Some people with liver disease must eat a special diet. This diet helps the liver function and protects it from working too hard. Proteins normally help the body repair tissue. They also prevent fatty buildup and damage to the liver cells.
Advise is a verb, and advice is a noun. So advice is what is given, while the act of giving advice is called advising (or to advise).
Sage-the advice Sage advice is that which comes from a person of greater experience of the world, Sage in this case can be interpreted as wise. A wise person, some times a shaman or priest.