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Food (English: food) refers to substances that can meet the normal physiological and biochemical energy needs of the body and prolong normal life. For the human body, substances that can meet the needs of normal life activities and help to prolong life are called food.

Food is usually composed of carbohydrate, fat, protein and water, which can provide nutrition or pleasure for human beings or organisms by eating or drinking.

The source of food can be plants, animals or other organisms, such as fungi, or fermented products, such as alcohol. Humans obtain food through gathering, farming, animal husbandry, hunting, fishing and hunting and other different ways.

Generally speaking, it can be seen from the color, taste, growing environment, geographical location and growing season of food. From the color point of view, green plants are close to the ground and absorb the water on the ground, so they are cold, such as mung beans and vegetables.

Plants with reddish colors, such as pepper, pepper, jujube and pomegranate, grow close to the ground, but their fruits are hot because they are exposed to the sun for a long time.

From the taste point of view, sweet and spicy foods, such as garlic, persimmon, pomegranate, etc., are hotter because they receive more sunlight. And those foods that taste bitter and sour are mostly cold, such as bitter gourd, bitter vegetable, taro, plum, papaya and so on.

From the growth environment, aquatic plants are cold, such as lotus root, kelp, seaweed and so on. And some foods that grow on land, such as peanuts, potatoes, yam, ginger and so on. They are all hot because they are buried in the soil for a long time, and the plants are drought-resistant and have less water content.

From the geographical location of growth, foods with shadows facing north absorb heavy moisture and rarely see sunlight, so they are cold, such as mushrooms and fungus. Some foods that grow in the sky, or foods in the southeast, such as sunflowers and chestnuts, are hot because they receive enough light and heat.

Both food and oral medicine are taken orally, but they play different roles after being ingested by the human body. Food has nutritional function, can provide energy and nutrition, make people enjoy delicious food and keep healthy;

Drugs mainly play a therapeutic role, have no nutritional role, and often have side effects. Foods with the same origin of medicine and food, such as jujube, mung bean and coix seed, have both dietetic and nutritional functions.