Breakfast should provide you with the main nutrients you need for studying or working all day. As long as you get up early in the morning, you can prepare a rich breakfast and eat it calmly. At noon, due to time or economic reasons, it is difficult for many people to have a nutritious and comfortable lunch. At night, because it is close to bedtime, eating too much is easy to get fat.
Therefore, I suggest that you don't just eat cookies with no nutrition but sugar for breakfast. Protein powder, in fact, is mainly used to lose weight, and its price is high, which is not conducive to normal people's diet.