Weighing Scales
Obesity affects roughly 42% of U.S. adults, according to the Centers for Disease Control and Prevention (CDC). And about two-thirds of Americans (65%) say willpower alone usually isn’t enough for most people who are trying to lose weight and keep it off, according to a new Pew Research Center survey.
Put those two facts together, and it should come as no surprise that a new class of drugs to help people lose weight – including Ozempic, Wegovy and similar medications – has soared in popularity. In the Center survey, about three-quarters of Americans say they have heard or read at least a little about these drugs.
Obesity patterns in the U.S. and abroad
Over the past three decades, the share of Americans categorized as obese (based on body mass index, or BMI, data from the CDC) has risen considerably.
In 2017-18 – the timespan with the most recent data available – about three-quarters of U.S. adults ages 20 and older were considered either overweight (31%) or obese (42%). Just over 9% of adults were considered severely obese. (Note that the CDC survey period spans two years.) About three decades earlier, by comparison, 56% of Americans ages 20 and older were considered overweight or obese, including 3% who were considered severely obese.
The COVID-19 pandemic disrupted the CDC’s data collection, which is why the most recent figures are from 2017-18. However, there’s some evidence from other federal agencies that adult obesity rates rose even higher during the pandemic.
The CDC classifies someone as “overweight” if they have a BMI of 25.0 to 29.9, and “obese” if they have a BMI of 30.0 or greater. People whose BMI is 40.0 or greater are sometimes categorized as “severely obese.” The CDC has more information about BMI, its uses and how to calculate it.
While clinicians and researchers use BMI as a population-level metric and as an individual screening tool to identify potential weight problems, many now advise that BMI alone is an incomplete measure of health. In 2023, for instance, the American Medical Association (AMA) urged doctors to consider additional factors when assessing obesity and health risks, such as body composition, waist circumference and genetic factors. The AMA also noted that health risks differ both between and within demographic groups, and that BMI cutoffs were “based primarily on data collected from previous generations of non-Hispanic White populations and [do] not consider a person’s gender or ethnicity.”
The United States had one of the highest adult obesity rates in the world as of 2016, the most recent year for which the World Health Organization (WHO) has comprehensive data. That year, the U.S. ranked 12th among 191 countries. (Note that the WHO defines adults as those 18 and older, so its figures aren’t directly comparable with the CDC data.)
Worldwide, obesity affected about 663 million adults, or 13% of the global adult population, in 2016. Global obesity rates were 15% for women and 11% for men, based on Center estimates of WHO and World Bank data.
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