My husband is in very early stages of stage 4 non alcoholic cirrhosis of the liver. his doctor told him to lose weight. what is his life expectancy?

Depends: Regarding his diagnosis, stage 1 is early and likely reversible with weight loss, excercise, and a good diet. Avoiding alcohol abuse and getting vaccinated against hepatitis b is also as good idea. It is not end-stage liver disease. Life expectancy could be totally normal.

Cirrhosis: So many variables here. Is he obese, diabetic, smoker, hypertensive, cardiac disease, immunocompromised, anemic, depressed, etc? If so, these provide a worse prognosis. Can't give a specific time.