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).
The verb to advise is spelled with the ending-ise. Advise has three meanings: 1  to tell someone what you think they should do in a particular situation: I advised her to go home and get some sleep; he advises caution when it comes to buying property abroad.