A new study from Michigan State University suggests that combined oral contraceptives may be associated with stronger emotional eating in some women, especially those already vulnerable to binge-eating patterns.
What the researchers observed
The study followed 422 women aged 15 to 30 from the Michigan State University Twin Registry. All participants were using monophasic combined oral contraceptives, which deliver a steady dose of synthetic estrogen and progestin.
Over 49 days, the women completed daily evening surveys, along with weekly check-ins and two study visits. Researchers compared symptoms during active hormone pills with those during inactive pills, creating a built-in contrast within the same cycle.
The clearest pattern was in emotional eating--eating in response to stress or negative feelings. Participants reported higher emotional eating on active-pill days than on hormone-free days. The effect also appeared across two pill cycles and among women with current or past clinically significant binge-eating histories.
Why it matters
The findings do not show that birth control pills cause binge eating in every user. Instead, they point to a possible link between hormone exposure and appetite-related behavior in a subset of women. The researchers also found no similar shift in weight preoccupation, suggesting the effect was more closely tied to overeating than to body-image concerns.
Kelly Klump, the study's lead author and an MSU Research Foundation distinguished professor of psychology, said the results highlight a potential risk for some women while also noting that many users do not experience this pattern. The team controlled for mood, and the active-pill effect remained, indicating that negative emotions alone did not explain the change.
A practical takeaway
One encouraging result stood out: emotional eating declined over time, even during active-pill days. The researchers believe that daily self-monitoring may have helped participants notice and manage their habits more effectively.
The study was published in JAMA Network Open. The authors note that future research should include more diverse groups and other contraceptive types. If confirmed, these insights could help clinicians personalize contraceptive care and support healthier long-term choices for women.
