Yeah, fructose and ethanol are the main causes of fatty liver disease. After my earlier post, I came across an article about FLD, and it says that some of the triglycerides created by de novo lipogenesis can escape into the bloodstream, but mostly they clog up the liver, causing inflammation and eventually killing cells (i.e., the FLD becomes steatohepatitis).
Avoiding sucrose/fructose for as little time as a week can be of enormous help to your liver. Dr. Lustig describes a study he did on some kids with FLD, and after a week, the kids in the treatment arm had lost weight (on an isocaloric diet, no less!) and seen a noticeable improvement in the inflammation of their livers, whereas the children in the control arm maintained their weight and saw no improvement in their liver disease.
I can testify that, before even going full keto, just cutting out all sweets (never mind the grains, etc.) made me feel significantly better in only two or three days. I felt so good, in fact, that a few weeks later I did go full keto.