Final answer:
The nurse should recommend low-potassium foods such as apples and carrots to the client receiving a potassium-retaining diuretic, while avoiding high-potassium foods like spinach and avocado.
Step-by-step explanation:
A nurse is providing dietary teaching to a client receiving a potassium-retaining diuretic, and the client needs to know which foods are low in potassium to balance their diet. The nurse should include foods like apples and carrots on the list, as these contain lower amounts of potassium. Spinach and avocado, on the other hand, are high in potassium and should be avoided by someone trying to limit their intake. People requiring a diet low in potassium should focus on consuming fruits like apples, berries, and peaches, and vegetables like carrots, cabbage, and green beans.