Liver and spleen function/problems

Hey guys,
I just had a physical and the doc found I had a slightly enlarged liver and that my spleen is at the upper limit of normal. Now, my doc is very old school, and he wants me to lay off any protein that isn’t from food, i.e. powders, bars etc. This is going to be hard because like most of you, I drink Grow! once or twice a day and have pre-ordered surge. Any of you have any input on why he would want me to lay off protein or if he has a logical reason for this?