Women who lost weight after starting GLP-1 medications were more likely to form new partnerships or enter employment, according to a July 13 working paper released by the National Bureau of Economic Research. The study, led by economist Rebecca Diamond, investigated the association between glucagon-like peptide-1 (GLP-1)-induced weight loss and women's socioeconomic experiences amid rapid adoption of these medications in the United States.
The analysis used data from a nationwide panel and found that GLP-1 initiation and associated weight reduction were followed by higher marriage or cohabitation rates among single women and increased employment entry among women not employed at baseline. These shifts occurred primarily through the formation of new partnerships and jobs rather than improvements within existing relationships or positions. The findings suggest that some economic and societal penalties faced by heavier women may arise when prospective partners or employers form initial impressions.
Previous research has shown that overweight and obese women experience disadvantages in labor and marriage markets, often referred to as the "female obesity penalty." While prior studies have established these penalties affect wages, job opportunities, and relationship formation rates, most have been correlational rather than causal. It remains unclear whether challenges are due to health impacts or external biases.
The current study focused on American women aged 25 to 61 years who reported initiating GLP-1 receptor agonists for weight loss. Using a matched difference-in-differences design with data from approximately 15,000 U.S. adults in the Understanding America Study panel, researchers compared outcomes such as partnership status changes, employment rates, weekly work hours, household income, job mobility, health status, and well-being over time.
Results showed an 18.3 percentage-point increase in probability of marriage or cohabitation among single women following GLP-1 initiation; this effect rose to 28.6 percentage points six quarters after treatment began. For those not employed at baseline, there was a 13.2 percentage-point increase in employment rate overall—rising further over time—and an increase of nearly ten weekly work hours during later periods post-initiation. Conversely, already-partnered or already-employed women did not see significant improvements within their existing relationships or jobs.
The author concluded that much of the female obesity penalty may operate as a "first-impression discount," with benefits observed mainly when new evaluators—such as hiring managers or romantic partners—form judgments about individuals following visible weight loss.
