2. Lettuce leaves are rich in vitamins and minerals, including carotene, vitamin B 1, b2, vitamin C and calcium, which can be eaten by human beings.
3. Promote the diversification of food in healthy eating habits, especially eating some coarse grains and miscellaneous grains to ensure that the human body takes enough vitamins. In addition, in the diet structure, we should give priority to vegetables and fruits, and also eat staple food and coarse grains, and at the same time appropriately reduce the amount of meat and eggs, especially foods with more animal fat and fat analogy.