Hi. I have stenosis of the hepatic arteries. That is different than the steatosis your son has. I had non alcoholic fatty liver due to genetics (about 5 % of folks who have fatty liver are non alcoholic ). I never had any symptoms of that nor do I have any from my stenosis which I got after a liver transplant. Both were found by scans & blood work. I got rid of the bad liver via transplant but gained the stenosis. Overall a good trade for me. But anyway the way your son retains fat in the liver is probably genetic the way my liver was fatty despite not drinking & other healthy habits ,etc. My mom and other family members are pretty heavy drinkers and their livers are fine. But I have been a very light drinker since college and needed a liver transplant. My liver took after my dad not my mom. Sounds like you are doing all the healthy things. Good ! Your doctor will have medications for it if warranted. Best of luck.