Is 10 minutes a day exposure to the sun with no sunscreen a bad thing or a good thing?
The jury is still out among a lot of health professionals, but one thing is certain: there are many people in our country that are deficient in vitamin D, the sunshine vitamin.
Vitamin D is a fat-soluble supplement needed to maintain normal levels of calcium and phosphorus in the blood. Over the last few years, vitamin D deficiency has been blamed for a number of conditions including depression, chronic pain, kidney disease, diabetes, osteoporosis, colon and breast cancer, and cardiovascular disease.
Much research has been done and much more will be done on the vitamin D debate. Many health professional are very excited about the health benefits of vitamin D and highly recommend it to their patients.
According to an article by Brian Alexander in the American Council on Exercise’s (ACE) Fitness Matters magazine, here are some things we know about vitamin D:
Vitamin D was discovered 87 years ago by a team of scientists at John Hopkins University who cured mice with rickets by feeding them cod liver oil. Oily fish like sardines remain one the few natural food sources of vitamin D.
It was later found that certain wavelengths of ultraviolet light prompts our bodies to synthesize vitamin D, eventually making a hormone called calcitriol.
Once this was understood vitamin D was produced synthetically, and foods, mainly milk, were fortified with it.
If you are Caucasian and expose 40 percent of your skin to midday summer sun in most of the United States, you will receive a dose of roughly 1,000 IUs per minute. An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes and biologicals (such as vaccines).
As we age, we gradually lose our ability to absorb vitamin D.
The darker your skin, the less vitamin D you will receive from the sun.
Where you live can affect your vitamin D levels. Those living north of Atlanta, Ga., do not get enough ultraviolet rays in the winter for their bodies to produce the vitamin D that they need. Therefore, it is important to get your level tested by you physician and let him suggest alternatives.
In the same ACE article, Boston University physician and vitamin D researcher Dr. Michael Holick said, "When I first heard the claims about vitamin D, I thought it was kind of crazy."
But Holick has become convinced of vitamin D’s effectiveness. "Heart, colon, prostrate, brain, all those cells have receptors for vitamin D, we also know it stimulates serotonin production [important in depression], and it is important in muscle function."
Other studies have been inconclusive on the positive health benefits of vitamin D. So the arguments on both sides of the debate continue.
All sides do agree on one thing: more research is needed.
source
Exposure to sunlight is an important source of vitamin D and It is especially important for individuals with limited sun exposure to include good sources of vitamin D in their diet.
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