fatty liver is one of he reasons someone might do this type of surgery, so i'm sure it wont stop you.
I have autoimmune liver disease so i'm followed closely by a specialist. He told me that after surgery i will have to be followed closely after surgery because in some patients, fatty liver does develop (of increase) in teh period after surgery. I guess the fat is being metabolised in the liver instead of sugars so it may take a while to adjust to it. a careful watch of LFT on your blood results is the fix.