A major consequence of long-standing vitamin D deficiency is increased intestinal calcium absorption leading to hypercalcemia, which, in turn, results in decreased secretion of PTH.

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A major consequence of long-standing vitamin D deficiency is decreased intestinal calcium absorption, leading to hypocalcemia, which, in turn, results in increased secretion of PTH (parathyroid hormone) to try to maintain calcium homeostasis.

A Major Consequence of Long-Standing Vitamin D Deficiency Is Increased