How many children in the UK are obese?

In England's most recent National Child Measurement Programme (2024/25), 10.5% of reception children (age 4–5) and 22.2% of Year 6 children (age 10–11) were living with obesity. The broader Health Survey for England puts 15% of children aged 2 to 15 in the obese category. The figures differ because the two surveys cover different ages and use different methods.

Is childhood obesity getting worse in the UK?

The national picture has been broadly stable for over a decade, sitting between roughly 14% and 17% of children aged 2 to 15. But obesity among reception-age children rose to 10.5% in 2024/25 — its highest level since the programme began in 2006/07, setting aside the 2020/21 pandemic peak — and the gap between the most and least deprived areas keeps widening.

Why are children in deprived areas more likely to be obese?

Children in the most deprived areas are about twice as likely to be living with obesity, and severe obesity runs around four times higher. The drivers sit largely outside any individual child's control: the cost and availability of healthy food, marketing of energy-dense products, access to safe places to play, and wider household pressures. The gap is already visible by age four or five.

Does childhood obesity continue into adulthood?

Often, yes. A widely cited meta-analysis found that about 55% of children with obesity still had it in adolescence, and around 80% of adolescents with obesity carried it into adulthood. That persistence is part of why childhood obesity raises the long-term risk of type 2 diabetes, heart disease and other conditions.

Which part of England has the highest childhood obesity?

On the 2023/24 figures, Year 6 obesity was highest in the North East (24.5%) and lowest in the South West (19.1%). For reception children, the West Midlands, North East and Yorkshire and the Humber topped the list. Rates tend to be higher across the North and Midlands, closely following the pattern of deprivation.

Childhood Obesity Statistics UK 2026: The Latest Data

Published on: June 26, 2026

Medically reviewed by

Ashis Tandukar

Superintendent Pharmacist · Reg: GPhC No. 2084170

Every autumn, the same headline does the rounds. A fifth of children leave primary school living with obesity. It lands, it unsettles people for a day or two, and then it slips out of view until the next year's figures arrive.

The numbers deserve more than that. They tell a story about where children grow up, how much their families earn, and what happens to their health decades later. If you're a parent, a teacher, a journalist or a policymaker trying to make sense of it all, here's what the most recent UK data actually shows — and where the figures come from, so you can use them with confidence.

At a glance

In 2024/25, 10.5% of reception children (age 4–5) and 22.2% of Year 6 children (age 10–11) in England were living with obesity, according to the National Child Measurement Programme.
Reception obesity has climbed to its highest level since the programme began in 2006/07, once you set aside the 2020/21 pandemic spike.
Children in the most deprived areas are roughly twice as likely to be living with obesity — and severe obesity runs around four times higher.
Roughly 8 in 10 adolescents living with obesity carry it into adulthood, which is why these figures matter well beyond the school gates.
The wider cost is counted in the tens of billions, with one analysis valuing a reversal at hundreds of billions over today's children's lifetimes.

How many children in the UK are living with obesity?

Two big sources measure this, and they don't say exactly the same thing. That's not a contradiction — they're built differently, and knowing which is which saves a lot of confusion.

The first is the National Child Measurement Programme (NCMP). Every school year in England, children in reception and Year 6 are weighed and measured. It's close to a full census — more than a million children — which makes it the most reliable read we have on those two age groups.

The most recent NCMP, for the 2024/25 school year, found that 10.5% of reception children (age 4–5) and 22.2% of Year 6 children (age 10–11) were living with obesity. Put another way: around one in ten of the youngest children, rising to more than one in five by the final year of primary school.

The second source is the Health Survey for England (HSE), a smaller annual survey that covers a broader age range. Its 2024 figures put 15% of children aged 2 to 15 living with obesity, and 26% overweight or living with obesity. The sample is much smaller, so the figure comes with a wider margin of error — the true rate is likely somewhere between 12.6% and 17.7%.

So when one report says 22% and another says 15%, both can be right. They're measuring different ages, with different methods. For year-on-year tracking of school-age children, the NCMP is the one most analysts reach for.

Reception versus Year 6: obesity more than doubles across primary school

The single most striking thing in the data is what happens between a child's first and last year of primary school.

Measure (NCMP, England, 2024/25)	Reception (age 4–5)	Year 6 (age 10–11)
Living with obesity	10.5%	22.2%
A healthy weight	74%	61%

Obesity prevalence roughly doubles over those six years. By age 10–11, more than a fifth of children are living with obesity and around a third are overweight or obese once you combine the categories.

Boys are slightly more likely than girls to be affected. At reception the gap is tiny — under a percentage point — but by Year 6 it widens to around five percentage points. The reasons aren't fully settled, but differing growth patterns and activity levels both play a part, which is why childhood BMI is always assessed against age- and sex-specific charts rather than the single adult threshold of 30.

