From a control stand point, as Bill1954 points out, it's important to stay away from red meat -- vegetable proteins and
fish are the best sources of protein to help control ammonia
. My husband has replaced much of his red-meat consumption with peanut butter, sardines, beans, and such. He personally abhors tofu, so for him, it's lots of nuts (almonds, cashews, etc.) and occasional cheese or eggs or ice cream as a treat.