Oriental Leaf is a kind of tea beverage, which is made with mountain spring water. Milk is a high-fat and high-protein thing. Drinking tea with milk will destroy the healthy ingredients in tea. Moreover, tannic acid in tea reacts with protein, the main ingredient of milk, to form a tannic acid protein substance, which has a strong contractive effect and makes the gastrointestinal peristalsis faster. If people with bad stomachs drink it, diarrhea will occur a few hours later.