Birth Control Pills and Weight Gain
Filed under: Birth control, Weight Control on Thursday, November 20th, 2008 by admin |Do most women gain weight when starting on oral contraceptives and if so how much?
For the most part, older studies using higher dose pills tend to show an average of about 5 lb weight gain using pills. One study looked at adolescents who were using DeproProvera® (DMPA) for contraception and compared them to other teens using birth control pills. They found that after one year of contraception, the average weight gain was 6.6 lbs (3.0 kg) in the adolescents using shots (DMPA) and 5.3 lbs (2.4 kg) when using oral contraceptives. More importantly, only 7% of pill users gained more than 10% of their body weight while 25% of the DepoProvera® users gained more than 10%. If you just look at the average weight gain of 6.6 lbs vs 5.3 lbs, you would conclude that DMPA had only a slightly higher weight gain than pills. The fact that these averages include 18% more woman who gained greater than 10% of body weight can be hidden by average weight changes.
Thus DepoProvera® has a greater side effect of weight gain than oral contraceptives.
In another study with a fairly high dose pill (50 mcgm) from 20 years ago, investigators found an 11.4% weight increase of over 4.4 lbs (2.0 kg) but also a 14.3% incidence of over a 4.4 lbs weight loss on the same pill. In other words there was just as much weight loss as weight gain. This finding could be interpreted as the pills cause no overall weight change in woman on the average, but an alternative explanation is that some women get nauseated from pills and have a net weight loss while the others who did not get nauseated gained a substantial amount of weight.
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