Taking food, also known as taking the bait, refers to taking drugs to keep healthy. Taoism believes that there are some drugs in the world and in the non-world that people can take to get rid of diseases and prolong life, and even live forever. Ge Hong quoted the Four Classics of Shennong as saying: Taking medicine can prolong life, promote people to become gods, nourish nature with traditional Chinese medicine, and treat diseases with drugs. Driven by this belief, Taoism has gradually accumulated a set of prescriptions for collecting, making and taking longevity drugs in practice, which is called taking medicine.