Aldehydes are bad, and this is known. They crosslink proteins spontaneously. Aggregating proteins is a major facet of aging. Alcohol is broken town to acetylal

Aldehydes are bad, and this is known. They crosslink proteins spontaneously. Aggregating proteins is a major facet of aging. Alcohol is broken town to acetylaldehyde, and this cross-links proteins in the liver and causes cirrhosis, and hopefully not... Liver cancer.