(1) The food pyramid divides food into six groups, showing the daily demand for various nutrients. The bottom of the food pyramid is the widest layer, which shows that the food in this layer is the main part of the dietary structure, and the amount decreases from bottom to top. This difference shows that people have different needs for different nutrients.

(2) The cereals at the bottom of the food pyramid, such as rice, oats and noodles, are in greatest demand.

(3) The amount of exercise, one's physique and growth period will all affect one's nutritional intake. If you exercise a lot and are in the growth stage, then each group should eat more.