Investigative

The First Generation

For the first time in recorded history, British children are developing diseases of middle age before they reach secondary school. Fatty liver. Type 2 diabetes. Hypertension. Metabolic syndrome. The government is continuing to review the evidence.

Nutriofia Investigations · August 2026

The first published case of non-alcoholic fatty liver disease in a child appeared in the medical literature in 1983. A single case report. An anomaly. The authors treated it as such. At the time, fatty liver in the absence of alcohol was understood to be an adult condition — a consequence of decades of poor diet, excess weight, and metabolic deterioration. The idea that a child's liver could be damaged in the same way was, at that point, essentially unthinkable.

It is no longer unthinkable. It is common.

Non-alcoholic fatty liver disease — now classified more precisely as metabolic dysfunction-associated steatotic liver disease, or MASLD — is now the most prevalent form of chronic liver disease in children across the United Kingdom, Europe, and North America. It affects an estimated 5 to 10% of children in the general paediatric population. Among obese children, the prevalence rises to between 30 and 40%. Children as young as two have been diagnosed. The condition was unknown in paediatrics forty years ago. It is now, in the words of a 2023 ESPGHAN expert panel, "a global paediatric epidemic."

This did not happen because children changed. It happened because what we feed them changed — and because the systems that were supposed to prevent it looked away.

What Is Happening Inside the Liver

The liver's job, among many others, is to process what the gut sends it. Nutrients arrive from the intestine via the portal vein. The liver decides what to do with them — package them into lipoproteins for circulation, store them as glycogen, convert them to fat for long-term storage, or break them down entirely. It is one of the most metabolically active organs in the body, and it is designed to handle a remarkable variety of inputs.

It was not designed for fructose at industrial scale.

Fructose — the sugar in table sugar, high-fructose corn syrup, fruit juice, and the overwhelming majority of ultra-processed food — is metabolised almost exclusively in the liver. Unlike glucose, which is distributed to cells throughout the body for energy, fructose arrives at the liver and is processed there, locally, in its entirety. At moderate amounts, from whole fruit, this presents no problem. The fibre in whole fruit slows its delivery, limits the dose, and the liver handles it without difficulty.

The doses arriving in children's livers via sugary drinks, flavoured yogurts, breakfast cereals, cereal bars, fruit pouches, and ultra-processed snacks are not moderate. They are continuous, concentrated, and relentless from the first months of life. The liver converts the excess to fat. That fat accumulates in hepatocytes — the liver cells — and when it accumulates faster than it can be exported, it stays. The liver becomes fatty. Inflammation follows. If the process continues, the inflammation causes scarring. Scarring is fibrosis. Advanced fibrosis is cirrhosis. Cirrhosis, in a child, is a life-altering diagnosis.

Most children with fatty liver disease will not progress to cirrhosis in childhood. But a significant proportion will carry the condition into adulthood, where it compounds with decades of continued dietary exposure and the other metabolic consequences that travel alongside it — insulin resistance, elevated triglycerides, hypertension, elevated cardiovascular risk. The clock starts in childhood. The disease presents in middle age. By then, the connection to what that person was fed at age seven is invisible.

Type 2 Diabetes: The Condition That Was Not Supposed to Happen to Children

Type 2 diabetes was called adult-onset diabetes for decades. The name was changed in part because the name had become misleading. Children are now developing it in sufficient numbers that calling it adult-onset was a clinical embarrassment.

In the United Kingdom, NHS data shows that diagnoses of type 2 diabetes in people under 25 increased by approximately 23% between 2015/16 and 2019/20. The condition is being diagnosed in children as young as seven. It disproportionately affects children from lower socioeconomic backgrounds and certain ethnic groups — reflecting both dietary patterns and genetic susceptibility — but it is not confined to any single demographic. It is spreading across the childhood population at a rate that, in the words of Diabetes UK, represents "a public health emergency."

Type 2 diabetes in childhood carries a more aggressive clinical course than the same condition diagnosed in adulthood. Complications — retinopathy, nephropathy, neuropathy, cardiovascular disease — develop faster and at younger ages. A child diagnosed with type 2 diabetes at twelve faces the prospect of those complications in their twenties and thirties. The NHS, which is already stretched beyond capacity managing the adult type 2 diabetes epidemic, is inheriting a paediatric version it was not built for and cannot absorb.

The Trajectory: What a Diagnosis at Ten Actually Means

A child diagnosed with fatty liver disease at the age of ten has, on current actuarial tables, approximately seventy years of life ahead. That is seventy years during which the liver — already compromised at an age when it should be entirely healthy — is subject to continued metabolic stress, continued dietary exposure, and continued inflammatory pressure.

Here is what the evidence suggests that trajectory looks like, without intervention:

• Age 10MASLD diagnosis. Liver fat present on ultrasound. Liver enzymes mildly elevated. Child is asymptomatic. Intervention is dietary advice and weight management referral.
• Age 16Condition persists through adolescence — a period when ultra-processed food consumption typically peaks and dietary habits are most difficult to shift. Many adolescents are lost to follow-up.
• Age 25Young adult carrying silent liver disease into the food environment of independent living — takeaways, alcohol, shift work, financial constraint. Monitoring has typically ceased.
• Age 35First clinical signals emerge — elevated liver enzymes at a GP blood test, rising blood pressure, prediabetes. Investigation begins. The connection to childhood is not made.
• Age 45Established MASLD with possible MASH (metabolic dysfunction-associated steatohepatitis — the inflammatory stage). Elevated cardiovascular risk. Possible type 2 diabetes diagnosis. Multiple medications.
• Age 55Fibrosis detectable on FibroScan or liver biopsy. Elevated lifetime risk of hepatocellular carcinoma. Reduced liver function beginning to affect metabolism of medications for other conditions.

