Adults eat about three small bowls a day. Generally speaking, adults need to eat three to five staple foods every day. As a staple food, rice is the main energy source, and three meals a day cannot be short of staple food. People whose staple food is white rice should pay attention to cooking methods and cook reasonably to avoid nutrient loss.

In a reasonable diet, 60% to 70% of a person's total calories a day come from carbohydrates. Rice is easier to digest than fish and meat. Rice also has the irreplaceable importance of other nutrients. According to the physical condition of China people, an adult should eat at least six taels of rice every day. Otherwise, eating vegetables with high protein, high fat and low fiber for a long time is prone to hypertension, cardiovascular disease and obesity.

The main component of rice is carbohydrate, which is the necessary energy to maintain brain function. Rice is one of the main sources of carbohydrates in human body. If a person eats too little rice every day, his body can't supplement too many carbohydrates, and his physical strength can't be supplemented. The Nutrition Society of China recommends that everyone eat 250 to 400 grams of cereal every day, depending on everyone's calorie consumption.

People who eat three meals a day eat not only to fill their stomachs or relieve hunger, but also to ensure all normal growth and development of the human body and physical and mental health. Experiments have confirmed that the digestibility of protein in three meals a day is 85%; If it is changed to two meals a day, each meal is half of the 24-hour food, and the digestibility of protein is only 75%. Therefore, according to the lifestyle of China people, generally speaking, three meals a day is more effective.