November is the beginning of "Vitamin D Winter" in the Northern Hemisphere -- a four-to-five-month period where people?s vitamin D levels begin to plummet because there is little UVB in winter sunlight to initiate natural vitamin D production in the skin. Humans make and store abundant vitamin D with sun exposure to the skin in the summer, but overzealous sun protection blocks vitamin D production and puts people in a vitamin D deficit at the beginning of winter that only gets worse by the time spring sunshine returns. The winter season of colds and flu results from reduced resistance to infections caused by low blood levels of vitamin D during the dark months, scientists interested in vitamin D believe. Randomized clinical trials, the highest level of proof in medicine, have shown that vitamin D improves resistance to infections such as flu and tuberculosis. Insufficient vitamin D is also linked to a wide spectrum of diseases that include diabetes, arthritis, multiple sclerosis, a number of other autoimmune diseases, and also to several types of cancer including breast cancer and colon cancer. In the winter, when little UVB is available from outdoor sunshine, Vitamin D expert Dr. Robert Heaney, Professor of Medicine at Creighton University and Research Director of GrassrootsHealth recommends oral intake of ?35 IU of Vitamin D3 supplement per pound of weight, per day.? Dr. Lunney reported ?saving money on Canada?s healthcare budget doesn?t necessarily mean cutting back on anything; merely increasing people?s dosage of vitamin D can keep people healthier, requiring fewer visits to either the doctor or the hospital.?
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