Osteoporosis is brought on by a deficiency in calcium and vitamin D consumption, a reduction in calcium and vitamin D absorption, and a decrease in the skin's ability to synthesize vitamin D.
The body cannot absorb enough calcium when there is a vitamin D shortage to meet its demands. In order to maintain normal serum calcium levels, parathyroid hormone synthesis rises and calcium is mobilized from bones and reabsorbed in the kidneys, a condition known as secondary hyperparathyroidism.
The symptoms of muscle weakness brought on by vitamin D insufficiency are difficulty climbing stairs, feeling like your legs are heavy, and weakening of the proximal muscle groups.
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