TOP 10 Countries by Adult Obesity Prevalence (2025)
Adult Obesity Prevalence: Highest Country Rates in the Latest WHO Snapshot
Adult obesity prevalence measures the share of adults with a body mass index of 30 kg/m² or higher. The indicator is used to compare population-level obesity risk across countries because it follows a consistent BMI threshold and is published through international health datasets.
Thank you for reading this post, don't forget to subscribe!This ranking uses the World Health Organization Global Health Observatory indicator processed by Our World in Data. The source was last updated on May 19, 2025, and the latest available values in the series are for 2022. For a 2025 ranking page, this is the latest comparable actual-data snapshot, not a newly measured 2025 survey round.
Values are shown as a percentage of adults aged 18 and older. The ranking compares prevalence, not the absolute number of adults living with obesity. Smaller countries can rank very high by percentage while contributing fewer total cases than larger countries with lower prevalence.
Tonga leads the latest comparable WHO/Our World in Data country snapshot.
The simple average across the ten listed entries is above half of the adult population.
Pacific island countries dominate the upper end of the prevalence ranking.
The ranking shows the share of adults affected, not the number of adults affected.
What the upper end of the ranking shows
The highest adult obesity rates are concentrated in small island states, especially in the Pacific. Tonga, Nauru, Tuvalu and Samoa form a top cluster above 60%, well separated from the rest of the Top 10. The pattern reflects more than personal behaviour: food imports, local food availability, price structures, built environments, transport habits and prevention capacity all shape national obesity prevalence.
The Bahamas, the Marshall Islands, Saint Kitts and Nevis, Kiribati, Micronesia and Kuwait occupy the next tier, with values around the mid-40s to high-40s. These are still very high levels by international standards. Kuwait’s presence also shows that the issue is not limited to island economies; some high-income Gulf countries face similar pressure from dietary change, sedentary lifestyles and metabolic-risk trends.
Top 10 countries by adult obesity prevalence
The table ranks country-level entries by the percentage of adults aged 18+ with BMI ≥ 30. Values are rounded to whole percentage points for readability.
| Rank | Country / territory | Adult obesity prevalence | Region note |
|---|---|---|---|
| 1 | Tonga | 71% | Pacific island state |
| 2 | Nauru | 70% | Pacific island state |
| 3 | Tuvalu | 64% | Pacific island state |
| 4 | Samoa | 61% | Pacific island state |
| 5 | Bahamas | 48% | Caribbean |
| 6 | Marshall Islands | 47% | Pacific island state |
| 7 | Saint Kitts and Nevis | 47% | Caribbean |
| 8 | Kiribati | 46% | Pacific island state |
| 9 | Micronesia | 46% | Pacific island state |
| 10 | Kuwait | 45% | Middle East / Gulf |
Source: World Health Organization Global Health Observatory, processed by Our World in Data. Indicator: percentage of adults aged 18+ with BMI ≥ 30 kg/m². Source update: May 19, 2025. Latest values in the series: 2022.
Chart: adult obesity prevalence across the Top 10
The chart makes the distribution easier to read: the first four countries sit above 60%, while the remaining six are clustered between 45% and 48%.
Methodology
Indicator logic
Adult obesity prevalence is calculated as the number of adults with BMI ≥ 30 divided by the adult population, multiplied by 100. BMI is calculated as body weight in kilograms divided by height in meters squared. The threshold is useful for population surveillance because it can be applied consistently across countries.
Data year and snapshot choice
The ranking uses the WHO Global Health Observatory obesity indicator as processed by Our World in Data. The data page was updated in May 2025 and covers 1990–2022. Because the latest comparable actual values are for 2022, the page treats them as the latest available evidence for a 2025 comparison rather than mixing actual observations with separate projections.
Rounding and limitations
Values are rounded to whole percentage points. The table includes the ten highest country-level entries in the selected source view. BMI does not directly measure body composition, waist circumference, ethnicity-specific metabolic risk or individual medical history. Small-country estimates can also be more sensitive to survey design and modelling choices, so close rankings should not be over-interpreted.
Insights from the adult obesity ranking
The top cluster is geographically concentrated
Pacific island states dominate the highest positions. This points to shared structural pressures in food systems, mobility patterns and prevention capacity rather than isolated national anomalies.
Prevalence and total burden are different
Tonga and Nauru rank very high by percentage, but larger countries with lower prevalence can still have far more adults living with obesity in absolute numbers.
The middle of the Top 10 remains very high
A value near 46% or 47% may look lower than the leaders, but it still means nearly half of the adult population is classified as obese by the BMI threshold.
Kuwait reflects a wider Gulf challenge
Kuwait’s position shows how high-income settings can face elevated obesity prevalence when calorie-dense diets, car-oriented urban life and sedentary routines converge.
What this means for readers
For health systems, high adult obesity prevalence signals future pressure on diabetes care, cardiovascular treatment, kidney disease management, cancer prevention and primary-care capacity. The public-health response cannot rely only on individual advice; prevention depends on food environments, school meals, active transport, clinical screening and affordable access to healthier choices.
For analysts, the ranking is most useful when paired with population size, age structure, healthcare access and trend direction. Prevalence explains how widespread obesity is inside a country. Absolute counts explain the scale of service demand. Both views are needed for budgeting, prevention planning and risk assessment.
FAQ
What does adult obesity prevalence mean?
It is the percentage of adults with BMI of 30 kg/m² or higher. It is a population indicator, not a complete medical assessment of each individual.
Is this ranking based on measured 2025 surveys?
No. The source was updated in 2025, but the latest comparable actual values in the selected WHO/Our World in Data series are for 2022. The ranking is therefore a latest-available-data snapshot for 2025 publication use.
Why do Pacific island countries rank so high?
Several island states face a combination of imported food dependence, limited local food-system diversity, changing diets, lower daily physical activity and constrained prevention resources. These pressures can produce very high prevalence rates.
Does BMI ≥ 30 mean the same health risk in every population?
Not exactly. BMI is practical for international surveillance, but it does not capture body composition, fat distribution, ethnicity-specific risk or individual medical history. It should be interpreted as a population-level measure.
Why can a small country rank high but have fewer total cases?
The ranking is based on percentages. A small country can have a very high share of adults with obesity while having fewer total adults affected than a large country with a lower percentage.
Which source is strongest for comparing countries?
WHO Global Health Observatory and NCD-RisC are the strongest starting points because they use harmonised international definitions and modelling methods. Our World in Data is useful for transparent access, metadata and chart-ready country comparisons.
Sources
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World Health Organization — Global Health Observatory
Used for the official definition of obesity among adults: percentage of adults aged 18+ with BMI ≥ 30 kg/m², based on measured height and weight and NCD-RisC methods.
https://www.who.int/data/gho/data/indicators/indicator-details/GHO/prevalence-of-obesity-among-adults-bmi-%3D-30-%28age-standardized-estimate%29-%28-%29 -
Our World in Data — Share of adults who are obese
Used for the accessible WHO-processed country values, source update date, unit, date range and metadata.
https://ourworldindata.org/grapher/share-of-adults-defined-as-obese -
NCD Risk Factor Collaboration — Adult BMI visualisations
Used for methodological context on BMI, obesity prevalence and international comparison of adiposity indicators.
https://www.ncdrisc.org/data-visualisations-adiposity.html -
World Obesity Atlas 2025
Used for broader context on obesity as a driver of non-communicable disease risk and health-system pressure.
https://data.worldobesity.org/publications/?cat=23