The deprivation gap is the real headline

If you only take one figure away, make it this one. A child's postcode shapes their odds more than almost anything else in the dataset.

In 2024/25, obesity among reception children stood at 14.0% in the most deprived areas, compared with 6.9% in the least deprived. By Year 6 the split was even starker: 29.3% in the most deprived areas versus 13.5% in the least. Children in the poorest neighbourhoods are about twice as likely to be living with obesity — and rates of severe obesity have run around four times higher.

This gap has been widening, not closing. Year after year, the line for the most deprived areas pulls further away from the line for the most affluent. It's the clearest signal in the figures that childhood obesity isn't simply about individual choices — it tracks the food environment, household budgets, green space, and the relentless marketing of cheap, energy-dense food.

Childhood obesity varies sharply by region

England is far from uniform. Using the 2023/24 NCMP figures, which give the clearest regional breakdown, reception obesity was highest in the West Midlands (10.9%), the North East (10.8%) and Yorkshire and the Humber (10.7%), and lowest in the East of England (8.4%), the South East (8.6%) and the South West (8.8%).

By Year 6 the spread was wider still, running from 24.5% in the North East down to 19.1% in the South West. The broad pattern is consistent: rates tend to be higher across the North and the Midlands and lower across the South, closely shadowing the deprivation picture rather than anything regional in its own right.

For journalists and local commissioners, the local authority data sits beneath these regional figures, and it's where the most quotable contrasts live — neighbouring boroughs can differ by ten percentage points or more.

How childhood obesity has changed over time

It's tempting to assume the trend only ever points up. The longer record is more nuanced.

Looking at the Health Survey for England series, obesity among children aged 2 to 15 climbed from around 12% in 1995 to a peak of roughly 19% in 2004, then eased back to about 16% by 2008 and has hovered between 14% and 17% ever since. In broad terms, the national rate has been more of a high plateau than a steady climb over the past 15 years.

But two things cut against any complacency. First, the youngest children are moving in the wrong direction: reception obesity rose to 10.5% in 2024/25, its highest level since the NCMP began in 2006/07 — pandemic peak aside. Second, that widening deprivation gap means a flat national average is masking very different experiences depending on where a child lives.

Why these numbers matter beyond childhood

A statistic about a five-year-old can feel abstract. It doesn't stay abstract.

Childhood obesity tends to persist. A widely cited meta-analysis found that 55% of children living with obesity continued to do so through adolescence, and around 80% of adolescents with obesity still had obesity as adults. The patterns set in early are remarkably sticky.

That carries real clinical weight. Obesity in childhood raises the risk of type 2 diabetes, high cholesterol, asthma and cardiovascular problems — some of which now appear in teenagers, not just in middle age. And the adults these children become make up the figures in our companion piece on obesity statistics across the UK, where 28% of adults in England are living with obesity and nearly two-thirds are overweight or obese.

There's a hopeful reading here too. Because so much of adult obesity has roots in childhood, the early years are also where prevention does the most good — through food environments, school meals, activity, and earlier, less stigmatising support for families.

What childhood obesity costs the UK

The human cost is the point. But the financial figures are what tend to move policy, and they are large.

The NHS in England spends an estimated £6.5 billion a year treating obesity-related ill health across all ages, with wider costs to society estimated far higher again. Zoom in on children specifically and the projections are sobering: one analysis estimated that the pandemic-driven rise in overweight and obesity among 10- and 11-year-olds alone could cost the NHS around £800 million, with the cost to wider society reaching at least £8.7 billion over those children's lifetimes.

Run it the other way, and the prize is enormous. The Institute for Public Policy Research has estimated that bringing childhood obesity back down could save the NHS roughly £66 billion and be worth around £359 billion to the economy over the lifetimes of today's children — a combined figure north of £400 billion. Few areas of public health offer numbers on that scale.

A note on reading these figures well

Childhood obesity statistics get misquoted constantly, usually in small ways that add up. A few things worth holding onto:

The NCMP measures reception and Year 6 only, so a phrase like "a fifth of children are obese" really means a fifth of Year 6 children, not all children. Mixing up the surveys — NCMP and the Health Survey for England — is the most common slip, and it's why two accurate reports can quote different national figures. And BMI in children is judged against age- and sex-specific growth charts, so the adult cut-off of 30 simply doesn't apply.

Get those three things right and you're already handling the data more carefully than most coverage manages. If you want the grown-up picture alongside this, our breakdown of weight-loss treatment uptake across the UK and a refresher on building meals around high-protein, lower-calorie foods both pick up where this leaves off.

The bottom line

Around one in ten reception children and more than one in five Year 6 children in England are living with obesity, and the gap between the richest and poorest areas keeps widening. The national average has been broadly stable, but that flat line hides very different realities — and because childhood obesity so often follows children into adulthood, the early years are where support and prevention count most.

This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before starting any treatment.