depend on replication in larger, diverse groups and understanding which components of endurance life – intensity, duration, heat, altitude, nutrition – matter most.

For now, a balanced message serves the public best. Endurance running is a profound source of meaning and health for many people, and quitting running isn’t the lesson from a single small study.

The key is keeping the proven benefits of exercise in view while being clear–eyed about potential risks at extremes. Listen to your body’s signals, especially bleeding. Treat red–flag symptoms as medical, not merely athletic. And discuss personal risk factors and family history with your doctor.

As science probes this signal further, the likely outcome isn’t a blanket warning but more nuanced guidance: who might need earlier screening, when to investigate symptoms, and how to train hard with the gut in mind.

The study’s real contribution may be cultural as much as clinical: it gives runners and doctors permission to ask a question they’ve too often waved away, and to catch dangerous lesions before they become cancers.

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. Are ultramarathon runners really at increased risk of bowel cancer? – https://theconversation.com/are-ultramarathon-runners-really-at-increased-risk-of-bowel-cancer-263564

Source: The Conversation – UK – By Sameer Jauhar, Clinical Associate Professor, Imperial College London

For decades, psychiatrists have treated psychosis as if it were separate conditions. People experiencing hallucinations and delusions might be diagnosed with schizophrenia, bipolar disorder, severe depression and related diagnoses, and receive completely different treatments based on diagnosis. But new research suggests this approach may be fundamentally flawed.

Our latest study, published in Jama Psychiatry, reveals that the brain changes driving psychotic symptoms are remarkably similar across these supposedly distinct mental health conditions. The findings could change how doctors choose treatments for the millions of people worldwide who experience psychosis.

Psychosis itself is not a disease, but rather a collection of generally deeply distressing symptoms, where people may struggle to distinguish reality from normal perception. They might hear voices that are not there, hold false beliefs with unshakeable conviction, or find their thoughts becoming jumbled and incoherent. These symptoms are new in onset, and terrifying – regardless of whether they occur alongside depression, mania, or without these mood symptoms.

We studied 38 people experiencing their first episode of psychosis with mood symptoms, comparing them with healthy volunteers. Using sophisticated brain scanning technology, we measured the synthesis of dopamine – a brain chemical tied to motivation and reward – in different regions of the brain.

We found that while most people with manic episodes showed higher dopamine synthesis in emotion-processing areas of the brain compared to those with depression, there was a common pattern across all participants: higher dopamine synthesis in thinking and planning regions were consistently linked to more severe psychosis symptoms (hallucinations and delusions), regardless of their official diagnosis.

This discovery challenges some aspects of modern psychiatric practice. Currently, treatment decisions rely heavily on diagnostic categories that may not reflect what is actually happening in people’s brains. Two people with identical symptoms might receive entirely different drugs simply because one was diagnosed with bipolar disorder and another with depression.

Our study shows dopamine dysfunction is not uniform in psychosis. Moving beyond trial-and-error prescribing requires matching treatments to underlying biology rather than diagnostic categories alone.

Towards precision psychiatry

The implications could be profound. Rather than basing treatment solely on psychiatric categories, doctors might soon use biological markers to identify which drugs will work best for individual people. This approach, known as precision psychiatry, mirrors how oncologists already tailor cancer treatments to the genetic makeup of specific tumours.

For people with psychosis, this could mean faster recovery and fewer side-effects, by switching from drugs that do not work. Finding the right treatment often involves months of trying different drugs while people continue to suffer from debilitating symptoms.

Our research suggests people whose psychosis involves strong mood symptoms might benefit from drugs that target emotion-processing brain circuits, while those without mood disorders might need drugs that work differently on thinking and planning regions. Some people might even benefit from treatments that address cognitive problems alongside hallucinations and delusions.

This does not mean psychiatric diagnoses are worthless. They remain crucial for organising healthcare services, facilitating communication between professionals, and determining access to treatment. But they may no longer be the best guide for choosing medications.

The study involved a relatively small number of people, and the findings need to be replicated in larger groups before changing clinical practice. Still, this research represents a significant step towards a more scientific, biology-based approach to treating one of psychiatry’s most challenging symptoms.

