Lactose intolerance is a symptom caused by the lack of digestive enzymes that digest lactose in the body. It is mostly expressed in Asia. Because the body lacks lactase, it can't digest and decompose lactose. When it is used by the human body, lactose will become lactic acid under the decomposition of bacteria, and the human body will secrete a large amount of alkaline digestive juice to neutralize lactic acid, which is easy to cause mild diarrhea ...

In a word, Asians are prone to mild diarrhea because of lack of lactase, which is lactose intolerance.