As the doctor has already mentioned the commonest causes of fatty
liver are over weight and obesity as well as alcohol consumption. If you consume less than 29 g of alcohol a day this is likely to be NAFLD non alcoholic fatty liver disease.
Next Steps
You need to visit a general physician or gastroenterologist, you can do a complete evaluation.
Health Tips
Due to insufficient space in the Q&A section, and as fatty
liver disease is one of the most common problems on this forum, I have written a brief article on this. "All You Need to Know About Fatty Liver Disease" by Dr.Nimisha S Kantharia - https://www.practo.com/healthfeed/all-you-need-to-know-about-fatty-liver-disease-33286/post
I hope you find it helpful.