As our understanding of the brain advances, the rigid categories that have dominated psychiatry for decades are beginning to blur. If the brain (and mother nature) does not respect diagnostic boundaries, neither should our treatments.

Dr Jauhar reported personal fees from Recordati, LB Pharmaceuticals, Boehringer Ingelheim, Wellcome Trust, Lundbeck, Janssen, and Sunovion and nonfinancial support from the National Institute for Health and Care Excellence, British Association for Psychopharmacology, and Royal College of Psychiatrists outside the submitted work.

Robert McCutcheon receives personal fees from Boehringer Ingelheim, Janssen, Karuna, Lundbeck, Newron, Otsuka, and Viatris outside the submitted work.

– ref. Brain chemistry reveals psychiatry’s false divisions – new study – https://theconversation.com/brain-chemistry-reveals-psychiatrys-false-divisions-new-study-263319

Source: The Conversation – UK – By Aurora Moxon, Postdoctoral Fellow, University College Cork

High in the Aspromonte mountains in the toe of Italy’s boot lies the ancient Calabrian village of Bova. Over the last two millennia, a series of invaders and settlers have left their mark on the Aspromonte, including the ancient Greeks – influencing a way of life from farming to language.

Protected by the absence of roads until the mid-20th century, remnants of this Greek culture survive in Bova. The Greco-Calabro language, spoken day-to-day only by local goatherders and the elderly, includes words and phrases from ancient Greek. And for centuries, locals have created “Persephoni” – woven symbols of Persephone, the Greek goddess of spring, to celebrate the season’s arrival and invoke an abundant agricultural year.

Made from olive leaves woven onto canes and decorated with local wildflowers, fruit and goat’s cheese, these figures represent an important ritual to mountain people whose lives have depended on the land for centuries. Gradually, as Christianity was adopted by the Romans, these figures were absorbed into Catholic rituals by these local people.

From the 1990s, the Persephoni figures attracted attention as interest in the Greek cultural influences of the area grew. Then, in 2013, the local bishop refused to allow Persephoni to enter Bova’s cathedral after being informed these structures were folkloric puppets (pupazze) – a move that threatened this longstanding tradition with pre-Christian roots.

Challenging ideas of what is ‘modern’

As well as researching food, farming and ecotourism in the Aspromonte mountains, I investigate the negative effects of stereotypes of this area – and how contemporary local practices challenge ideas of what is “modern”. As part of this study, I visited Bova and spoke to villagers about their way of life.

Some told me how, in 2014, they successfully put pressure on the church to restore their cherished Persephoni tradition. They explained to the bishop the importance of the Persephoni, and the church’s blessing for this ancient tradition – which prompted him to relent and allow the figures back into Bova’s cathedral.

However, as I witnessed earlier this year, the current priest’s message reiterated the church’s distance from what it calls “folklore” – despite the thousands of visitors the Persephoni attract to Bova, a village that is losing its young people every year to other towns and cities. Journalists and anthropologists continue use the term “puppets” to describe the Persephoni, which puts emphasis on a more pagan intepretation.

In nearby Locri, archaeologists have unearthed terracotta reliefs called pinakes (depicting the goddess of spring and the agricultural seasons) at the site of a shrine to Persephone. Referred to as the “flower-faced maiden” in the Homeric Hymns – a collection of 34 Greek poems addressed to the ancient gods – it’s not hard to understand why locals believe their celebration of Persephone has Ancient Greek origins.

Carrying their Persephoni around Bova on Palm Sunday and receiving the priest’s blessing before taking them into mass is one of the most important moments of the religious year for locals here. It’s the culmination of a month of long evenings spent plaiting pairs of olive leaves from local trees and attaching them to cane skeletons. Two metres tall, the largest Persephone is carried by Bova’s mayor.

On the eve of Palm Sunday, people decorate their Persephoni with fruits and flowers picked from local hillsides, and the following morning, goat’s cheeses called musulupu are added on. Some of these cheeses take the form of men and women, others are circular with “teats”. Like Persephone, they symbolise fertility and new birth.

