World Obesity Day is observed every year on 4 March to draw global attention to obesity as a serious, chronic health condition rather than a mere lifestyle choice or cosmetic issue. The day is coordinated by the World Obesity Federation and its partners, with support from the World Health Organization (WHO) and many national health bodies.
Why it matters
Obesity is closely linked to type 2 diabetes, high blood pressure, heart attacks, stroke, fatty liver disease, some cancers, joint problems and sleep apnea. It can also affect mental health by increasing anxiety, low self-esteem and depression. Around the world, more people are now living with overweight or obesity than underweight, including in low- and middle-income countries. Unhealthy diet, lack of physical activity, urbanisation, marketing of ultra-processed foods and sugary drinks, and limited access to safe spaces for exercise all contribute to rising obesity rates. World Obesity Day reminds governments, health professionals and communities that obesity is preventable and treatable, and that people living with obesity deserve support, not blame.
History
The World Obesity Federation first launched World Obesity Day in the early 2010s to strengthen advocacy around obesity and its links to noncommunicable diseases (NCDs). Initially observed on different dates, the day was later fixed on 4 March and relaunched globally in 2020 with the theme of uniting action to address the root causes of obesity. Campaigns focus on improving food environments, regulating marketing to children, making healthier options affordable, training health workers to diagnose and manage obesity, and reducing weight-related stigma. By recognising obesity as a complex disease influenced by biology, environment and social factors, World Obesity Day encourages comprehensive solutions beyond simply telling people to "eat less and move more".
Key facts
Definition
- obesity is usually defined using body mass index (BMI); for adults
- a BMI of 30 or above is considered obese
- and for many Asian populations
- health risks start to rise from a BMI of around 23–25.
Main drivers
- high intake of energy-dense
- ultra-processed foods and sugary drinks
- physical inactivity
- long sitting hours
- poor sleep
- stress and certain medications or medical conditions.
Health impact
- increased risk of type 2 diabetes
- high blood pressure
- heart disease
- stroke
- fatty liver
- kidney disease
- osteoarthritis and some cancers.
Children and adolescents
- childhood obesity is growing worldwide
- setting children up for lifelong health problems if not addressed early.
Stigma
- weight bias and teasing can stop people from seeking care; respectful
- non-judgmental support is essential for effective treatment.
In Bangladesh
In Bangladesh, rapid urbanisation, changing food habits and reduced physical activity have led to a steady rise in overweight and obesity, especially in cities but increasingly in rural areas as well. Many people regularly consume deep-fried snacks, fast food, refined carbohydrates and sugary drinks, while spending long hours sitting at desks, in vehicles or in front of screens. This has contributed to a surge in diabetes, hypertension, heart disease and fatty liver disease. On World Obesity Day, health authorities, professional societies and media in Bangladesh promote messages on balanced diets, home-cooked meals with vegetables and fruits, portion control, regular walking or exercise, and limiting screen time for children. There is growing emphasis on school-based health education, creating safe spaces for physical activity, workplace wellness programmes, and integrating obesity prevention into national NCD strategies. The day also highlights that people living with obesity should not be shamed, but supported with proper counselling, medical check-ups and, when needed, specialist care.
Frequently asked questions
- What is obesity?
- Obesity is a chronic health condition where excess body fat has built up to the point that it may harm health. It is usually assessed by body mass index (BMI), waist circumference and related health risks.
- Is obesity common in Bangladesh?
- Yes. Overweight and obesity are increasing in both urban and rural areas of Bangladesh, especially among adults and school-age children, and are contributing to higher rates of diabetes, high blood pressure and heart disease.
- How can obesity be prevented?
- Obesity can be prevented by eating a balanced diet rich in vegetables, fruits and whole grains; limiting fried and ultra-processed foods and sugary drinks; staying physically active at least 150 minutes per week; sleeping well; and having regular health check-ups to monitor weight, blood pressure and blood sugar.