"Alcohol is toxic." - my physical therapist sister.
Alcohol has considerable toxic effects on the digestive- and cardiovascular systems. Alcoholic beverages are classified as carcinogenic by the International Agency for Research on Cancer and increase the risk of several cancer types.
Is alcohol toxic to the human body?
An abundance of alcohol can harm the liver, whose job it is to break down harmful substances in the body. This can lead to hepatitis, jaundice and cirrhosis, which is the buildup of scar tissue that eventually destroys the organ. Alcohol may cause kidney, bladder and prostate inflammation.Jan 11, 2019
www.ncbi.nlm.nih.gov
Professor David Nutt: The idea that drinking small amounts of alcohol will do you no harm is a myth
www.theguardian.com
Besides all that, Guinness or beer, ale, etc. are relatively "empty calories," do I have to explain what that means?