The first principle of a healthy diet is to eat the right amount of food, neither more nor less, because from a nutritional point of view, there is a tolerable maximum intake, and the recommended intake, if too much food is eaten during the diet, it will cause the excess of many nutrients, which will increase the burden on the liver and kidneys. If the amount of food eaten is too little, it will cause a lack of nutrients, so the first principle of a healthy diet is the right amount. The second principle of a healthy diet is that the ratio between various foods should also be appropriate, if the ratio between cereals, legumes, vegetables, fruits, meat, eggs, such a variety of food does not have a suitable range, it will cause too much of a certain type of food overload, too little intake of other foods, in terms of nutrient metabolism will produce an imbalance, but also is not conducive to health, so the principle of a healthy diet to The number of appropriate, the second to the right ratio.