Final answer:
The three stages of liver injury due to excessive alcohol consumption are alcoholic fatty liver, alcoholic hepatitis, and cirrhosis.
Step-by-step explanation:
The three stages of liver injury due to excessive alcohol consumption are: alcoholic fatty liver, alcoholic hepatitis, and cirrhosis.
Alcoholic fatty liver is the first stage, characterized by the accumulation of fat in the liver cells. This condition is reversible with abstinence from alcohol.
Alcoholic hepatitis is the second stage, marked by inflammation and damage to the liver cells. If alcohol consumption continues, it can progress to cirrhosis, which is the third stage characterized by the formation of fibrous tissue in the liver, replacing the dead liver cells.