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).
Definition of advise for English Language Learners. : 1  to give an opinion or suggestion to someone about what should be done : to give advice to (someone) : 2  to recommend or suggest (something) : 3  to give information to (someone)