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Vitamin D helps bones and ___________ grow strong and healthy. Low levels of vitamin D can lead to problems such as rickets, a deformity mainly found in ____________. Osteoporosis, the thinning of bone, is a common problem as people, especially women, get older.
But more and more research is suggesting that vitamin D might also help _____________ many diseases.
The easiest way to get vitamin D is from ____________. The sun’s ultraviolet rays react with skin cells to produce vitamin D. But many people worry about getting skin cancer and skin damage from the ____________. As a result they cover their skin or wear sunblock or stay out of the sun.Also, darker skinned people produce less vitamin D than lighter skinned ________________. Production also decreases in older people and those living in northern _______________ that get less sunlight.
Not many foods naturally contain vitamin D. Foods high in this vitamin include oily fish such as salmon, _______________ and mackerel, and fish liver oils.
Boston University researchers reported last year that farmed salmon had only about one-fourth as much vitamin D as wild salmon.
Small amounts of D are found in beef liver, ______________ and egg yolks. And some people take dietary supplements containing the vitamin. But most of the vitamin D in the American diet comes from foods with D added, like ______________.
In nineteen ninety-seven, the United States Institute of Medicine established levels for how much vitamin D healthy people need. It set the daily amount at two hundred international units from birth through age fifty. It set the level at four hundred I.U.s through age seventy, and six hundred for age seventy-one and over.
But some groups say these amounts are not ______________ enough. They are hoping that the new research findings will lead to new recommendations.
Research in the last several years has shown that ______________ levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers. Other studies have shown that people with rheumatic diseases often have low levels of vitamin D.
More doctors are now having their _______________ tested for their vitamin D levels. But as research continues, some experts worry that if people take too much vitamin D, it might act as a _______________. Also, skin doctors warn people to be careful with sun exposure because of the risk of skin cancer.