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About Vitamins |
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| Vitamin D: Best Food Sources - Sunshine, parsley, dark leafy green
vegetables, eggs, fish and fish oils, salmon, sweet potatoes, oatmeal, cod liver
oil and yogurt.
Vitamin D is a group of fat-soluble prohormones,
the two major forms of which are vitamin D2 (or ergocalciferol) and vitamin
D3 (or cholecalciferol). The term vitamin D also refers to metabolites
and other analogues of these substances. Vitamin D3 is produced in skin
exposed to sunlight, specifically ultraviolet B radiation.
| Vitamin D plays an important role in the maintenance of
several organ systems. |
| Vitamin D regulates the calcium and phosphorus levels
in the blood by promoting their absorption from food in the intestines,
and by promoting re-absorption of calcium in the kidneys. |
| It promotes bone formation and mineralization and is
essential in the development of an intact and strong skeleton.
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| It inhibits parathyroid hormone secretion from the
parathyroid gland. |
| Vitamin D affects the immune system by promoting
immunosuppression, phagocytosis, and anti-tumor activity. |
Vitamin D deficiency can result from; inadequate intake
coupled with inadequate sunlight exposure, disorders that limit its
absorption, conditions that impair conversion of vitamin D into active
metabolites, such as liver or kidney disorders, or, rarely, by a number of
hereditary disorders. Deficiency results in impaired bone mineralization,
and leads to bone softening diseases, rickets in children and osteomalacia
in adults, and possibly contributes to osteoporosis.
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More
Vitamin D
resources
Vitamin D refers to a group of fat-soluble alcohols that
contribute to the maintenance of normal levels of calcium and phosphorus
in the blood. The two major forms of vitamin D are D
Table of Contents. What is vitamin D? What are the sources
of vitamin D? What is the recommended intake
for vitamin D? When can vitamin D deficiency occur? Who may need extra
vitamin D to prevent
Explains functions of the vitamin with RDA intake
suggestions, symptoms of deficiency, and foods high in calciferol.
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Vitamin D
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Vitamin D
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