Drinking tea on an empty stomach after getting up is a bad habit. Without food in the stomach, tea goes straight into the lungs, just like "inviting wolves into the room." As the saying goes, "Don't drink tea on an empty stomach" means this. The ancients said that "drinking tea on an empty stomach makes people feel flustered", especially when drinking strong tea on an empty stomach. Because of the high caffeine content in tea, the heart rate will be accelerated, which is another reason for "not drinking tea on an empty stomach". In addition, because of the "fasting" effect of caffeine in tea, drinking tea on an empty stomach will aggravate hunger, and in severe cases, it will cause hypoglycemia shock, which is not good for the body.