How can we improve immunity safely, effectively and reasonably? It is safest to improve immunity and eat reasonably. Comparatively speaking, a reasonable diet is safer than other means in improving immunity. What is a "reasonable diet"? Many people still have misunderstandings. Such as that "high-grade, exquisite food must be nutritious", "eating more fish and meat must be scientific" and so on. In fact, a certain food or a certain kind of food has its own nutritional components and biological characteristics, and it is impossible to fully meet all the nutritional needs of the human body. Any monotonous diet pattern or bad partial eclipse habit will lead to partial overnutrition and partial undernutrition in the body, leading to nutritional imbalance in the body. One of the adverse consequences of this imbalance is the decline of immunity. Therefore, for many people, the premise of improving immunity is to establish the concept of "balanced diet" and use this concept to guide daily eating behavior. What is a "balanced diet"? Simply put, a balanced diet can be summarized as "comprehensive, balanced and moderate" six concepts, including six principles: ① proper deployment; 2 varieties; ③ The proportion of thermogenic nutrients (protein, fat and carbohydrate) is reasonable; ④ Coordination between non-thermogenic nutrients and thermogenic nutrients; ⑤ Coordination between inorganic salts; ⑥ Nutritional components are coordinated with each other. It is to make the proportion of various nutrients contained in food appropriate, so that a sufficient number of various foods are in a relatively balanced state and avoid the adverse consequences of overnutrition or undernutrition. The role of vitamins is very important: research shows that various vitamins, especially vitamin C, have a certain effect on improving and maintaining immunity. The main sources of vitamin C are fresh vegetables and fruits. Eating half a catty of green leafy vegetables and two or three fruits every day, especially sweet oranges, wild berries and kiwis, or drinking two glasses of fresh orange juice is good for vitamin C supplementation. In addition, don't ignore other important vitamins and their main sources: vitamin A: animal liver, egg yolk, cod liver oil, tomatoes, carrots, sweet potatoes and so on. Vitamin D: sufficient light, cod liver oil, egg yolk, milk, etc. Vitamin e: vegetable oil; Vitamin B 1: coarse grains, beans, peanuts, lean meat, viscera, dry yeast, etc. Vitamin B2: egg yolk, river crab, eel, Tricholoma, laver, etc. Folic acid: animal liver, fruits, vegetables, wheat bran, etc. Vitamin B 12: meat, milk and animal viscera. Theoretically speaking, if our diet can achieve a balanced nutrition, then all kinds of vitamins needed every day will not be lacking. However, the actual situation is often not so ideal: the loss of food during storage, processing and cooking and people's different degrees of partial eclipse lead to unbalanced vitamin intake. Therefore, on the basis of a balanced diet, it is necessary to scientifically supplement multivitamin preparations to improve immunity.