Despite the health benefits of green tea (scientists think it may protect against cancer), it's best to skip it if you're trying to conceive. It decreases the effectiveness of folic acid, which is vital for preventing neural tube defects in the first month after conception. The effect is small if you continue to eat folate-rich greens and take a folic-acid supplement, but why take a chance? After the first trimester, up to a cup a day is fine.

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