Ranked: Top 10 Most Obese Countries in the World

Key Takeaways

• American Samoa leads the world with a staggering obesity rate of 70.3%, meaning nearly 3 in every 4 people are classified as obese
• 8 of the 10 most obese countries are small Pacific island nations, indicating a clear geographic and cultural pattern.
• The United States is the only large continental nation in the top 10, with an obesity rate of 41.6%
• High income does not protect against obesity. American Samoa, Nauru, French Polynesia, and the United States are all classified as high income economies.
• The data covers adults and is drawn from a landmark 2023 Lancet study analyzing 222 million people across 3,663 population-representative studies.

The dominance of Pacific island nations at the top of the global obesity rankings is not accidental. Researchers have linked high obesity rates in these nations to a combination of factors including the widespread replacement of traditional diets with imported processed foods, limited physical infrastructure for activity, and genetic predispositions to weight gain that may have historically been adaptive in island environments where food scarcity was a recurring reality.

Nauru is a particularly striking case. Once one of the wealthiest nations per capita in the world due to phosphate mining, the country underwent a dramatic dietary shift in the latter half of the 20th century as Western processed foods replaced traditional staples. The obesity epidemic followed closely.

The United States at #10 stands apart from the rest of the list. Unlike the small island nations above it, the US has a population of 330 million, making its 41.6% obesity rate a public health crisis of enormous scale in absolute terms.

Data Source: NCD RisC Collaboration, via World Obesity Federation

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