- Vitamin D allows the body to absorb calcium—that’s why milk is often vitamin-D fortified. Maintaining healthy levels of vitamin D can increase bone mass and strength, preventing osteoporosis and broken bones. It can even slow the deterioration of cartilage that causes arthritis.
- It strengthens the immune system, giving the body greater ability to reduce inflammation from infections, and it increases muscle strength.
- Vitamin D has been connected to the prevention of colon cancer, and there is some evidence that it can help protect people from prostate and breast cancer as well.
- Medical research suggests that it may have a role in preventing diabetes, hypertension, glucose intolerance, and multiple sclerosis.
Where do you get vitamin D?
The easiest way is by getting some sun. Vitamin D is produced in the skin after exposure to UV rays. You need 5-30 minutes of midday sun (between 10 am and 3 pm), two or more times a week—easy enough if you can go outside for your lunch break. However, if you live north of the 42 degrees latitude line (north of Boston and Northern California), from the months of November to February, the sunlight is not strong enough to produce any vitamin D. But if you live south of Los Angeles or South Carolina, the sun is strong enough all year long.
Many people who live at northern latitudes or work inside all day are often vitamin D deficient because they don’t get enough sun and because the vitamin also does not occur naturally in very many foods. It is, however, added to some foods like vitamin D fortified milk and cereal (milk fortification was originally introduced in the US in the 1930s to fight rickets, or softening of the bones caused by vitamin D deficiency). You can find it naturally in cod liver oil, egg yolks, salmon and other fish, beef, and cheese, but consider taking a vitamin-D supplement to make sure you are getting enough. If you take a calcium supplement, consider taking one that includes vitamin D.
Facts about vitamin D can be found The National Institute of Health website’s Dietary Supplement Fact Sheet
—Written by Freelancer Kristen Hewitt