Final answer:
The nurse should advise the client to adopt a healthy diet that is high in fiber and low in fat, and to avoid residue, lactose, fat, and caffeine. Drinking plenty of water and getting regular exercise can also help in managing diarrhea.
Step-by-step explanation:
The nurse should advise the client to adopt a healthy diet and avoid certain substances that can worsen diarrhea. This includes reducing the consumption of residue, lactose, fat, and caffeine. Instead, the client should focus on eating a balanced diet that is high in fiber and low in fat. Drinking plenty of water and getting regular exercise can also help in managing diarrhea.