Drinking too much tea may affect sleep and digestion, in addition may affect the absorption of calcium in the body. Tea generally contains caffeine and theophylline, stimulating, if you drink too much or drink strong tea may lead to excitement, thus affecting sleep, neurasthenia patients are best to avoid drinking. Drinking too much tea will dilute the gastric juice, weakening the stomach’s digestive ability. Tea contains oxalic acid, ellagic acid and other substances, and the body and calcium ions combined, will not be absorbed by the body. So try to avoid drinking too much tea, also try to drink less strong tea, usually can drink less light tea, but also try to avoid after meals, fasting and bedtime tea.