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"Let's shine some sunlight on these knowledge deficiencies: * Serum vitamin D levels have been dropping (as chronic inflammation has been increasing) over the last three decades -- has something changed in our diets? * Vitamin D deficiencies occur globally (not restricted to Northern latitudes or winter) -- related to diet? * Women are more vulnerable, because of cultural modesty in some countries, but males are still D-deficient. * A subset of people exposed to ample sunshine are still D-deficient. * Vitamin D deficient individuals also have elevated TNF. * Vitamin D deficiency and inflammation are risk factors in the same diseases. It seems that the simplest conclusion is that chronic inflammation leads to vitamin D deficiency, even though vitamin D deficiency may also contribute to inflammation."