Milk is rich in protein and calcium, while chocolate contains oxalic acid, which together will form insoluble calcium oxalate. This greatly affects the body's absorption of calcium, and in severe cases, there will be dry hair, diarrhea and slow growth. So don't drink chocolate milk next time!

2. Fruit juice

Nutrition experts point out that if excessive fruit juice is added to milk, casein in milk will react with fruit juice, which will cause agglutination and precipitation, making it difficult for human body to digest and absorb. More seriously, it will cause indigestion and diarrhea, so milk should not be added with excessive acidic drinks such as fruit juice. Therefore, don't mix fruit juice casually in pursuit of fresh taste.

3. Fruit

Is it customary to have a fruit after drinking milk? In fact, this is not right. After drinking milk, you can't eat acidic fruit immediately, because protein in milk is easy to coagulate with fruit acid, which affects the absorption and digestion of milk. Therefore, if you want to eat acidic fruit, you'd better wait until an hour later.

4. Sugar

Adding a spoonful of sugar to warm milk makes the milk sweeter, which nutrition experts say is also wrong. When milk is heated and sugar is added, lysine in milk will react with fructose to produce toxic fructosyl lysine, which is harmful to human health. If you really think that the milk is not sweet enough, you can wait until the milk is cold and then add a piece of sugar.