Food nutrition refers to the process of human digestion, absorption and utilization of food or nutrients, and it is also the process of human obtaining food from the outside world to meet their own physiological needs.
The broad definition of health is not only not to get sick, but also to keep the relative balance between the body and the environment physically, psychologically and socially. But in food nutrition and health, the definition of "health" mainly refers to the result that the human body maintains a relative physiological balance in the process of food nutrition.