Final answer:
To prevent hypokalemia caused by loop diuretics, the patient should increase their intake of potassium-rich foods.
Step-by-step explanation:
Loop diuretics such as furosemide inhibit the reabsorption of sodium and chloride ions in the ascending limb of the loop of Henle, causing an increase in the excretion of these ions in the urine. This increase in urine output leads to a loss of fluids from the body, which can also result in a loss of potassium. To prevent hypokalemia, the patient should increase their intake of potassium-rich foods. By consuming foods that are high in potassium, the patient can help replenish the lost potassium and maintain normal potassium levels in the body.