In my opinion this is a serious issue. Suggestions from knowledgeable persons, especially by doctors, will be help us to know the cause and prognosis of the disease and modern ways of treatment.
Fatty liver (hepatic steatosis) refers to build of fat in the liver. Obesity, hyperlipidemia, diabetes etc. are causes of this disorder. Fatty liver is definitely lethal, because it can lead to liver damage or may progress to liver fibrosis or to cirrhosis.
Please have a look a these links and PDF attachments regarding treatment of fatty liver disease.
There are many reasons that may/might cause accumulation of fat in liver,
from virus to alcohol.
The good news is that Liver is the only organ of our body which can regenerate completely.
The bad news is that it will take 3-4 years.
The best way to reverse the fatty liver is to avoid the items which cause inflammation to liver. Which includes; deep fried food, alcohol, hydrogenated oils etc. and include bitter vegetables and vitamin B2 which are good for a healthy liver.
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One should not go for self medication. Consult a specialist, modern medicine has all tools and treatment for the betterment. Never go with someones suggestion for so called "natural care", "Baba medicines" etc.
It will cause the adverse effect and I have seen it in my family.