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1932: Vitamin D

Although the disease Rickets was known for centuries, the cause of it remained elusive until the twentieth century.

In 1919, Sir Edward Mellanby in Great Britain observed dogs who were fed a diet of mostly oatmeal and kept indoors away from the sun could be cured of the disease by providing cod liver oil.

Two other physicians, Huldshinsky and Chick found that children who were suffering from rickets could be cured by exposing them to summer sunlight or artificially produced UV light.

Since the idea of Vitamin D had become clear, its vitamin structure was identified in 1932 when Askew et al. were able to isolate vitamin D2  from a mixture of ergosterol (a compound found in fungi). 14

Nutritional Bite Hyperlink: 14

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Role in Health Support - Bone Health, Blood Sugar Control and Immunity.

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USANA The Cellular Nutrition Company.

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Vitamin D is an important fat-soluble vitamin. Very few foods in nature contain vitamin D. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis. Vitamin D obtained from sun exposure, food, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. The first occurs in the liver and converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as calcidiol. The second occurs primarily in the kidney and forms the physiologically active 1,25-dihydroxyvitamin D [1,25(OH)2D], also known as calcitriol.

Vitamin D promotes calcium absorption in the gut and maintains adequate serum calcium and phosphate concentrations to enable normal bone mineralization and to prevent hypocalcemic tetany. It is also needed for bone growth and bone remodeling by osteoblasts and osteoclasts. Without sufficient vitamin D, bones can become thin, brittle, or deformed. Vitamin D sufficiency prevents rickets in children and osteomalacia in adults. Together with calcium, vitamin D also helps protect against osteoporosis that can occur during aging.

Vitamin D has other roles in the body, including modulation of cell growth, neuromuscular and immune function, and reduction of inflammation. Many genes encoding proteins that regulate cell proliferation, differentiation, and apoptosis are modulated in part by vitamin D. Many cells have vitamin D receptors, and some convert 25(OH)D to 1,25(OH)2D.

Serum concentration of 25(OH)D is the best indicator of vitamin D status. It reflects vitamin D produced cutaneously and that obtained from food and supplements and has a fairly long circulating half-life of 15 days. 25(OH)D functions as a biomarker of exposure, but it is not clear to what extent 25(OH)D levels also serve as a biomarker of effect (i.e., relating to health status or outcomes). Serum 25(OH)D levels do not indicate the amount of vitamin D stored in body tissues.

Food sources include: Cod liver oil, swordfish, salmon, fortified orange juice, milk and yogurt, and egg yolks.


6-5-10 Yogurt

6-5-6 Eggs

And how does all of this relate to our Children, critical is the word that comes to mind in the developmental stages of life for our Toddlers & Teens. We are literally building their foundation of health everyday, everyday, not some days, everyday.

If you could greatly reduce potential health chronic conditions from developing in your Child's future would you be willing to do so. It starts with daily eating and lifestyle habits.

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