Obesity in America vs. Other Countries: What the Statistics Reveal

Why does obesity affect so many Americans while some countries report much lower rates? The answer reaches beyond personal discipline. What we can afford, how our communities are built, and the food available around us all influence our health. At Oowee Mobile Nutrition & Wellness, we believe understanding these patterns is a starting point for change without shame.

The numbers: America and other countries

The CDC’s National Health and Nutrition Examination Survey found that 40.3% of U.S. adults age 20 and older had obesity during August 2021–August 2023. Severe obesity affected 9.4%. These estimates use measured height and weight. [1]

For an international view, OECD’s Health at a Glance 2025 reports that, across 13 countries with measured data, an average 26% had obesity and 60% had overweight or obesity. In the United States, Mexico and Finland, overweight or obesity affected at least 70%; in Japan and Korea, it affected less than 40%. These figures refer to 2023 or the nearest available year, generally for ages 15 and older. [2]

Read those numbers carefully: overweight or obesity is not the same as obesity alone. Countries differ in survey years and age coverage. Self-reported weight also tends to produce lower estimates than direct measurements. These are useful comparisons, not a perfectly matched ranking. Obesity is commonly defined as BMI of at least 30; BMI is a population screening tool, not a complete picture of an individual’s health. [2]

What is contributing to the problem?

1. A food environment built around convenience. A 2025 CDC report found that ultra-processed foods supplied 53.0% of calories for U.S. adults age 19 and older and 61.9% for children and teens ages 1–18 during August 2021–August 2023. Those percentages describe dietary intake, not the percentage of obesity caused by these foods. [3]

In a small NIH controlled trial, 20 adults ate each of two diets for two weeks. Participants consumed about 500 extra calories a day on the ultra-processed diet and gained about two pounds on average; they lost a similar amount on the minimally processed diet. The study supports a causal effect of the diets tested, but its size and duration cannot explain every country’s obesity rate. It also does not mean every packaged food has the same nutritional value. [4]

2. Opportunities for movement. Jobs, transportation and neighborhood design shape everyday activity. CDC identifies inactivity and limited access to safe places to move as risk factors. A community that makes walking to everyday destinations practical offers different opportunities than one where most trips require a car. [5]

3. Affordability and access. Food budgets, transportation, safe housing and economic stability affect what changes people can sustain. OECD describes a relationship between lower income and higher obesity risk, partly through environments that encourage energy-dense diets and sedentary routines. [2,5]

4. Sleep, stress and biology. Poor sleep, long-term stress, genetics, certain health conditions and some medications can contribute to weight gain. Two people following similar routines may have different experiences. Blaming someone’s character misses these realities. [5]

What can we learn from the differences?

Lower national rates do not prove that one traditional food, supplement or policy is the answer. Country-level statistics cannot assign an exact share of the gap to food, movement or any other factor. They give us reasons to examine the environments and routines that make nourishing choices easier.

A practical Oowee approach

Start with changes that fit your life: build meals around vegetables, beans, whole grains and other satisfying, fiber-rich foods; make water your everyday drink; plan a few convenient meals; create regular opportunities for movement; and protect time for rest. Frozen vegetables, canned beans and plain oats can make nourishing meals more affordable.

Fresh juice can fit into a balanced eating pattern, with attention to portion size and total intake. Whole fruits and vegetables remain valuable for their fiber. No juice, shot, cleanse or supplement is a stand-alone solution to obesity.

Oowee’s message is simple: nourish with intention, build sustainable habits, and treat yourself with dignity along the way. Explore Oowee Mobile Nutrition & Wellness at www.ooweedrinks.com. Fueling Individuals’ Wellbeing, The Holistic Way.

Sources and data notes

Published October 27, 2026. Survey dates are stated above; publication dates are not the same as data-collection dates.

[1] CDC/NCHS, Data Brief 508 (2024): https://www.cdc.gov/nchs/products/databriefs/db508.htm

[2] OECD, Health at a Glance 2025, Overweight and obesity: https://www.oecd.org/en/publications/2025/11/health-at-a-glance-2025_a894f72e/full-report/overweight-and-obesity_0bf9c422.html

[3] CDC/NCHS, Data Brief 536 (2025): https://www.cdc.gov/nchs/products/databriefs/db536.htm

[4] NIH, controlled diet trial (2019): https://beta.nih.gov/news-and-media/news/nih-study-finds-heavily-processed-foods-cause-overeating-and-weight-gain

[5] CDC, Risk Factors for Obesity (2025): https://www.cdc.gov/obesity/risk-factors/risk-factors.html