I have a fatty liver but I am not over weight no diabetes or high chlosterol my dr. Is very puzzled, would like to know what to expect over time?

See below. Alcohol can cause it and make sure triglycerides, not just cholesterol, checked and normal as well if no diabetes, alcohol, cholesterol, triglyceride problem, should be evaluated by liver specialist to rule out treatable rare causes as fatty liver can damage liver function over time!
Further exam . Have u been referred to a GI specialist for further exam? This maybe helpful. Other things to consider, hepatitis, meds, alcohol abuse, autoimmune diseases.