Acetaldehyde dehydrogenase mainly converts acetaldehyde into acetic acid. After drinking alcohol, ethanol enters the bloodstream in large quantities and is metabolized by the liver, which converts ethanol into acetaldehyde, which is converted into acetic acid under the action of the enzyme acetaldehyde dehydrogenase, and acetic acid is finally converted into carbonic acid and water. Due to the lack of the enzyme acetaldehyde dehydrogenase in the liver, after the conversion of ethanol into acetaldehyde, acetaldehyde will accumulate in large quantities and cannot be effectively converted into acetic acid, resulting in a large amount of blood, causing redness, panic, chest tightness, sweating, and other drunkenness, which is due to the result of a large amount of acetaldehyde into the blood, and the relative lack of the enzyme acetaldehyde dehydrogenase. Therefore, it is generally not recommended to drink a lot of alcohol or as little as possible to avoid the symptoms of drunkenness.