Final answer:
The nurse should encourage the patient to implement a high-roughage diet to relieve symptoms of frequent watery stools following chemotherapy treatment.
Step-by-step explanation:
The nurse will encourage the patient to implement a high-roughage diet to help relieve the symptoms of frequent watery stools following chemotherapy treatment. High-roughage foods, such as fruits, vegetables, and whole grains, are rich in dietary fiber. Dietary fiber can help add bulk to the stool and regulate bowel movements, reducing the frequency of watery stools. Examples of high-roughage foods include cabbage, bell peppers, grapes, and whole wheat bread.