This is not a worst-case projection. It is the expected trajectory for a significant proportion of children currently sitting in paediatric hepatology clinics — or, more accurately, for the children whose fatty liver disease will never be detected because paediatric liver screening does not exist at scale in the UK. Most of them will never receive a diagnosis until the condition is considerably more advanced.

The Baseline That Has Shifted

There is a fact about this generation of children that makes the problem structurally different from anything that has come before it, and it is a fact that receives insufficient attention in policy discussions.

These children have never known a food environment without ultra-processed food as the dominant category.

Previous generations of adults who developed diet-related disease did so after years of progressive dietary drift — a gradual movement away from real food towards processed alternatives. They had a reference point. They remembered, or their parents remembered, what food that had not been industrially engineered tasted like. They had a baseline.

Children growing up today do not. Ultra-processed food — engineered to deliver precise concentrations of sugar, salt, and fat to maximise consumption, calibrated for palatability at industrial scale — is, for this generation, simply food. The flavour profile that additive and flavour technology has produced is their normal. Whole food — food that tastes of itself, that requires chewing, that is not formulated to trigger maximum dopamine response — tastes strange to many of these children. Not bad, necessarily. Just incomplete. Flat. Less than expected.

This is not an accident. The food industry has known for decades that taste preferences established in early childhood are persistent and commercially valuable. The investment in capturing children's palates — through product design, through advertising, through the engineering of school and hospital vending environments, through the design of children's menus in chain restaurants — has been substantial, sustained, and extraordinarily successful. The generation it produced is the one now presenting at paediatric liver clinics.

This Is Not About Parenting

When the data on childhood obesity, childhood fatty liver disease, and childhood type 2 diabetes is presented in public, the response from some quarters is to locate the failure in individual households. Parents who do not cook. Parents who buy the wrong things. Parents who let their children watch too much television. The implicit — and sometimes explicit — argument is that this is a parenting failure, and that regulation is an overreach into domestic life.

This argument is not only wrong. It is dishonest.

The parents of children with diet-related disease are largely doing what the food environment has been designed to make them do. Ultra-processed food is cheaper per calorie than whole food, consistently and substantially. It requires no preparation time. It is available at every petrol station, newsagent, and school gate. It is packaged to appear nutritious — fortified with vitamins, labelled as "natural," presented in portion sizes calibrated to appear reasonable. It is marketed directly at children through mechanisms that bypass parental decision-making. And when a seven-year-old has been reached by ten thousand food advertisements before they start school — a conservative estimate based on children's average media exposure — their requests at the supermarket are not random. They are the output of a deliberate commercial process.

The parents of these children are not failing them. The regulatory system designed to protect them from this process has failed them. The Food Standards Agency, established specifically to prevent the kind of commercial food environment that now surrounds British children, has spent twenty-five years managing this process voluntarily rather than restraining it mandatorily. The consequences are in the paediatric clinics. They are in the rising type 2 diabetes figures. They are in the livers of children who have never had the chance to choose differently.

What "Continuing to Review" Actually Costs

In January 2025, the government published its response to the House of Lords "Recipe for Health" report — one of the most comprehensive examinations of food policy in a generation. The Lords had recommended mandatory reformulation targets, fiscal levies extended beyond soft drinks, a regulatory definition of ultra-processed food, and restrictions on the placement of unhealthy products in prominent retail positions.

The government would continue to review the evidence.

In 2025, approximately 800,000 children were born in the United Kingdom. Each of them entered a food environment with no mandatory reformulation targets for the ultra-processed products they will consume in their first years of life, no regulatory category that identifies and restricts ultra-processed food as a class, a voluntary front-of-pack labelling system that the majority of products with the most to declare choose not to use, and an advertising restriction framework that came into force three years late and in a form watered down from its original scope.

Each year of continued review is a year's worth of children entering this environment unchanged.

What Actually Works

The honest answer to the question of what works is also, unfortunately, a critique of what the government has chosen not to do. The evidence base is not absent — it is being ignored.

The Soft Drinks Industry Levy works. Manufacturers reformulated dramatically before the levy was introduced, reducing the sugar content of soft drinks by an estimated 28% in the three years following its announcement. Children's sugar intake from soft drinks fell measurably. It is the most successful single food policy intervention in a generation — and it is a mandatory fiscal mechanism, not a voluntary target.

Universal free school meals for all primary school children reduces the dietary inequality gap and improves nutritional intake in children from lower-income households. The evidence from Scotland and pilot programmes in England is consistent. It is also affordable at a policy level. It has not been adopted nationally in England.

Restricting the placement of HFSS products at checkouts, store entrances, and prominent end-of-aisle positions reduces their purchase. The evidence from UK local authority initiatives and international comparators is clear. These restrictions can be mandated. They have not been mandated.

The pattern is the same everywhere the evidence is examined: mandatory interventions work; voluntary ones do not, or not enough, or not consistently, or not for the populations that need them most. The government has the evidence. It has the legislative framework. It has the democratic mandate of a House of Lords report and decades of public health research. What it does not have — or has not yet chosen to exercise — is the political will to apply the lessons of its own evidence to the food environment that children are growing up in right now.