Sunday, December 23, 2012

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Vitamin D

Vitamin D: Wonder Pill or Overkill?
Wouldn’t it be great if one vitamin could build stronger bones and protect against diabetes, multiple sclerosis, cancer, heart disease, and depression? Or even help you lose weight? Researchers have high hopes for vitamin D -- which comes from our skin's reaction to sunlight, a few foods, and supplements. Learn the facts in the slides ahead … and see who's at risk for a "D" deficiency.


Vitamin D Boosts Bone Health

Vitamin D is critical for strong bones, from infancy into old age. It helps the body absorb calcium from food. In older adults, a daily dose of "D" and calcium helps to prevent fractures and brittle bones. Children need "D” to build strong bones and prevent rickets, a cause of bowed legs, knock knees, and weak bones.



Vitamin D and Multiple Sclerosis

Multiple sclerosis (MS) is more common far away from the sunny equator. For years, experts suspected a link between sunlight, vitamin D levels, and this autoimmune disorder that damages the nerves. One newer clue comes from a study of a rare gene defect that leads to low levels of vitamin D – and a higher risk of MS. Despite these links, there's not enough evidence to recommend vitamin D for the prevention or treatment of MS.


Vitamin D and Diabetes

Some studies have shown a link between a low vitamin D level and type 2 diabetes-- the more common version of this blood sugar disorder. So, can boosting your vitamin D levels help ward off the disease? There's not enough proof for doctors to recommend taking this supplement to prevent type 2 diabetes. Excess body fat may play a role in diabetes and low levels of vitamin D.


Vitamin D and Weight Loss
Studies have shown that people who are obese often have low blood levels of vitamin D. Body fat traps vitamin D, making it less available to the body. It's not clear whether obesity itself causes a low vitamin D level or if it's the other way around. But one small study of dieters suggests that adding vitamin D to a calorie-restricted diet may help overweight people with low vitamin D levels lose weight more easily.

Low "D" and Depression

Vitamin D plays a role in brain development and function. One promising study showed that large doses of vitamin D could lessen the symptoms of mild depression. But other studies show mixed results. The best bet is to talk with your doctor about whether vitamin D could ward off the symptoms of depression.

Dining With Vitamin D

Many of the foods we eat have no naturally occurring vitamin D. Fish such as salmon, swordfish, or mackerel is one big exception -- and can provide a healthy amount of vitamin D in one serving. Other fatty fish such as tuna and sardines have some "D," but in much lower amounts. Small amounts are found in egg yolk, beef liver, and fortified foods like cereal and milk. Cheese and ice cream do not usually have added vitamin D.

Vitamin D and Heart Disease

Low levels of vitamin D have been linked to a greater risk of heart attack, stroke, and heart disease. Still, it’s not clear whether boosting vitamin D will reduce heart risks and how much vitamin D is needed. Very high levels of vitamin D in the blood can actually harm blood vessels and the heart by increasing the amount of calcium in the bloodstream.

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