generally, the amount of breakfast staple food should be between 15g and 2g, and the calorie should be about 7kcal.

Of course, people with different labor intensity and different ages need different calories. For example, primary school students need about 5 kilocalories, while middle school students need about 6 kilocalories.

in terms of the amount of food and calories needed for breakfast, 3% of the total food and calories per day is appropriate for people of different ages.