Therefore, drinking milk on an empty stomach will not cause waste in protein. As for protein in milk, it will agglomerate in the stomach because casein in milk has the characteristics of acid precipitation, and milk is condensed into small pieces by gastric acid, which is similar to the principle that milk is fermented into yogurt. No one will find yogurt difficult to digest. However, some people with gastrointestinal function or congenital lactose intolerance should not drink milk on an empty stomach. Drinking milk on an empty stomach will lead to bloating and diarrhea. Such a person is not suitable for drinking milk on an empty stomach. It is better to drink milk several times after eating some starchy food.
Times have changed, and the diet of residents has also changed greatly. Nowadays, many children and young people often drink milk and yogurt since childhood, which has a strong digestion ability for lactose in milk. Even if they drink milk on an empty stomach, they don't feel uncomfortable. Then, the so-called "you can't drink milk on an empty stomach" will be changed, at least on the premise that you can't generalize. Therefore, if you often drink milk from an early age and your gastrointestinal function is good, drinking milk on an empty stomach will not cause any discomfort or harm. I suggest you eat some bread or biscuits before drinking milk, so that milk will become chyme when it enters the stomach, which is helpful for absorption.