Global
Childhood Obesity Emerges as a Major Global Health Concern
Rising obesity rates among children and adolescents highlight an urgent need for global action on nutrition, lifestyle changes, and public health policies.
World Obesity Day, observed every year on 4 March, aims to raise awareness about obesity and its growing health, social and economic consequences. According to the World Health Organization (WHO), obesity among adults has more than doubled since 1990, while rates among adolescents have increased fourfold. Once considered largely a problem of high-income countries, obesity is now rising rapidly in low- and middle-income nations as well. United Nations health estimates indicate that about 3.7 million deaths worldwide in 2021 were linked to diseases associated with obesity.
Understanding Obesity: A Complex Chronic Disease
Overweight and obesity occur when excess body fat accumulates because energy intake exceeds energy expenditure. However, global health experts emphasise that obesity is not merely a lifestyle issue.
Overweight and obesity occur when excess body fat accumulates because energy intake exceeds energy expenditure. However, global health experts emphasise that obesity is not merely a lifestyle issue.
The WHO describes obesity as a complex, chronic disease that can recur over time, influenced by a combination of genetic factors, biological mechanisms, environmental conditions and social determinants. Over the past few decades, factors such as urbanisation, reduced physical activity, changing dietary habits, and the increasing availability of highly processed, energy-dense foods have contributed to rising obesity rates.
Current global estimates suggest that more than one billion people worldwide are living with obesity, underscoring the scale of the public health challenge.
Current global estimates suggest that more than one billion people worldwide are living with obesity, underscoring the scale of the public health challenge.
Children and Adolescents at Rising Risk
A particularly worrying trend is the rapid increase in obesity among children and adolescents. WHO estimates indicate that by 2024 around 35 million children under the age of five were overweight. In addition, more than 390 million children and adolescents aged 5–19 were overweight, including about 160 million living with obesity.
A particularly worrying trend is the rapid increase in obesity among children and adolescents. WHO estimates indicate that by 2024 around 35 million children under the age of five were overweight. In addition, more than 390 million children and adolescents aged 5–19 were overweight, including about 160 million living with obesity.
Excess weight during childhood increases the risk of type 2 diabetes, cardiovascular diseases and other non-communicable diseases, often appearing earlier in life. Health agencies also warn that obesity can negatively affect mental well-being, social interactions, academic performance and overall quality of life. Children who develop obesity are also more likely to remain obese in adulthood, increasing their long-term health risks.
The Double Burden in Developing Countries
Many low- and middle-income countries are now facing a double burden of malnutrition and obesity. UN and WHO analyses indicate that children in these regions may experience undernutrition during pregnancy and early childhood, but later shift toward diets high in fat, sugar and salt, combined with low levels of physical activity. This nutritional transition contributes to rising obesity rates even as undernutrition persists.
Many low- and middle-income countries are now facing a double burden of malnutrition and obesity. UN and WHO analyses indicate that children in these regions may experience undernutrition during pregnancy and early childhood, but later shift toward diets high in fat, sugar and salt, combined with low levels of physical activity. This nutritional transition contributes to rising obesity rates even as undernutrition persists.
Global Initiatives to Address Obesity
International health agencies stress that obesity prevention requires coordinated action. WHO member states adopted global nutrition targets in 2012, aiming to halt the rise of childhood overweight and curb increases in diabetes and obesity by 2025. Recognising the continuing challenge, these targets have been extended to 2030.
International health agencies stress that obesity prevention requires coordinated action. WHO member states adopted global nutrition targets in 2012, aiming to halt the rise of childhood overweight and curb increases in diabetes and obesity by 2025. Recognising the continuing challenge, these targets have been extended to 2030.
At the 75th World Health Assembly in 2022, countries endorsed the WHO Acceleration Plan to Stop Obesity, a global strategy designed to support governments in implementing policies that promote healthier diets and physical activity.
In addition, WHO released its first guidance on the use of weight-loss medicines, focusing on GLP-1–based therapies such as liraglutide, semaglutide and tirzepatide, which help regulate appetite, blood sugar and digestion. However, the organisation emphasises that medications should complement—not replace—balanced nutrition, regular exercise and long-term medical guidance.
Global health experts underline that addressing obesity requires sustained efforts by governments, health systems, communities and the food industry to create environments that support healthier lifestyles.
