Drinking beer only once will not affect the quality of sperm, but drinking a lot of alcohol over a long period of time will affect the quality of sperm.
Alcohol does have a certain effect on the quality of male sperm, but only drink beer once its impact on sperm quality is relatively small, if a large number of long-term drinking may affect the sperm vitality and viability, so that the sperm abnormality rate increased significantly, and with the increase in the amount of alcohol consumption, sperm vitality and viability and subsequently reduced.
Alcohol and its metabolite acetaldehyde can produce free radicals in the body to attack the unsaturated fatty acids on the membrane, and the testicular mitochondrial membrane as well as spermatozoa are rich in unsaturated fatty acids susceptible to attack, thus affecting sperm function. In addition to this alcohol can also act on the testes, hypothalamus pituitary axis to affect the spermatogenic function, so to avoid long-term heavy drinking.