Every year, thousands of people visit Bova to watch the procession, after which the local people hand out chunks of musulupu and ’nguta (a biscuity cake with hard-boiled eggs baked into the mix) in the town’s main square.

Population decline, cultural loss

Like much of Italy’s south, especially its mountainous areas, Bova has long suffered the effects of emigration. Today, inhabitants are attracted to jobs and the lifestyle in towns along Calabria’s built-up coast. In the 1970s, Bova’s population numbered 1,401; today it hovers around just 400.

Young Bovese feel compelled to leave the region once they have finished school. Agropastoralism, a form of subsistence farming involving the cultivation of crops and raising livestock, does not appeal to many youngsters, and yet a number of villagers continue to work as goatherders and small-scale farmers. Once landless, they now find themselves in a position to buy up abandoned land.

Goatherders milk their capre Aspromontane, an indigenous breed of goat, to make the cheeses attached to the Persephoni, pressing them into intricately carved wooden moulds. These goatherders use words from Greco-Calabro to describe their goats: zzarì means “grey coat”, for example, and zzerògasto means “hard to milk”.

While the Greco-Calabro language is a source of pride, the historic association of this language with herders and landless peasants has contributed to its decline.

Today’s grandparents discouraged their children from speaking it, as the language had become a marker of shame and perceived backwardness. This is part of a wider problem that sees the denigration of southerners in Italy – particularly in rural areas – as backward terroni, meaning “people who are the dirt beneath our feet”.

But herders and small-scale farmers in the mountains are also often called backward by middle-class Calabrians in cities and coastal towns. The relentless association of Calabria – and the Aspromonte in particular – with organised crime exacerbates the marginalisation of this area.

Through their symbolic figures of Persephone, inhabitants of Bova assert the value of their deeply rooted rural identity and ancient agropastoral spirituality, insisting the Catholic church recognises this hybrid religious practice. The determination to preserve it speaks of resistance in the face of population decline and cultural loss.

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Aurora Moxon receives funding from the Irish Research Council. Aurora Moxon previously received funding from the South West and Wales Doctoral Training Partnership.

– ref. How a church row over a pre-Christian ritual reflects an ancient Italian village’s battle for survival – https://theconversation.com/how-a-church-row-over-a-pre-christian-ritual-reflects-an-ancient-italian-villages-battle-for-survival-258852

Source: The Conversation – UK – By Tony Kushner, James Parkes Professor of Jewish/non-Jewish Relations, University of Southampton

This article contains details of antisemitism and violence that some readers may find upsetting.

It’s evening at a remote Sussex pub in 1734 and a vicious triple murder has just taken place. Jacob Harris – a Jewish pedlar, smuggler and possible highwayman – stands accused of slitting the throats of the publican, his ill wife and a female servant.

I’ve studied the case for my latest book, The Jewish Pedlar: An Untold Criminal History. The point of interest for me was not whether Harris was guilty (he probably was). Or even whether – despite the seriousness of the crime – he was a victim of English antisemitism in everything from the newspaper coverage to the way he was later remembered. I was more interested in a series of questions about Harris’s background and motivations.

Harris had many aliases including Hirshal Hirsh and James Daves, reflecting both his criminal tendencies and complex identity that was both continental Jewish and very local. How on earth did someone of German-Jewish origin manage to integrate himself into the close-knit smuggling fraternity of Sussex?

What was Harris even doing in Ditchling Common, many decades before there was anything approximating to a Jewish community in Sussex? And what motivated him to commit the murders?

Despite the potential for prejudice against Jewish people at the time, I concluded that in the criminal world, as long as someone was trusted and useful, their background did not matter. It was only when Harris fell out with a fellow smuggler leading to a fatal fight that his life fell apart. The quandary for me as a social and cultural historian was how to write anything like a biography of Harris when there are no direct quotes from him in the surviving archive.

Completing my 340-page study therefore felt like somewhat of an achievement. To do so required intricate detective work (and indeed the advice of a real retired detective) to interrogate every piece of contemporary evidence.

This included the sparse legal record of the murders, the first Sussex assizes (court) record to be kept in the National Archives at Kew; a contemporary diary from a local landholder; and copious reports in British newspapers which “borrowed” heavily from one another.

