Which dietary advice should be given to a patient with hyperparathyroidism to prevent complications?

Rationale: A. Vitamin K plays a role in blood clotting and bone metabolism, but it does not directly address the complications associated with hyperparathyroidism, such as hypercalcemia, kidney stones, or bone demineralization. While maintaining adequate vitamin K is generally beneficial for overall health, it is not a priority dietary modification in managing hyperparathyroidism. B. High sodium intake increases urinary calcium excretion, which can promote kidney stone formation. Since patients with hyperparathyroidism are already at higher risk for hypercalcemia and nephrolithiasis, recommending high-sodium beverages would worsen these risks rather than prevent complications. Sodium restriction is therefore a safer approach. C. Hyperparathyroidism leads to elevated parathyroid hormone (PTH) levels, which increase calcium in the blood and alter phosphate metabolism. Excess dietary phosphate can further disrupt the calcium-phosphate balance, contributing to vascular calcifications, bone loss, and kidney complications. By limiting foods high in phosphate—such as processed meats, sodas, and certain packaged foods—patients can help maintain a more stable calcium-phosphate balance, supporting bone health and reducing the risk of kidney stones and cardiovascular complications. This dietary modification is a key preventive strategy in managing hyperparathyroidism. D. Dairy products are high in calcium. Since hyperparathyroidism already causes elevated serum calcium, increasing dietary calcium can exacerbate hypercalcemia, increasing the risk of kidney stones, cardiovascular issues, and neurological symptoms. Calcium intake should generally be moderated rather than increased, unless a healthcare provider specifically prescribes supplementation for deficiency.