As of 2022, the worldwide prevalence of adult obesity has more than doubled since 1990, with 43% of adults aged 18 and over now classified as overweight. That figure includes both overweight and obese individuals, measured using BMI (a ratio of weight to height). The rate of obesity specifically has also more than doubled over the same period, making it one of the fastest-growing health challenges on the planet.
How the Numbers Have Changed Since 1990
In 1990, 25% of adults worldwide were overweight. By 2022, that number had jumped to 43%. The increase wasn’t gradual and then leveling off. It has been steady and accelerating, driven by shifts in food systems, physical activity levels, and urbanization across virtually every region.
The trend is even more striking among children and adolescents. In 1990, just 8% of young people aged 5 to 19 were overweight or obese. By 2022, that figure had reached 20%. Childhood obesity alone quadrupled during that window, rising from 2% (about 31 million young people) to 8% (over 160 million).
Childhood Obesity Is Growing Fastest
The sharpest acceleration in obesity rates is happening among children. Over 160 million young people aged 5 to 19 now live with obesity globally, a fivefold increase in raw numbers since 1990. This matters because childhood obesity tends to persist into adulthood, raising the lifetime risk of heart disease, type 2 diabetes, joint problems, and certain cancers.
Projections from the World Obesity Federation suggest that without meaningful intervention, childhood obesity rates could double again by 2035. Among boys, rates are expected to climb from 10% to 20%, and among girls from 8% to 18%. These projections reflect current trajectories, not worst-case scenarios.
Where Obesity Rates Are Highest
Obesity does not affect every country or region equally. In the United States, data from the CDC shows that the Midwest (35.9%) and South (34.5%) carry the highest adult obesity rates, compared to the West (30.2%) and Northeast (30.3%). Two states, Mississippi and West Virginia, along with Guam, have adult obesity rates at or above 40%. Only eight states and the District of Columbia fall below 30%.
Globally, small Pacific Island nations like Nauru, Palau, and Tonga consistently report the highest obesity rates in the world, often exceeding 50% of their adult populations. Wealthier countries in the Middle East, North America, and parts of Europe also rank high. The lowest rates tend to be found in parts of South and Southeast Asia and sub-Saharan Africa, though those regions are now seeing rapid increases as diets shift toward processed foods and sugary drinks.
Rural Communities Are Not Spared
There’s a common assumption that obesity is primarily an urban problem tied to sedentary office work and fast food. The data tells a more complicated story. A nationally representative U.S. survey of over 23,000 children and adolescents found that rural children were significantly more likely to be overweight or obese than their urban peers: 37.6% versus 32.1%. After adjusting for factors like income and demographics, rural children still had 30% higher odds of being overweight or obese.
This pattern reflects limited access to grocery stores with fresh produce, fewer safe spaces for physical activity, and higher rates of poverty in rural areas. Internationally, a similar rural-urban convergence is happening. Countries that once saw obesity concentrated in cities are now seeing rates climb in rural populations as processed foods become cheaper and more available.
The Economic Scale of the Problem
The World Obesity Federation projects that the global cost of overweight and obesity will reach $4.32 trillion per year by 2035. That figure includes direct healthcare costs like medications and surgeries, but also lost productivity, disability, and premature death. By 2035, the federation estimates that more than half of the global population, 51%, will be living with overweight or obesity if current trends continue.
That projection reframes obesity from an individual health issue to an economic one. Countries with rapidly rising rates, particularly low- and middle-income nations, face the prospect of healthcare systems overwhelmed by chronic diseases linked to excess weight before they’ve fully addressed infectious disease burdens.
How Obesity Is Measured
The global statistics above rely on BMI, which divides your weight in kilograms by your height in meters squared. A BMI of 25 or above is classified as overweight. A BMI of 30 or above is classified as obese. These thresholds, set by the WHO, are the standard used in virtually all international obesity tracking.
BMI is a blunt tool. It doesn’t distinguish between muscle and fat, and it doesn’t account for where fat is stored on the body. A muscular athlete and a sedentary person of the same height and weight get the same BMI score. Despite these limitations, BMI remains the primary measure for population-level tracking because it’s simple, inexpensive, and allows comparisons across countries and decades. Some health organizations now recommend also measuring waist circumference, which better captures the visceral fat around organs that drives the most health risk.