World Obesity Day 2026 - March 04

World Obesity Day takes place on 4 March 2026, bringing together everyone who is affected by overweight and obesity – all 8 billion of us - with a particular focus on our most vulnerable communities: children. The reason is simple: childhood obesity is rising rapidly, with the prevalence among school-aged children increasing from 4% in 1975 to almost 20% in 2022. The rise is sharpest in low- and middle-income countries. Obesity in childhood often continues into adulthood, increasing the risk of serious non-communicable diseases (NCDs) such as diabetes, heart disease, and certain cancers. Concerningly, early signs of chronic diseases are already appearing in children today. Obesity doesn’t occur in isolation. Poverty, stigma, unequal access to education and treatment, limited availability of healthy food, and environments that do not support healthy living all contribute to rising childhood obesity and the risk of disease later in life. Today, almost 3 billion people including 159 million children are living with overweight and obesity, and that number is projected to rise to 4 billion by 2035

– putting even more people at risk of NCDs.

Why 8 Billion Reasons?

Projections show that four billion people - half the global population - are expected to be living with overweight and obesity by 2035. But in reality, obesity at that scale affects all of society. It means every community is touched by the noncommunicable diseases to which obesity is a major contributor. More than that, obesity is an indicator of systems that aren’t working. And the spread of childhood obesity in low-and- middle income countries shows that health inequalities are widening. The measures we take to prevent and treat obesity will benefit every single one of us. That’s why there are eight billion reasons to take part in World Obesity Day. Every one of us has a role to play in creating a world where obesity is understood rather than stigmatised – a world that prioritises prevention from the earliest years, supports people living with obesity, centers their voices, ensures equitable access to care, and builds systems that support healthier lives.

Call to Action

On World Obesity Day 2026, we can all ask ourselves what we can do to address obesity in our communities, for example by contributing to health promoting activities and destigmatising the disease. At a personal level, we can raise awareness, challenge weight-based stigma, and spark conversations at home, school, work, or online, including through initiatives like making the ‘O’ for Obesity. In our communities, we can organise and join events like Walk for WOD, illuminate monuments, and support families, children, and communities to create healthier, more inclusive environments while centering the voices of lived experience in our events and communications. At a policy and systemic level, we can advocate for stronger health, food, and environment policies, promote equitable access to care and nutritious food, write to decision-makers to demand highlevel change, and ensure meaningful engagement of Lived Experience to drive systemic change. By acting across all levels – from the personal to the systemic – we can change the story of obesity and build a healthier, fairer world for everyone.