The goal of a healthy diet is to maintain a constant ideal weight, prevent diseases, and consume adequate and balanced nutrition. In order to achieve this goal, there should be as many kinds of food in the diet as possible. Eat rich cereals, vegetables, fruits and beans (plant foods are rich in dietary fiber and various nutrients, but low in fat and cholesterol), and eat a diet with low fat, cholesterol, salt, sodium and sugar (most dietary fiber, vitamins and minerals in processed foods have been destroyed after processing). On the contrary, it contains a lot of salt, fat and sugar.