The proportions of the three nutrients in a balanced diet are as follows: carbohydrates should account for 55% ~ 60% of the total energy, fats should account for 25% ~ 30% of the total energy, and protein should account for10% ~15% of the total energy.

A balanced diet, in nutrition, refers to a diet that reaches recommended dietary allowance in an all-round way. This kind of diet means: first, the heat energy and nutrients obtained by the eater can meet the physiological requirements. Second, it is required to have an appropriate proportion of nutrients to achieve a physiological balance. Obtaining a balanced diet is the basic principle of formulating the dietary recommended dietary allowance standard, and it is also the ultimate goal of studying human nutrition to improve the health level of the whole people.