54yo wm history fatty liver. had cholecystectomy 5 months ago. better diet/excercise, have lost 80 lbs. can fatty liver be cured/go away?

Unfortunately , No: Once fatty degeneration stars liver cells and architecture of liver will never return (reverts) to complete normal state , how ever with proper diet , care ( by avoiding causative agents alcohol drugs , etc ) it is possible to hold the disease at this stage & some reversal , and delay further damage to liver cells that leads to cirrhosis.

Yes: There are many cases where fatty liver is reversible with improved diet and weight loss. Ask your doctor about your situation. Best!