It's like not eating fried dough sticks without drinking soybean milk. Fried dough sticks contain alum, which can only be eaten with soybean milk to ensure that it is harmless to the body.
The same is true of milk, which has the function of harmonizing stomach and strengthening stomach, especially for stomachache.
However, drinking milk on an empty stomach is not conducive to gastrointestinal absorption and is easy to cause diarrhea. Therefore, when drinking milk, you should eat some bread and other foods.