In the dead of winter here in the Midwest many of us suffer from the Winter Blues. The days are shorter and gray and we are covered from head to toe with warm cloths, virtually eliminating our very best source of vitamin D.

In its most extreme form, Seasonal Affective Disorder (SAD) is prevalent when Vitamin D stores are low. SAD is associated with mood changes such as depression and anxiety, carbohydrate cravings, insomnia and lethargy, which increase during the winter months.

Commonly known, Vitamin D’s most important role is maintaining blood levels of calcium and phosphorus, which are responsible for skeletal health. However, recent clinical and epidemiological studies suggest that vitamin D deficiency may play a role in several conditions unrelated to bone, including SAD, prostate cancer, breast cancer, colon cancer, heart disease, hypertension, multiple sclerosis and type 1 diabetes.

Who’s at risk for deficiency?

Sunlight increases vitamin D synthesis in the body when exposed to bare skin. Those who restrict their sunlight and who have a chronic habit of using sunscreen are typically deficient. The use of a sunscreen with SPF as low as 15 reduces the rate of vitamin D production by 99.9 percent. Living in an area with a lot of atmospheric pollution, which can block the sun’s ultraviolet rays, also appears to increase the risk of vitamin D deficiency.

Strict vegetarians, alcoholics, those with dark skin and people with liver or kidney disease are also at high risk for Vitamin D deficiency. Those with darker skin tones merely need to stay in the sun longer than lighter skinned people to get the same amount of natural Vitamin D production.

In addition, Vitamin D deficiency is very common in people with digestive disorders (i.e., celiac disease, Crone’s disease, IBS, etc.). One in seven adults has been reported to be deficient in vitamin D. In one study, 42 percent of hospitalized patients under age 65 were reported to be vitamin D deficient. In this same study, even though the subjects were eating the currently recommended amounts of Vitamin D, 37 percent of them were still found to be deficient. Age-related decline in vitamin D status may be due to reduced absorption, transport or liver metabolism of vitamin D.

Medications known to cause Vitamin D deficiency: Anticonvulsants; Bile Acid Sequestrants (Cholestyramine, Prevalite, Questran); Cimetidine (histamine blocker); Colestipol; Estrogens (Combined); Flurbiprofen (NSAID); Gabapentin; Heparin; Hydroxychloroquine (Plaquenil); Indapamide; Isoniazid; Mineral Oil; Neomycin; Oral Corticosteroids; Orlistat; Phenobarbital; Sodium Fluoride; and Valproic Acid.

How much to take?

The best source of vitamin D is bare skin exposure to sunlight with no sunscreen. Naturally, this goes against our sun-phobic society. Sun exposure causes skin cancer, right?

Great food sources of vitamin D include fatty fish (mackerel and salmon) and fish liver oils (cod liver oil). Trace amounts are also found in egg yolks.

The best type of Vitamin D to take is Vitamin D3, also known as "cholecalciferol." Avoid "ergocalciferol," or "D2," as this is the synthetic form.

How much Vitamin D should you take? Most critical to the answer of this question is to get tested. How can you possibly know what you need unless you know your individual vitamin D status? You can get this simple blood test to determine your levels. A 25-Hydroxy Vitamin D blood test that reveals that less than 32 nanograms per milliliter has been shown to impair intestinal calcium absorption and subsequent skeletal density. Further studies have shown that Vitamin D blood levels less than 32 ng/mL are associated with impaired insulin resistance and beta-cell function. Optimal levels are 50-90 ng/mL. We feel Vitamin D status is so important to overall health and longevity that we have made it part of our standard panel we order for our patients.

If you do experience SAD, totally avoid the sun or have a higher risk of deficiency and want to give Vitamin D a try, 5,000 IU-10,000 IU per day would be sufficient. You cannot get enough Vitamin D from fortified foods and a multi-vitamin. Most of us make about 20,000 units of vitamin D after about 20 minutes of summer sun. This is about 100 times more vitamin D than the government says you need every day. If you do spend plenty of time outdoors in the summer, you may reduce this dosage during the summertime.

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Dr. Shannon O'Keefe is a graduate of Northwestern College of Chiropractic. She is certified by the Institute for Functional Medicine and is a practicing member of the American Chiropractic Association. She has 18 years experience in the Chiropractic and Functional Medicine field and has completed her Diplomat degree in Clinical Nutrition. An article she authored will be published in the April 2008 issue of Nutritional Perspectives: Journal on the Council of Nutrition of American Chiropractic Association for her research on bacterial and parasitic infections as it relates to disease. She co-owns and operates O'Keefe/Matz Chiropractic Clinic in St. Paul, specializing in treating patients with complex and challenging health issues including Depression, Diabetes, Rheumatoid arthritis, cholesterol and heart disease, M.S., Autism, Allergies, Heavy Metal Toxicity and Skin disorders. Visit www.okeefechiropractic.com or call 651.292.8072. Copyright

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