Childhood obesity rising globally

Childhood obesity is rising at an alarming rate worldwide, underscoring the urgency of this year’s World Obesity Day theme: “8 Billion Reasons to Act.”

Observed annually on March 4, World Obesity Day raises awareness about obesity, its health risks and the need for prevention and treatment. The 2026 campaign emphasizes that with more than 8 billion people globally, there are 8 billion reasons to prioritize action against obesity as a public health crisis, the Heratsi Research Center reports.

Health experts stress that obesity is not merely a cosmetic concern but a complex, chronic disease driven by hormonal, genetic, behavioral and environmental factors. If left untreated, it can lead to serious complications, including Type 2 diabetes, cardiovascular disease, fatty liver disease, osteoarthritis, sleep apnea, infertility and certain cancers.

Obesity is diagnosed through clinical assessment, including body mass index, waist circumference and metabolic evaluation. A BMI of 40 or higher is classified as severe, or morbid, obesity. Medical intervention is typically considered when BMI reaches 35 with related health conditions, or 40 without them.

The condition affects all age groups. Since 1975, obesity rates among school-age children have increased nearly fivefold, particularly in low- and middle-income countries. More than 400 million children and adolescents were living with overweight or obesity in 2025, according to global estimates.

Currently, more than 1 billion people worldwide live with obesity. Nearly 1 billion people, including more than 400 million school-age cchildrn, are affected by overweight or obesity, and projections suggest that figure could reach 4 billion by 2035. By then, more than half of the world’s population is expected to live with overweight or obesity.

Each year, an estimated 1.7 million premature deaths from noncommunicable diseases are linked to excess weight. The global economic burden of overweight and obesity is projected to reach $3.23 trillion by 2030.

Experts say childhood obesity often persists into adulthood, significantly increasing the risk of chronic, noncommunicable diseases later in life.

Contributing factors include poverty, stigma, unequal access to education and health care, limited availability of nutritious food and environments that discourage physical activity.

Prevention begins with sustainable lifestyle changes and routine health monitoring. Recommended measures include a balanced diet, regular physical activity, limiting unhealthy foods, adequate sleep, stress management and regular medical checkups.

Health advocates say the 2026 observance serves as a call to action for individuals, communities and governments worldwide to address one of the most pressing public health challenges of the century.