The World Health Organisation (WHO) has warned that rising obesity rates have become a major global health crisis, with more than one billion people now living with obesity worldwide. The agency has highlighted the scale of the problem, stating that obesity rates among adults have more than doubled since 1990, while cases among children and adolescents have increased sharply over the same period. According to a comprehensive WHO report released in December 2025, around 2.5 billion adults globally were classified as overweight in 2022, accounting for nearly 43 per cent of people aged 18 and above. Of these, approximately 890 million adults were living with obesity.

The report also noted that about 35 million children under the age of five are currently overweight, underlining the growing impact of the issue among younger populations. The WHO has described obesity as a chronic, relapsing disease rather than simply a matter of individual lifestyle choices. The organisation said obesity develops through a complex combination of factors, including genetics, neurobiology, eating patterns and environmental conditions. It highlighted the role of industrialised food systems, rapid urbanisation and economic changes that have affected people's access to affordable and nutritious food.

The agency warned that modern food environments have contributed significantly to the rise in obesity rates. Increased availability of highly processed foods, changes in dietary habits and reduced opportunities for physical activity have created conditions where maintaining a healthy weight has become increasingly challenging for many communities. The health consequences linked to obesity are already significant. The WHO reported that in 2021, higher-than-optimal body mass index (BMI) was responsible for an estimated 3.7 million deaths caused by noncommunicable diseases. These included cardiovascular diseases, diabetes, several forms of cancer, neurological disorders and chronic respiratory illnesses.

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Beyond the direct health impact, obesity also places substantial pressure on healthcare systems and economies. Treatment of obesity-related conditions requires long-term medical care, while reduced productivity and increased healthcare spending contribute to wider social and economic costs. Some estimates have placed the global economic impact of obesity in the trillions of dollars, making it one of the most expensive public health challenges facing countries worldwide.

The WHO has called for stronger action from governments, healthcare systems and communities to address the growing crisis. The organisation has emphasised the need for policies that improve access to healthy foods, encourage physical activity and address the environmental factors contributing to unhealthy weight gain. Experts have also stressed that tackling obesity requires a comprehensive approach rather than focusing only on individual behaviour.

Prevention strategies, early intervention, public awareness campaigns and improved healthcare support are considered essential to reducing obesity rates and preventing related diseases. The rise in childhood obesity has emerged as a particular concern for health authorities. Increased weight during early years can raise the risk of developing diabetes, heart disease and other chronic conditions later in life. The WHO has urged countries to introduce measures that support healthier diets and active lifestyles among children and young people.

As obesity rates continue to rise across developed and developing nations, the WHO has warned that the issue requires urgent attention comparable to other major global health emergencies. The organisation has stressed that addressing obesity will require coordinated efforts involving governments, healthcare providers, food industries and communities to create healthier environments for future generations.

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