Birth Control Effectiveness Linked to Weight

Several studies have called into question the effectiveness of birth control in obese and overweight women.  A recent review article concludes that some birth control methods, such as the pill, might be less effective in obese women.

Scientists know little about how extra fat might lead to changes in metabolism and affect the way contraceptives are handled by your body. Researchers have called for more studies of birth control in obese and overweight women so health care providers can best advise their patients.

According to Live Science:

“In total, the seven studies [reviewed] included 39,531 women. Four of the studies suggested that the heaviest women have the highest risk of pregnancy while using the contraceptives ... Many researchers think that metabolic changes associated with obesity -- in particular, the amount of body fat -- could make hormonal birth control less effective.”

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