Hyperparathyroidism is the most common cause of hypercalcemia (excessive levels of blood calcium) and the third most common endocrine disorder in the United States. When the parathyroid glands that secrete too much parathyroid hormone, the body starts to mobilize the calcium in the bones, which leads to increasingly poor bone density, and host of other secondary effects, like kidney stones, and increased risk of high blood pressure and stroke.
Results suggest that increased calcium may be independently associated with a reduced risk of primary hyperparathyroidism in women. Just remember to take your vitamin K if you're calcium supplements.
As an aside, I should mention another new study that I've decided not to dedicate an entire post to--this one showed that supplementation with 1000 IU/day of vitamin D supressed parathyroid hormone. So looks like the old one-two combo of calcium with vitamin D continues to show positive benefits despite a few unfavourable studies in the past few years.
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- Calcium intake and risk of primary hyperparathyroidism in women: prospective cohort study
- Supplementation with 1000 IU vitamin D/d leads to parathyroid hormone suppression, but not increased fractional calcium absorption, in 4–8-y-old children: a double-blind randomized controlled trial