It is impossible to generalize how many calories are appropriate for breakfast, but generally 300-500 kcal is appropriate. That is, 20-30% of the calories of the whole day is appropriate.
Breakfast intake of calories should be based on the amount of exercise, body weight and other conditions, if engaged in physical labor or the need for strenuous exercise, the basis of the body weight is more, then the breakfast needs to be more caloric intake in order to maintain the body’s energy balance; on the contrary, the breakfast does not need to consume too much calories, or easy to cause obesity, the general situation of breakfast intake of calories for 300-500 kcal.
In general, the breakfast choice of an egg (about 70 kcal), a cup of milk (300ML about 160 kcal), an apple (about 54 kcal), a piece of bread (about 130 kcal), you can intake of appropriate calories.
It is recommended that you need to eat breakfast regularly every day, and ensure that breakfast is rich and nutritionally balanced.