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Weight affects birth control effectiveness?

July 24, 2009 12:00:00 AM PDT
A new study suggests that oral contraceptives may not work as well for obese women, as they do for women of normal weight.Researchers at the Oregon Health and Science University in Portland assigned 20 volunteers between ages 18 and 35 to take birth control for two cycles.

Half the women were obese and the other half were of normal weight.

For the obese women, it took about ten days for the hormones in the pill to start suppressing ovulation.

It took about five days for the normal weight women.

Researchers admit that findings of studies on body mass index and the effectiveness of thebirth control pill have been inconsistent.

They are now calling for more studies before any recommendation is made on contraceptive use.

The study is published on Contraception, online June 4, 2009.

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