There was also a bill sent to the Treasury by the county of Sussex for the catching, imprisonment, trial, hanging and gibbeting of Harris (gibbeting involves placing a hanged body in a specially constructed iron cage at the scene of the crime). And there was a ballad which would have been written and sold at the gibbeting and has survived in various forms ever since.

Not one of these sources is straightforward, and this is also true of most of the authors and major players in contemporary responses to the murders.

The complexities of the case

Harris was not the only person in the case who had multiple names. There was also his first victim, the publican Richard Miles. His many names strongly suggest that he was on the wrong side of the law and almost certainly a fellow smuggler.

The lead justice of peace in the case, who later became an MP and major landowner, had also changed his name. As did the newspaper entrepreneur who was the only one who made explicit Harris’s Jewishness when reporting in his new title, Walker’s Weekly Post.

Even Sir Robert Eyre, the judge from London who sentenced Harris to be hanged and gibbeted, had a reputation for corruption, though I’m not saying it affected the decision in this case. I don’t doubt that Harris was guilty of the horrendous crimes he was charged with.

The gibbeted body

Having been found guilty in the county assizes at Horsham and hanged in that town, Harris’ body was then carted to the scene of the crime a good 15 miles away to be placed in the gibbet cage.

A history of a local Sussex family compiled over many generations suggests that his skull remained in the cage some decades later. The post from which the gibbet cage was hung remained in position for much longer and soon became known as “Jacob’s Post”. Despite his crimes and his Jewish origins, he became a local folk hero.

To this day there is a heritage display on Ditchling Common to mark this momentous event in the district’s history.

Later Jewish criminals who were hanged became prized for their body parts by surgeons such as William Hunter (of the Hunterian museum in London) for racialised display. I didn’t want to treat Harris as this kind of object of study, but as a human being with family and friends (and no doubt enemies).

To discover more about Harris, his occupations and identity, I covered the period up to the second world war and followed Jewish pedlars and criminals in many different places from China to South America, from Sierra Leone to the Hebrides and from South Africa to the Caribbean. I also charted how the memory of Harris altered through time, from the Victorians who saw him as racially different and “naturally” criminal, through to a growing sensitivity towards his Jewishness in a post-Holocaust world.

It might be argued that at a time of growing hostility towards those of migrant origin and increasing racism, including antisemitism, what we don’t need now is a book on a Jewish criminal. I would argue that by trying to understand the individuality of these often remarkable – if often controversial – figures, it emphasises their fundamental humanity.

We cannot – and must not – expect any group of people to be perfect. As an asylum seeker (a former professional in Yemen) in an Essex hotel which has been subject to constant demonstrations in summer 2025 told The Guardian: “Yes, there are some refugees who do not behave respectfully or who do not follow the rules of the host society.” He added that this should not mean that all are regarded as such and that “every refugee has a story, and every human deserves dignity”.

In this respect in my book I certainly do not glorify Harris or downplay his crimes. I do, however, insist that he is not demonised as a “Jew murderer” as the Victorians would have it, and that see him instead as part and parcel of 18th century English rural life – a world far more diverse than we often assume.

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This article features references to books that have been included for editorial reasons, and may contain links to bookshop.org. If you click on one of the links and go on to buy something from bookshop.org The Conversation UK may earn a commission.

Tony Kushner 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. Why I had to become a murder detective for my book about an 18th-century Jewish pedlar – https://theconversation.com/why-i-had-to-become-a-murder-detective-for-my-book-about-an-18th-century-jewish-pedlar-262671

Source: The Conversation – UK – By Will de Freitas, Environment + Energy Editor, The Conversation

The ocean is heating up – in some places, faster than scientists once thought possible. For the fish, crustaceans and plankton that underpin life in the sea, this means habitats will shift, food supplies will change, and predators may suddenly find their prey has vanished. This isn’t a simple story of loss, but of winners and losers in a lottery weighted by climate change.

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Fish are already threatened by polluted seas and overfishing by humans. Climate change adds another threat by reshaping the very waters they depend on – testing their ability to adapt.

