The health risks associated with obesity are many; they include an overall increased risk of death from all causes, hypertension, type 2 diabetes, heart disease, stroke, osteoarthritis, and mental illness.
Because obesity is associated with such a wide range of health issues, understanding the numbers behind this trend is more important than ever.
Currently, about 36 percent of American adults are obese — more than 1 in 3. And, globally, more than 1 in 10 humans are obese.
In this article, we look at the facts and figures behind obesity in America and the world at large, including breakdowns by states, countries, age, and sex.
Obesity is often split into three classes.
Obesity is further split into:
- class 1 obesity: BMI 30–34
- class 2 obesity: BMI 35–39
- class 3 ("extreme" or "severe") obesity: BMI 40 or higher
In children, overweight and obesity is defined according to the CDC's growth charts. For children and adolescents aged 2–19:
- 85th percentile or above: Overweight
- 95th percentile or above: Obese
- at or above 120 percent of the 95th percentile: Extreme obesity
Obesity statistics: United States
These figures come from the National Health and Nutrition Examination Survey (NHANES) carried out by the National Center for Health Statistics (NCHS):
- overweight: 38.7 percent
- obesity (including extreme obesity): 35 percent
- extreme obesity: 5.5 percent
- overweight: 26.5 percent
- obesity (including extreme obesity): 40.4 percent
- extreme obesity: 9.9 percent
Obesity by ethnicity
Obesity does not impact all races equally in the U.S. The following give the percentage of obese adults in each group:
- non-Hispanic blacks — 48.1 percent
- Hispanics — 42.5 percent
- non-Hispanic whites — 34.5 percent
- non-Hispanic Asians — 11.7 percent
Obesity by age
Obesity is not split evenly across all age groups:
- 20–39 — 32.3 percent
- 40–59 — 40.2 percent
- 60 or over — 37.0 percent
Obesity in children
A paper, published in JAMA in 2016, took measurements from 40,780 children and adolescents, aged 2-19 between 2013 and 2014. Over all, 17 percent were obese and 5.8 percent had extreme obesity.
Breaking the age groups down further:
- Age 2–5 years — 9.4 percent obese and 1.7 percent extreme obesity.
- Age 6–11 years — 19.6 percent obese and 4.3 percent extreme obesity.
- Age 12-19 years — 20.6 percent obese and 9.1 percent extreme obesity.
Obesity rates by state
Colorado state has the lowest obesity rates in the U.S.
1. West Virginia — 37.7 percent
2. Mississippi — 37.3 percent
3. Alabama — 35.7 percent
4. Arkansas — 35.7 percent
5. Louisiana — 35.5 percent
States with the lowest obesity rates were:
47. California — 25.0 percent
48. Hawaii — 23.8 percent
49. Massachusetts — 23.6 percent
50. District of Columbia — 22.6 percent
51. Colorado — 22.3 percent
Obesity and socioeconomic status
In men, no link has been found between education level and obesity. However, in women, those with college degrees are less likely to be obese than those without.
Similarly, women with a higher income are less likely to be obese than women with lower incomes.
Conversely, in non-Hispanic black and Mexican-American men, individuals with a higher income are more likely to be obese than those earning a low income.
The cost of obesity
Aside from the obvious dangers to health, obesity is incredibly costly in a financial sense. In 2008, the annual medical cost was estimated to be $147 billion.
People who were obese had average medical costs $1,429 more than those of a normal weight.
Obesity statistics: Global
Historically, obesity has been considered a problem in high-income countries. However, obesity in low- and middle-income countries is on the rise, especially in urban areas.
Some of these countries are facing what the World Health Organization (WHO) describes as a double burden of disease:
"It is not uncommon to find undernutrition and obesity co-existing within the same country, the same community, and the same household."
According to the WHO, on a global basis, obesity has almost tripled since 1975. Over the same period of time, in the 5–19 age bracket, obesity has risen from less than 1 percent to 7 percent. They write, "Most of the world's population live in countries where overweight and obesity kills more people than underweight."
In 2016, more than 1.9 billion adults (39 percent) were overweight and, of these, more than 650 million (13 percent) were obese.
Global figures by sex:
- Overweight — 39 percent of men, 40 percent of women.
- Obese — 11 percent of men, 15 percent of women.
Children and obesity
Obesity is a growing concern, globally.
- In Africa, the number of children under 5 who are overweight has increased almost 50 percent since 2000.
- Nearly half of all overweight or obese children under 5 live in Asia.
- Globally, 41 million children under 5 are overweight.
- 340 million aged 5–19 are overweight or obese.
Obesity rates by country
According to the WHO, Vietnam has the lowest rates of obesity.
1. Nauru — 61 percent
2. Cook Islands — 55.9 percent
3. Palau — 55.3 percent
4. Marshall Islands — 52.9 percent
5. Tuvalu — 51.6 percent
6. Niue — 50 percent
7. Tonga — 48.2 percent
8. Samoa — 47.3 percent
9. Kiribati — 46 percent
10. Micronesia — 45.8 percent
11. Kuwait — 37.9 percent
12. United States — 36.2 percent
The high rates of obesity found in the Pacific Islands are predominantly due to a shift away from traditional diets toward imported foods from countries such as China, Malaysia, and the Philippines.
"Promotion of traditional foods has fallen by the wayside. They are unable to compete with the glamour and flashiness of imported foods."
Dr. Temo K. Waqanivalu, WHO technical officer, Fiji
The lowest obesity rates were measured in:
1. Vietnam — 2.1 percent
2. Bangladesh — 3.6 percent
3. Timor-Leste — 3.8 percent
4. India — 3.9 percent
5. Cambodia — 3.9 percent
6. Nepal — 4.1 percent
7. Japan — 4.3 percent
8. Ethiopia — 4.5 percent
9. Republic of Korea — 4.7 percent
10. Eritrea — 5 percent
11. Sri Lanka — 5.2 percent
12. Uganda — 5.3 percent
13. Madagascar — 5.3 percent
Obesity and overweight are significant issues that are worsening across much of the planet. It is important to note that obesity-related conditions are among some of the leading causes of death, yet obesity is almost always preventable.