Lead: A Unicef analysis released this week finds that, for the first time, more children and adolescents worldwide are classified as obese than underweight. The study estimates about 188 million people aged 5–19 — roughly one in 10 — are now obese, while the share of underweight children in that age group has fallen. Researchers point to a global shift from traditional diets toward cheaper, ultra-processed foods high in sugar, salt and unhealthy fats. Unicef is urging governments to shield children from unhealthy ingredients and to limit industry influence on nutrition policy.
Key Takeaways
- About 188 million children and young people aged 5–19 are estimated to be obese, representing roughly 9.4% of that age group.
- Underweight prevalence among 5–19 year olds has declined from nearly 13% in 2000 to 9.2% in the latest data.
- The total number of overweight school-age children and adolescents is now around 391 million, or about 1 in 5 globally.
- Obesity now exceeds underweight in all world regions except sub-Saharan Africa and South Asia.
- Some Pacific island states show the highest obesity rates: Niue 38%, Cook Islands 37%, and Nauru 33% among 5–19 year olds.
- Several high-income countries also report high obesity prevalence in youths: Chile 27%, United States 21%, United Arab Emirates 21%.
- Unicef estimates the global economic impact of overweight and obesity could surpass US 4 trillion annually by 2035, if current trends continue.
- Policy recommendations include improved labelling, restricting marketing to children, taxing unhealthy foods and removing ultra-processed options from schools.
Background
Historically, malnutrition in children was primarily associated with underweight, wasting and stunting. Over the past two decades that picture has shifted: many countries are now confronting a so-called double burden, where undernutrition and obesity coexist within the same populations, communities and even households. This transition has been driven in part by changes in food systems: traditional, locally sourced diets are being replaced by inexpensive, calorie-dense ultra-processed foods that are widely marketed and distributed.
Childhood nutrition is a determinant of growth, cognitive development and long-term health. Excess weight in childhood is linked to higher lifetime risk of type 2 diabetes, cardiovascular disease and some cancers. Low- and middle-income countries face particular challenges because health systems and social protections were not designed to address rising obesity alongside persistent undernutrition among younger children.
Main Event
The Unicef analysis synthesizes data from more than 190 countries to compare trends since 2000 and to map current prevalence by age, sex and region. It finds obesity among 5–19 year olds rose from about 3% in 2000 to 9.4% in the latest period, while underweight in the same age group fell from nearly 13% to 9.2%. The combined effect is that obesity now outnumbers underweight globally for the first time on record.
Unicef highlights the role of ultra-processed foods, which are often cheaper and more convenient than fresh produce. The agency urges policy interventions such as mandatory front-of-pack labelling, tighter restrictions on advertising to children, fiscal measures like taxes on sugary drinks and unhealthy snacks, and reformulation of products to reduce sugar, salt and unhealthy fats.
The report also calls for stronger safeguards to prevent conflicts of interest, recommending that ultra-processed food and beverage companies be excluded from participation in policy design and implementation related to child nutrition. Unicef warns that industry interference can undermine public health goals and slow adoption of effective measures.
Analysis & Implications
For public health planners, the shift means countries must recalibrate nutrition programs to address both undernutrition and obesity simultaneously. School feeding programs built around caloric quantity without attention to nutritional quality may inadvertently contribute to excess weight. Investments that make nutritious foods affordable and accessible will be needed alongside safety nets that reach the poorest households where stunting and wasting remain problems.
Economically, the projected cost of inaction is substantial. Unicef cites estimates that global losses from overweight and obesity could exceed US 4 trillion per year by 2035, a burden that will strain health services and reduce productivity. For low- and middle-income countries, those losses can undermine development progress and divert scarce resources from other priorities.
Politically, the recommendations raise contentious issues: taxes, marketing restrictions and product reformulation are effective tools but face opposition from food industry stakeholders. Implementing robust conflict-of-interest rules will test governments capacity to resist lobbying and to prioritize population health, particularly where regulatory frameworks are still evolving.
Comparison & Data
| Indicator | 2000 | Latest |
|---|---|---|
| Prevalence of underweight (age 5–19) | ~12.9% | 9.2% |
| Prevalence of obesity (age 5–19) | ~3.0% | 9.4% |
| Number overweight (age 5–19) | — | ~391 million (about 1 in 5) |
The table summarizes the broad shift since 2000: underweight rates have fallen while obesity rates have risen threefold among school-age children and adolescents. The rise in overweight and obesity reflects both absolute increases in high-prevalence countries and new cases in regions previously dominated by undernutrition. Regional exceptions remain: sub-Saharan Africa and South Asia still report higher rates of underweight than obesity among 5–19 year olds.
Reactions & Quotes
Unicef’s leadership framed the findings as a wake-up call for policymakers.
In many countries we are seeing the double burden of malnutrition, with stunting and obesity present at the same time. Nutritious and affordable food must be available to every child, and policy action is urgently needed.
Catherine Russell, Executive Director, Unicef
The report also stresses the potential economic consequences if trends continue and calls for protective policy measures.
By 2035 the global economic impact of overweight and obesity could exceed US 4 trillion per year if no effective action is taken.
Unicef report (official estimate)
Unconfirmed
- Attribution of the entire rise in childhood obesity to ultra-processed foods alone remains an association; multiple social and economic factors also contribute.
- Precise country-by-country projections of obesity trends to 2035 can vary substantially depending on assumptions about policy adoption, economic growth and food environments.
Bottom Line
The Unicef analysis documents a turning point in global child nutrition: obesity now surpasses underweight among 5–19 year olds in most regions. That does not mean undernutrition has been solved; rather, many countries now face a dual challenge requiring integrated policy responses that safeguard children against both nutrient deficits and excesses.
Policymakers can act on several fronts with evidence-based tools: protect school food environments, tighten marketing to children, implement fiscal measures and require transparent policymaking free from industry conflicts of interest. The costs of inaction are high, but targeted interventions can slow or reverse current trends and support healthier outcomes for the next generation.