Aug. 3, 2009

More and more studies are verifying the benefits of vitamin D for everyone at all stages of life and underscoring the premise that the majority of us are “D” deficient.

Recent contributions at both ends of life include a London School of Medicine study that adds to the evidence that higher vitamin D blood levels from supplements slow the aging process and the progress of age-related diseases.

There are several new studies on vitamin D and children. One of the most interesting shows that vitamin D deficiency appears to contribute to insulin resistance in obese African-American teenage girls. What’s more, increasing vitamin D levels can improve glucose tolerance, say researchers at the University of Alabama in Birmingham.

And according to a new Boston University study, vitamin D deficiency itself may be a contributor to the obesity epidemic among teenagers.

Mounting evidence for Vitamin D

There seems to be absolutely no question that most of us need more vitamin D and that getting sufficient amounts of the sunshine vitamin will provide protection against a host of deadly disease, perhaps even prolong your life.

I’ll be going into this information in greater detail in coming weeks as I prepare to publish a new book on the sunshine vitamin that is being kept in the dark. I promise you’ll learn everything about how vitamin D contributes to everything from healthy bones to a strong immune system to blood sugar balance and long life.

Get more sunshine

The message I want to convey today, here in the middle of summer, is how important sun exposure is to you vitamin D status.

The human body cannot manufacture vitamin D. It must get D from outside sources, and the sun is the best source. Best of all, it’s free!

You can get vitamin D from some foods and many foods, including dairy products, now have vitamin D added.

But why not get it from the sun when it’s so easy?

Ditch the sunscreen—for short exposures

The skin cancer scare has become a double-edged sward. While most light-skinned people need protection from long exposure to the sun, brief unprotected exposures will give you the vitamin D your body so desperately needs.

You don’t need a lot: Just go out for a 15-minute walk three times a week sans sunscreen. Be sure at least your face and arms are exposed and better yet, your legs, too.

Even if you’re very light-skinned, you won’t get burned in those brief exposures, but you will drink in that life-giving vitamin D.

Your body can store vitamin D or a certain period of time, so now in August you can store up your vitamin D against the winter when you’re not very enthusiastic about walking around coat-less and the sun’s rays are much weaker anyway.

Even if you’re really bulked up on your D levels, you’ll be running low by January or February. Low vitamin D levels have been shown to negatively affect mood, and that’s why many of us get the mid-winter blues. That’s nothing a week at the beach won’t cure, but if that’s not in your budget or work schedule, try some supplements.

Vitamin D supplements

All vitamin D supplements are not created equal. The natural form is vitamin D3 (cholecaliciferol), the type your body makes with sun exposure.

The American Journal of Clinical Nutrition says that vitamin D3 is the most powerful and most effective form of he vitamin, but, sadly, admits that most doctors prescribe formulations of vitamin D2 (ergocaliciferol), which has fewer beneficial effects and a shorter shelf life.

You’ll need to have your blood levels of vitamin D tested to determine if and how much of a supplement you should take. If you do, insist on a D3 formulation.

Better yet, get out there in the sun whenever you can.

–Kathleen Barnes