Caffeine May Alter Women's Estrogen Levels
Caffeine changes women's estrogen levels and has different effects in Asian and white women, a new study says.
More than 250 women, ages 18 to 44, took part in the study between 2005 and 2007. On average, they consumed 90 milligrams of caffeine a day, about the equivalent of one cup of caffeinated coffee.
Estrogen is the reproductive hormone produced by the ovaries.
Asian women who consumed an average of 200 milligrams or more of caffeine a day (equivalent to about two cups of coffee) had elevated estrogen levels compared to women who consumed less. But white women who consumed the same amount of caffeine had slightly lower estrogen levels than women who consumed less.
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