How does vitamin D help prevent osteoporosis?

Vitamin D helps the intestine absorb calcium and phosphorus into the teeth and bones, making them stronger and helping to guard against fractures. When the body has an insufficient supply of this vitamin, blood levels of calcium and phosphorus also drop, causing the body to leach these minerals from the bones. Most children get enough vitamin D in fortified milk, which contains 100 IU per 8-ounce glass.

Because this is only one-fourth of the 400 IU daily required to build strong bones, sunlight can provide the rest.

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