A woman’s genetic make-up may cause her to gain weight when using a popular form of birth control, according to a study from researchers at the University of Colorado Anschutz Medical Campus.

“For years, women have said that birth control causes them to gain weight but many doctors failed to take them seriously,” said the study’s lead author Aaron Lazorwitz, MD, assistant professor of Obstetrics/Gynecology and Family Planning at the University of Colorado School of Medicine. “Now we have looked at the genetics and found that the way genes interact with some hormones in birth control could help explain why some women gain more weight than others.”

The study, published online today in the journal Contraception, specifically looked at the etonogestrel contraceptive implant. The rod-like implant, considered one of the most effective birth control methods, is inserted under the skin and contains etonogestrel a kind of progestin that inhibits ovulation.



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