Medical research has concluded that drinking alcohol or various beverages containing alcohol (i.e., ethanol) has certain adverse effects on the human body. The term “drunkenness” is often used to refer to alcohol poisoning. The adverse effects of alcohol on the human body are manifold. The first and foremost is liver damage, because after the intake of alcohol, more than 90% is metabolized by the liver, a large amount of alcohol, its metabolites and the metabolic disorders of liver cells caused by it, is the main cause of alcoholic liver damage. According to research, normal people drink an average of 40 grams to 80 grams of alcohol per day, 10 years can appear alcoholic liver disease, such as an average of 160 grams per day, 8 to 10 years can occur cirrhosis of the liver. The second is the impact on the heart, a large number of people who drink alcohol will occur cardiomyopathy, which can cause the heart muscle tissue weakness and damage, and fibrous tissue proliferation, seriously affecting the function of the heart. The third is the damage to the brain and nervous system. The intake of more alcohol can cause serious damage to memory, attention, judgment, function and emotional response. Drinking too much alcohol can cause slurred speech, blurred vision, slower reactions and loss of balance. This is very harmful to drivers and is often a major cause of car accidents. The damage to the brain from long-term alcohol consumption may be irreversible. The results of a study in the United States showed that both light and moderate drinking can cause shrinkage of brain volume after alcohol consumption. In addition to this, alcohol has adverse effects on other aspects of human function. For example, excessive alcohol consumption can lead to acute gastritis attacks, and long-term alcohol consumption can lead to chronic gastritis, gastric ulcers, infertility, fetal malformations, and neuropsychological disorders. Studies have also shown that excessive alcohol consumption can increase the prevalence of oral cancer, throat cancer, esophageal cancer, breast cancer, and liver cancer. Although some data suggest that small amounts of alcohol (50 ml of wine per day) may reduce the risk of coronary heart disease in older men and women to some extent, even small amounts of alcohol may cause accidental injuries such as traffic accidents and increase the chance of developing more than 60 diseases. Thus, it seems that the evidence for the claim that small amounts of alcohol are beneficial to health is very limited and not worth the risk.