Monday, August 24, 2015

Vitamin D in human body

Vitamin D is a fat soluble steroid hormone precursor that contributes to the maintenance of normal levels of calcium in the blood stream by increasing absorption of calcium from food and reducing urinary calcium loss (reabsorption by the kidneys).

Both effects keep calcium in the body and therefore spare the calcium that is stored in bones. When necessary, vitamin D transfers calcium from the bone into the bloodstream, which does not benefit bones.

The bones grow denser and stronger as they absorb and deposit the calcium.

Vitamin D is well known for its primary physiological role of regulation of calcium homeostasis in maintaining bone health.

Therefore, vitamin D prevents muscle aches, bone pains, chronic fatigue and osteoporosis.

Vitamin D plays a vital role in the normal functioning of the immune system and blood cell formation and also helps cells "differentiate"—a process that may reduce the risk of cancer.

Growing evidence indicates that vitamin D is also involved in modulating body composition, energy homeostasis, and insulin sensitivity.

From animal and human studies, researchers have hypothesized that vitamin D may protect people from tuberculosis, gum inflammation, multiple sclerosis, autoimmune arthritis, and juvenile diabetes.

Vitamin D controls the growth of normal as well as cancerous cells. It is important role in the prevention of various cancer especially cancer of the colon, prostate pancreas and breast.

Vitamin D is also needed for adequate blood levels of insulin. It stimulates the production of insulin form insulin producing cells in the pancreas.

Vitamin D isn’t actually a vitamin D produced by the body. Vitamin D3 is synthesized in human skin from 7-dehydrochoelsterol following exposure to ultraviolet B (UVB) radiation with wavelength 290 to 320 nm.

This fat soluble vitamin is transported to the liver and kidneys and become activated vitamin D.

There are two sources of vitamin D available for the human body; endogenous synthesis in the skin from exposure to sunlight and exogenous consumption in foods and/or pharmaceutical supplements.
Vitamin D in human body 

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