Caffeine Alters Estrogen

Most of us have heard that caffeine can affect fertility and can contribute to miscarriage. This article, however, talks about how caffeine can alter estrogen. Sometimes it increases and sometimes it decreases. Although they did not find an alteration in women's menstrual cycles, it seems that there must be some reproductive ramifications if hormones are being altered. Read more:

medicalnewstoday.com

From the article:

The researchers gathered data on over 250 women aged 18 to 44 years from 2005 through 2007. They drank an average of 90 milligrams of caffeine per day - a little more than the equivalent of a cup of coffee's worth.

The participants came into the clinic from once to three times a week during two of their menstrual cycles. The researchers gathered data on what they had eaten during the previous 24 hours, as well as details on their sleeping hours, smoking, exercise and other lifestyle patterns. Their estrogen levels were also measured.

In an Abstract in the journal, the authors concluded:

"Moderate consumption of caffeine was associated with reduced estradiol concentrations among white women, whereas caffeinated soda and green tea intakes were associated with increased estradiol concentrations among all races. Further research is warranted on the association between caffeine and caffeinated beverages and reproductive hormones and whether these relations differ by race."