Green tea is one of the most popular healthy beverages worldwide, known for its powerful antioxidants that may support heart health, brain function, and overall wellness. However, nutrition experts warn that consuming green tea with certain foods or dietary supplements may interfere with the absorption of key nutrients in the body, particularly iron.
Green Tea and Iron Absorption
Green tea contains plant compounds such as polyphenols and tannins. These compounds can bind to iron in food or supplements, making it harder for the body to absorb it in the digestive system. Some studies suggest that drinking green tea with iron supplements may reduce iron absorption by as much as 90%.
For this reason, experts recommend waiting one to two hours after taking iron supplements before drinking green tea to allow the body enough time to absorb the mineral properly.
Effect on Folic Acid
Green tea also contains catechins, compounds that may interfere with the absorption of folic acid (vitamin B9). This vitamin plays an essential role in cell growth and the development of the nervous system, especially during pregnancy. Therefore, pregnant women are advised to consult their doctor before consuming large amounts of green tea.
Caffeine and Potential Side Effects
A cup of green tea typically contains between 30 and 50 milligrams of caffeine. When consumed alongside other caffeine sources such as coffee, energy drinks, or caffeine supplements, it may lead to symptoms like rapid heart rate, high blood pressure, insomnia, headaches, or anxiety.
Tips for Healthy Consumption
Experts recommend drinking green tea in moderation and avoiding it immediately after iron-rich meals or when taking supplements, in order to maintain proper nutrient absorption.
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