Vitamin D deficiency: A disease of modern civilization
Increased urbanization and migration have changed man's relationship to the sun. From the era of abundant unfiltered sunlight, when outdoor ways of life abounded , we have evolved to working from dawn to dusk in air conditioned offices , only to emerge and plunge into indoor gyms. During the rare sunshine exposures, either the maze of smoggy clouds or sunscreens and protective clothing, starve the body of supply.