Hello, it is ok to drink milk with sugar, but it is best not to add it at high temperature, because sugar will react with lysine in milk at high temperature to generate a new substance-fructosyl amino acid, which is not absorbed by human body, but harmful to human health.

Guiding opinions:

The correct way is to add sugar after the milk is cold, or add sugar after the milk is boiled and cooled to room temperature. In addition, don't add too much sugar, and the proportion of 5%-8% is more appropriate. White sugar will do.

Do not drink milk on an empty stomach. Drinking milk on an empty stomach is wasteful and useless. Drinking milk is the best food.