Iron-Absorption Issues
Green tea can reduce the bioavailability of nonheme iron, which means your body is less able to absorb this nutrient. Nonheme iron is the primary type of iron in eggs, dairy and plant foods such as beans, so drinking green tea with these foods may lead to reduced iron absorption. Vitamin C increases nonheme iron absorption, however, so you can lessen the effect by squeezing lemon into your tea or consuming other vitamin-C rich foods, such as broccoli, with your meal. In addition, drinking tea between meals seems to have little effect on iron absorption, according to the National Cancer Institute.