by 
The Curious Bag
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<h4 class="dechead">On One Hand: At Least Three Cups
Most research about the benefits of drinking green tea is based on the three cups that people in some Asian countries typically consume daily. Three cups provide 240 to 320 mg of polyphenols, which act as antioxidants and protect the body from free radicals. According to the European Journal of Clinical Nutrition and Japanese studies, the effects of green tea increase when multiple cups are consumed daily--the more tea consumed, the greater the benefits.
On the Other: Pregnant Women Should Avoid Green Tea
Green tea has not proved to be harmful to pregnant women, but it has been shown to decrease the effectiveness of folic acid, which is a vital pregnancy vitamin. The authors of "What To Expect When You're Expecting" recommend either staying away from green tea entirely, or drinking it in moderation.
Bottom Line
Green tea has benefits that can help protect against diseases in most people. Drinking more or less than three cups has not been shown to be harmful. Women who become pregnant should take a break from green tea until after they give birth, just to be on the safe side.
Source:
The World's Healthiest Foods: Green Tea
"What to Expecting When You're Expecting;" Heidi Murkoff and Sharon Mazel; 2008
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