The amount of alcohol consumed is primarily a genetic decision and is mainly related to the level of activity of two enzymes, acetaldehyde dehydrogenase and ethanol dehydrogenase, in the human body. After drinking, alcohol is absorbed into the bloodstream through the gastrointestinal tract and metabolized in the liver. First, it is converted to acetaldehyde under the action of ethanol dehydrogenase, and then converted to acetic acid under the action of acetaldehyde dehydrogenase, and finally excreted through the urine, so only the activity of the two enzymes are big alcohol can be big. If only the activity of ethanol dehydrogenase is strong, then the body will accumulate too much acetaldehyde after drinking alcohol. If it exceeds the body’s ability to compensate, symptoms such as flushing, nausea and vomiting will occur. If the activity of acetaldehyde dehydrogenase is strong, since acetaldehyde does not accumulate excessively, this group of people will experience symptoms such as pale face, nausea and vomiting. It is recommended to avoid drinking alcohol as much as possible so as not to affect your health.