1, Nutrition: A biological process in which the human body ingests, digests, absorbs and utilizes nutrients in food to meet the physiological needs of the body.

2. Nutrients: refer to the chemical components in food that can provide energy, body composition, tissue repair and physiological regulation.

3. Nutrition: To study the physiological effects and beneficial effects of nutrients and other bioactive substances in food on human health.

4. Basal metabolism: refers to the minimum energy consumption to maintain life, that is, the energy consumption when the human body is awake after fasting 12 hours under quiet and constant temperature conditions.

5. Macronutrients: protein, fat and carbohydrates consumed in large quantities are all macronutrients.