According to a study done by researchers at National Institute of Health, Asian women had higher levels of estrogen when subjected to 200 milligrams of caffeine when compared to white women who were subjected to the same amount. 200 milligrams of caffeine is equivalent to two cups of coffee. When the same tests were conducted on African-American women, they were found to possess more levels of estrogen than both Asian and white women.
This study which was released in American Journal of Clinical Nutrition, introduced caffeine in the women’s regime in the form of coffee, caffeinated soda and green tea and found that coffee made the most difference in the levels of estrogen. The women subjected to these tests didn’t notice any change in the menstruation patterns.
Although drinking moderate amounts of coffee doesn’t vary your estrogen levels much, drinking pronounced amounts could lead to major differences in the estrogen levels. Taking notice of the fact that higher levels of estrogen have been linked to as endometriosis, osteoporiosis, and endometrial, and ovarian cancers, it can be said that daily caffeine consumption should also be taken into consideration when studying about these disorders.
According to the study which concentrated on 250 women from 2005-2007, an average women consumed 90 milligrams of caffeine in a day which was considered moderate. The study also concluded that moderate intake of caffeine reduced estradiol concentration in white women whereas consumption of green tea and caffeinated sodas increased estradiol concentrations among all the races.