Women have slightly higher obesity rates than men, both globally and in the United States. Worldwide, about 16% of adults were living with obesity in 2022. In the U.S., 41.3% of women and 39.2% of men were obese between 2021 and 2023. The gap widens significantly at the most extreme end: 11.5% of American women have severe obesity (a BMI of 40 or higher) compared to 6.9% of men.
Global and U.S. Numbers
The World Health Organization reported that in 2022, over 890 million adults worldwide were living with obesity. Overweight rates (which include obesity) were nearly identical between the sexes: 43% of men and 44% of women. That’s a dramatic jump from 1990, when just 25% of adults overall were overweight.
In the United States, the picture is sharper. CDC data from 2021 to 2023 puts the overall adult obesity rate at 40.3%, with women about two percentage points ahead of men. But the real divergence shows up in severe obesity. Women are roughly 67% more likely than men to have a BMI over 40, a category that carries substantially higher risks for heart disease, diabetes, and joint problems.
Where Fat Is Stored Matters More Than How Much
Men and women don’t just differ in how much fat they carry. They differ in where it goes, and that distinction has major health consequences. Men tend to accumulate visceral fat, the deep abdominal fat that surrounds internal organs. Women preferentially store fat subcutaneously, meaning just beneath the skin, particularly around the hips, thighs, and buttocks.
Visceral fat is the more metabolically dangerous type. It releases inflammatory signals and is closely linked to insulin resistance, type 2 diabetes, and cardiovascular disease. This is why men at the same BMI as women often face worse metabolic outcomes. A man with a BMI of 32 may carry more internal organ fat than a woman at the same number, even though both are classified identically as “obese.”
Here’s the twist: when women do accumulate visceral fat, the health consequences can be disproportionately severe. Research published in Diabetes & Metabolism Journal found that the risk of developing type 2 diabetes jumped dramatically in women with high levels of visceral fat. Women in the highest category of visceral fat had more than 32 times the odds of developing diabetes compared to those in the lowest category. For men, the same comparison yielded about 2.6 times the odds. In other words, women are generally protected from visceral fat buildup, but when that protection fails, the metabolic fallout is steep.
Hormones Drive the Difference
Estrogen is the primary reason women store fat differently than men. It actively directs fat toward subcutaneous depots and away from visceral storage. This protective pattern holds through the reproductive years but shifts after menopause, when estrogen levels drop and women begin accumulating more visceral fat. Studies on women who have had hysterectomies show a similar shift toward visceral fat and increased insulin resistance.
Testosterone plays the opposite role. It restrains fat accumulation overall, limiting both visceral and subcutaneous fat expansion by keeping individual fat cells smaller and blocking the creation of new ones. When testosterone is low, as in men with hypogonadism, fat mass increases and glucose metabolism worsens. Animal research has shown that restoring testosterone to castrated mice rescues them from diet-induced fat gain, confirming that the hormone actively suppresses fat growth rather than simply correlating with leanness.
The interplay is more nuanced than “estrogen equals less fat.” Testosterone is partially converted into estrogen in the body, and that estrogen selectively blocks visceral fat. Meanwhile, another testosterone-derived hormone selectively blocks subcutaneous fat. So men’s hormonal environment simultaneously suppresses fat in multiple depots, which helps explain why average-weight men carry less total body fat than average-weight women (typically 15 to 20% versus 25 to 30%).
BMI Doesn’t Tell the Full Story
Nearly all obesity statistics rely on BMI, which is simply weight divided by height squared. It doesn’t distinguish between muscle and fat, and it doesn’t account for where fat is stored. This creates real blind spots. Young men with significant muscle mass can be classified as overweight or obese despite having low body fat. Older adults of both sexes can have a “normal” BMI while carrying dangerous amounts of visceral fat because they’ve lost muscle with age.
BMI also tends to underestimate obesity in certain populations of women while overestimating it in others. Because women naturally carry more body fat at any given BMI, a woman and a man with identical BMIs can have very different metabolic risk profiles. Some researchers have argued that BMI thresholds should be sex-specific, but current clinical guidelines use the same cutoffs for everyone.
Socioeconomic Patterns Differ by Sex
The relationship between income, education, and obesity plays out differently for men and women, and the direction flips depending on the country. In high-income nations, lower socioeconomic status is more strongly associated with obesity in women than in men. A study from northern Sweden found that the prevalence of overweight was actually higher in men (64%) than in women (52%), but that low education and low income were significant contributors to the gap. Women in the lowest income bracket and those with less education were disproportionately affected.
Multiple factors likely explain this. Access to affordable nutritious food, time for physical activity, and levels of chronic stress all track with income, and these pressures often land harder on women who serve as primary caregivers. Marketing of processed foods, neighborhood walkability, and access to healthcare all vary by socioeconomic status in ways that shape weight over decades.
Weight Loss Response by Sex
If you’re wondering whether men or women have an easier time losing weight, the answer is complicated. Men often lose more weight in absolute terms during clinical programs, but that’s largely because they start heavier. When weight loss is expressed as a percentage of starting body weight, women frequently come out ahead. One prospective study found women reduced their body weight by about 2.7 percentage points more than men in a 12-month online program. Another trial showed women lost 5.3% of body weight compared to 3.4% for men.
That said, some studies show the opposite, particularly in interventions focused on dietary changes and increased physical activity, where men’s higher baseline muscle mass gives them a metabolic advantage in burning calories. The honest summary is that both sexes lose meaningful amounts of weight in structured programs, and individual variation within each sex is far larger than the average difference between them.