Green tea contains caffeine and tannins, an antioxidant that can mess with iron absorption. So drinking it at certain times ...

Drinking green tea with L-theanine can cause calm alertness because the caffeine in the tea wakes you up, while L-theanine promotes relaxation.

Lauren Manaker is an award-winning registered dietitian, book author, speaker, and entrepreneur. She has been practicing dietetics since 2004, and has worked in a wide variety of settings. She earned ...