Alcohol in the body is mainly broken down and metabolized by the enzymes ethanol dehydrogenase and acetaldehyde dehydrogenase, with those who are red after drinking due to a deficiency of the enzyme acetaldehyde dehydrogenase and those who are white lacking both. When alcohol (ethanol) is absorbed into the body, acetaldehyde is formed by the action of the enzyme ethanol dehydrogenase produced by the liver. Acetaldehyde causes capillaries to dilate rapidly, and as more and more acetaldehyde accumulates in the blood vessels, the drinker’s face can be found to turn red. Under normal circumstances, acetaldehyde will continue to be broken down into acetic acid by the action of acetaldehyde dehydrogenase, and the redness of the face will be relieved. However, when the drinker’s acetaldehyde dehydrogenase is deficient, the metabolism of acetaldehyde into acetic acid requires hepatic P450 oxidase, and due to the low specificity of this enzyme, the conversion time is longer, and therefore the drinker’s face is red for a longer period of time. Drinking white people is due to the lack of ethanol dehydrogenase and acetaldehyde dehydrogenase, there is no rapid generation of acetaldehyde, the face of the capillaries will not dilate, naturally, will not blush. And this kind of people in the body of alcohol mainly rely on the liver P450 oxidase to metabolize, is also a manifestation of the slow metabolism of alcohol in the human body. Acetaldehyde and ethanol are recognized by the authorities as carcinogens, regardless of the red or white face after drinking, drinking is a behavior that hurts the body. It is recommended that you try not to drink, drink less or drink in moderation, and develop good habits.