Do GLP-1’s affect women at work? A new study may have an answer.
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How important are first impressions? A new study may help quantify that.
Since 2024, GLP-1 use has quadrupled, with usage currently at an all-time high in the United States. Today, over 11% of adults take GLP-1 medications for weight loss, with an estimated 15% reported using it at some point. And while the discussion around the results has largely been about healthcare and weight loss, new research suggests it may also be exposing something uncomfortable about the American workplace.
According to the recent findings from Harvard economist Rebecca Diamond in her June 2026 National Bureau of Economic Research working paper, GLP-1–Induced Weight Loss and the Female Obesity Penalty, women who were not employed when they began taking GLP-1 medications for weight loss experienced a significant change in their employment prospects after 18 months of usage. Those women saw their employment rate increase by nearly 27 percentage points compared with women who wanted to take GLP-1s but had not yet started. (It should be noted the study did not include men.)
As treatment continued and BMI declined, women’s likelihood of forming new economic and social relationships changed.
While good news for those in the study, for employers it raises a difficult question:
Why did suddenly losing weight make these women more employable?
LONDON, UNITED KINGDOM – OCTOBER 8: A photo illustration of a mounjaro injection pen and some weight scales on October 8, 2025 in London, United Kingdom. (Photo by Peter Dazeley/Getty Images)
Peter Dazeley‘Body Bias’ Is Affecting Careers
If GLP-1-induced weight loss made people healthier, happier, more productive, or more motivated, we might expect women already working to experience career improvements as well.
That isn’t what Diamond found. Women who were already employed when they started treatment did not experience any significant upward job mobility or evidence of them suddenly moving into better jobs as their weight declined.
Instead, the biggest employment gains appeared among women trying to enter new employment, new opportunities, and new working relationships. This suggests the advantage may occur at the door, as a first impression bias.
When considering a traditional hiring process, a recruiter reviews a candidate, a hiring manager meets them, and perhaps there is an executive interview over Zoom. Within minutes, people begin forming opinions about professionalism, confidence, and whether someone “looks like” they belong in a particular role.
While those judgments are supposed to be about the candidate’s qualifications, Diamond’s findings show that body size is influencing them too.
In addition to the employment findings, women who were single when they started GLP-1 treatment had an increased probability of becoming married or living with a partner, by as much as 28.6 percentage points. Yet, women already in relationships didn’t suddenly become more likely to stay together.
The pattern was remarkably similar to employment.
Diamond argues that this pattern is consistent with part of the “female obesity penalty” operating through what amounts to a first-impression discount.
Once coworkers know someone’s intelligence, work ethic, and capabilities, body weight becomes one characteristic among enormous amounts of other information.
But a stranger, in this case a new employer or new personal relationship, doesn’t have that information. They only know what they see and may be judging weight disproportionately.
Employers Should Be Aware
There is an important danger in interpreting these findings.
The conclusion should not be that women should take GLP-1s to improve their careers.
Instead, employers should look at the research as another reason to examine appearance bias.
Organizations have spent years discussing biases involving race, gender, age, and disability, while weight bias receives considerably less attention. Yet subjective corporate language masks reality. Phrases such as ‘executive presence’, ‘polished’, ‘client ready’, ‘culture fit’ and ‘looks the part’ are used as a way to speak around it. And without clearly defined criteria, these terms can also become proxies through which unconscious preferences enter hiring decisions.
The interview process may uncover ‘body bias’ in the workplace.
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In 2023, Harvard examined the pretty privilege bias when it comes to facial features and how that affects people’s opportunities. Although it’s argued that while pretty privilege does give you an unfair advantage at work, it only gets you so far.
The GLP-1 Era Could Expose Workplace Bias
One of the unexpected consequences of widespread GLP-1 adoption is that researchers gain a new way of understanding how society treats people differently based upon appearance.
The same woman can possess essentially the same education, experience, intelligence, and professional capability before and after significant weight loss.
What changes? Her body. And potentially the world’s response to it.
That may be the most important finding in Diamond’s research.
For leaders, that means examining structured interviews, establishing measurable hiring criteria, and questioning vague concepts such as “executive presence” when they cannot be connected directly to job performance.
The most troubling interpretation of this study isn’t that losing weight helped women find jobs; it’s that some of these women may have been qualified for those jobs all along. The workplace just may not have seen them that way based on how they viewed their bodies.