Sevrine Sailley, a marine ecosystem modeller at Plymouth Marine Laboratory, explains:

“As the ocean heats up, fish try to stay in the conditions they’re best suited to. Some species will move, but others can’t relocate so easily – for example, if they need to live in a certain habitat at a particular life-stage, such as in kelp that offers shelter for breeding fish.”

Sailley and her colleagues used a computer programme to simulate the oceans around the UK over the rest of this century. They looked at 17 key commercial species and identified some winners and losers:

“While sardines may thrive, with a 10% boost in Atlantic abundance, our model suggests mackerel could decline by 10% in the Atlantic and 20% in the North Sea.”

Warm-water species like bluefin tuna could do well, she writes, but “bottom-dwelling species like cod and saithe (pollock) face a tougher future. These fish prefer colder, deeper waters and have fewer options to escape warming seas due to depth limitations.”

Read more:
How climate change is making Europe’s fish move to new waters

Sudden changes

Those fish are typically responding to what’s happening below them in the food web. And these shifts don’t just play out slowly. They can unfold dramatically during events such as marine heatwaves, when the sea itself becomes layered in ways that choke the food web.

Ocean scientist Tom Rippeth of Bangor University described this process during an “unprecedented” heatwave in the seas around the UK two years ago. That summer, the already-warm surface was heating up faster than ever.

“Those stratified seas”, Rippeth writes, “on the continental shelf around Britain and Ireland are some of the most biologically productive on the planet. They have long been an important area for fishing cod, haddock, mackerel and other species. Those fish eat smaller fish and crustaceans, which in turn feed on microscopic plants known as plankton.”

Those plankton depend on nutrients mixed up from the deep water into the surface layer. However, during the marine heatwave, Rippeth feared the high surface temperatures would mean stronger stratification, less mixing, and a diminished supply of nutrients.

Bad news for the plankton. And bad news that will ripple up the food web.

Read more:
An ‘extreme’ heatwave has hit the seas around the UK and Ireland – here’s what’s going on

What the jellyfish tell us

Few creatures illustrate these shifts more clearly than jellyfish. Marine conservation expert Abigail McQuatters-Gollop of the University of Plymouth says jellyfish numbers are increasing in certain regions, including the UK. For her, this is a signal of dramatic changes in the ocean food web.

Jellyfish tend to feed directly on plankton, so they’re pretty low in the food web. In fact, since they drift rather than swim, they’re technically plankton themselves. Yet they’re big enough (and scary enough, in some eyes) for humans to notice when their numbers rise, which makes them an eye-catching indicator that waters are warming.

“Warmer sea temperatures”, McQuatters-Gollop writes, “mean that jellyfish can now inhabit a wider range of habitats, with some species moving polewards into waters that were once too cold for them.”

This has changed how energy moves through the food web:

“The warmer-water zooplankton species which now dominate northern European waters are generally smaller and less nutritious than the cold-water species they have replaced.”

It also contributes to what scientists call a predator-prey mismatch.

“While the seasonal cycle of phytoplankton [tiny plants] is driven by sunlight and so hasn’t changed, the point in the year when some zooplankton species [tiny animals] are most abundant now arrives earlier, as shorter and warmer winters cause the eggs of some species to hatch sooner. This has meant a mismatch between the spring phytoplankton bloom and the annual peak abundance of the zooplankton that gorge on it.”

These shifts cascade upwards through the food web – one reason why those warm-water bluefin tuna are likely to prosper in UK waters, while cold-water cod and herring are set to struggle.

Read more:
Jellyfish alert: increased sightings signal dramatic changes in ocean food web due to climate change

Post-carbon

Last week, we asked if severe heatwaves have affected your holiday plans. Several readers said they had given up on summer holidays in hot countries entirely.

For instance Andrew Strong said: “We are not holidaying in Europe between June and September, not even in the UK! It’s too much.”

Next week, we’d like your thoughts on air conditioning at home. Do you have it? Do you want it? Do you see it as an unnecessary and frivolous waste of energy, or an inevitable response to increasing summer heat? (If you’re American or Australian, do you laugh at us backwards Europeans for even having this debate?).

– ref. Winners and losers in a hotter ocean – https://theconversation.com/winners-and-losers-in-a-hotter-ocean-263556