my wife has just been treated for this non-alcoholic liver condition when it advanced to cirrhosis(scarring) which is NOT reversible damage and sets the stage for failure if unaddressed. Luckily the condition of ammonia overload, especially in the brain is very treatable with the right laxative to help the poorly processed liver by-product out of the system. Only for some years has this been taken seriously enough in diabetics. So, for better or worse, the best thing to do is treat with diet, exercise.
IF you have fatty liver, THAT is the time to fight it immediately with every lifestyle change necessary. The ammonia creeping in can be very insidious and hurts the mental functions terribly and episodically, reinforcing behavior that leads to worse. For a year we thought it was diabetic fugue or some type of dementia. It did not even show up until the second hospitalization because they do not normally test for ammonia and the levels have to be fairly high to be good indicators.
So, yes fatty liver is reversible. Ammonia poisoning even if ingested is very rarely fatal. But liver damage, scarring, is not. Diet and exercise. Happy to recommend this without controversy. And your diabetic meds and statins are generally found to be helpful too, which seems good news.