2. Lunch refers to lunch. A nutritious lunch provides people with energy for the whole afternoon. A reasonable lunch needs staple food: rice or noodles (steamed bread is the staple food in the north), protein for meat and vitamins for vegetables. China thinks that lunch is the main meal in a day and the main supplement of food and energy. There is a saying that "breakfast should be eaten well, Chinese food should be full and dinner should be eaten less".