The three principles of scientific nutrition are: first, nutrition should be balanced; Second, nutrition should be comprehensive; Third, the nutrition should be fresh.

Nutritional balance: refers to the consumption of nutrients according to one's own activities, that is, consumption = intake.

Nutrition should be comprehensive: it means that food should be matched so that the body can absorb the needed nutrition from various foods.

Nutrition should be fresh: it means that any food is fresh, with more nutrients than the old one, and fresh food has high vitamin content.

In a word, scientific nutrition should follow three principles: food is the most reasonable to eat with, the farther the property of food is, the better to eat with meat and vegetables; The more kinds you eat, the better, and it is best to eat several together; Eat as close as possible. You can't eat for more than two hours. Why do you say that the closer you eat several foods, the better, because the nutrients needed by the body have synergistic effects, and no one has been in contact with anyone for more than two hours.