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).
What is ADVICE? View; opinion; the counsel given by lawyers to their clients; an opinion expressed as to wisdom of future conduct The instruction usually given by one merchant or banker to another by letter, informing him of shipments made to him, or of bills or drafts drawn on him, with particulars of date, or sight, the sum, and the payee.