Women Lose 60% More Weight on GLP-1s Than Men
A Johns Hopkins analysis published in JAMA Internal Medicine found women lost an average of 11% body weight versus 7% for men. But the drugs work equally well across age, race, and starting weight.
If you've wondered whether GLP-1 medications work equally well for everyone, a large meta-analysis from Johns Hopkins provides some of the clearest answers yet — including one surprising finding about sex differences. Johns Hopkins
The Study
Researchers at the Johns Hopkins Bloomberg School of Public Health gathered data from published clinical trials comparing GLP-1 receptor agonists against placebo or other treatments. Their analysis of sex differences included 19,906 patients across six trials.
The headline finding: women who took GLP-1 medications lost an average of 10.88% of their initial body weight, compared to 6.78% for men. That's a meaningful, statistically significant difference.
Good News Across the Board
While the sex difference was notable, the other findings were universally encouraging. The analysis found similar effectiveness regardless of:
| Factor | Finding |
|---|---|
| Age (under 65 vs. 65+) | Similar effectiveness |
| Race | Similar effectiveness |
| Ethnicity | Similar effectiveness |
| Starting BMI | Similar effectiveness |
| Starting HbA1c | Similar effectiveness |
| Sex | Women: 11%, Men: 7% |
This is particularly important because clinical trials have historically underrepresented certain racial and ethnic groups. The Johns Hopkins analysis helps confirm that the benefits seen in trials extend across diverse populations.
Why the Sex Difference?
The researchers did not identify a definitive explanation for why women responded more strongly. Several hypotheses are being explored: hormonal differences in how GLP-1 interacts with estrogen and progesterone signaling, differences in body composition (women typically have higher body fat percentage), and potential differences in GLP-1 receptor expression or sensitivity between sexes.
Importantly, 7% weight loss in men is still clinically significant — it's associated with meaningful improvements in blood pressure, blood sugar, and cardiovascular risk. The men's results aren't disappointing; the women's results are just notably strong.
GLP-1 medications work across ages, races, ethnicities, and starting weights. Women may see somewhat greater weight loss than men, but both sexes benefit meaningfully. If you've been wondering whether these drugs would work for "someone like you," this data strongly suggests the answer is yes.
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Sources
- Mehta H, et al. GLP-1 weight-loss drugs comparably effective across age, race, and starting weight. Johns Hopkins / JAMA Internal Medicine. March 2026. jhu.edu