Eating is a process of orderly intake of nutrition and energy by animals in order to maintain their physical strength and life, and it is an instinct of animals. All animals must eat other creatures to survive. The poem in "Nineteen Ancient Poems": "Thinking about the monarch makes people old, and the years are getting late. Don't give up donations and try to add meals. " A Dream of Red Mansions sentence: "Where you rest, you need to eat"; Feuerbach said: "If you have feelings in your heart, you must have something in your stomach first."
Eating is caused by hunger. Hunger stimulates appetite through some physiological and psychological effects, prompting animals to find food to eat. If eating disorders can lead to many diseases, such as anorexia, bulimia, malnutrition and so on. Different animals eat differently. For humans, eating refers to a series of processes of putting food in the mouth, then chewing and swallowing. Vegetarians such as cows and horses eat plants, carnivores such as lions and tigers eat other animals, and omnivores including humans and pigs eat both.
In human behavior, eating is an important part of family life and an important social behavior of human beings. Human food preparation and food consumption play an important role in human society. In China, "Food is the most important thing for the people" is the best summary of this truth.
Generally, if you don't eat for seven days, you will die if you don't drink water for three days. If you don't eat or drink, you can't get a clear answer. It depends on one's physical condition. What can survive without eating or drinking is the decomposition of substances in the body, first of all, blood sugar in the blood, then glycogen, and finally substances such as fat and protein. The decomposition of some substances will provide water and energy for the human body, but if it goes on for a long time, it will also be exhausted.
The reason why it depends on people's physical condition is because fat people will live longer. Last year, a cow reported that she only lived for more than 40 days without eating or drinking.