Mild dieting may alter birth control hormone levels, study suggests
NCT ID NCT07651800
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times
Summary
This study looks at how a modest daily calorie deficit of about 250 calories affects reproductive hormones like estrogen and progesterone in women using different types of birth control (oral pills, hormonal IUD, or non-hormonal IUD). Researchers will track 30 recreationally active women aged 18-35 over two menstrual cycles—one normal and one with the calorie deficit. The goal is to see if mild energy restriction changes hormone exposure, which could have implications for contraceptive effectiveness and overall health.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- What this could lead to
- If successful, this study could help understand how mild calorie restriction interacts with hormonal contraceptives, potentially informing future guidelines for active women.
- What could go wrong
- This is a small, early-stage observational study with only 30 participants, so results may not apply broadly. It does not test a treatment or intervention.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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University of Southern California Health Sciences Campus Center for Health Professions
Los Angeles, California, 90033, United States
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