Medicines and chemicals are broken down in the liver and when they are ceased/reduced, the liver gets to rest.
Earlier, cirrhosis developed in people who consumed a lot of alcohol, but now it is more common, even in those that do not consume excess alcohol. This could be due to medications and chemotherapy.
In some cases, cirrhosis of the liver might be too advanced to be reversed. In addition to eliminating the cause, a healthy vegan or WFPB diet is the best thing for the liver.