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The form of vitamin D that we get from food or supplements is not fully active. It requires
conversion by the liver, and then by the kidneys, before it becomes fully active. This is why
people with liver or kidney disorders are at a higher risk for osteoporosis. When the skin is
exposed to the sun's ultraviolet rays, a cholesterol compound in the skin is transformed into
a precursor of vitamin D. Exposing the face and arms to the sun for 15 minutes 3 times a week
is an effective way to ensure adequate amounts of vitamin D in the body.
Severe deficiency of vitamin D can cause rickets in children and osteomalacia, a similar disorer,
in adults. Lesser degrees of deficiency may be characterized by loss of appetite, a burning
sensation in the mouth and throat, diarrhea, insomnia, visual problems, and weight loss.
Sources
Fish liver oils, fatty saltwater fish, dairy products, and eggs all contain Vitamin D. It is
found in butter, cod liver oil, dandelion greens, egg yolks, halibut, liver, milk, oatmeal,
salmon, sardines, sweet potatoes, tuna, and vegetable oils. Vitamin D is also formed by the body
in response to the action of sunlight on the skin. Herbs that contain vitamin D include alfalfa,
horsetail, nettle, and parsley.
Comments
Intestinal disorders and liver and gallbladder malfunctions interfere with the absorption of
vitamin D. Some cholesterol-lowering drugs, antacids, mineral oil, and steroid hormones (cortisone)
also interfere with absorption. Thiazide diuretics such as chlorothiazide (Diuril) and
hydrochlorothiazide (Esidrix, HydroDIURIL, Oretic) disturb the body's calcium/vitamin D ratio.
Cautions
Do not take vitamin D without calcium. Toxicity may result from taking amounts over 65,000 IU
over a period of years.
LINKS TO ONLINE STORES
Vitamin D, a fat-soluable vitamin, is required for the absorption and utilization of calcium and
phosphorus by the intestinal tract. It is necessary for growth and development of bones and
teeth in children. It protects against muscle weakness and is involved in regulation of the
heartbeat. It is also important in the prevention and treatment of osteoporosis and hypocalcemia,
enhances immunity, and is necessary for thyroid function and normal blood clotting.
MoonDragon's Health Information: Nutrition Basics - Vitamins Index
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MoonDragon's Health Information: Nutrition Basics Index
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