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And to reinforce the original point: Vitamin D helps calcium and phosphorus uptake in your system (really, it's crucial for it): "For example, some of the proteins produced in response to calcitriol in the intestine help transport calcium across the intestine and into the bloodstream, greatly increasing the absorption of calcium from the diet. The vitamin D receptor is found in several cells that are critical for controlling the metabolism of calcium, phosphorus, and bone: intestinal cells, bone cells, kidney cells, and parathyroid gland cells." http://www.dummies.com/how-to/content/what-is-vitamin-d-and-... "Vitamin D’s best-known role is to keep bones healthy by increasing the intestinal absorption of calcium. Without enough vitamin D, the body can only absorb 10% to 15% of dietary calcium, but 30% to 40% absorption is the rule when vitamin reserves are normal." ... "Low levels of vitamin D lead to low bone calcium stores, increasing the risk of fractures." ... "In the intestines, the receptors capture vitamin D, enabling efficient calcium absorption. But similar receptors are also present in many other organs, from the prostate to the heart, blood vessels, muscles, and endocrine glands." http://www.health.harvard.edu/newsweek/vitamin-d-and-your-he... |