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美《医学进修杂志》第55卷第4期(1979年4月)第248页报道:对在南极的白种人进行了血循环中25-羟基维生素D(25-OHD)的测定,发现在完全黑暗地带3个月以后,25-羟基维生素D数值大大降低。这些结果强调了紫外线对皮肤合成胆钙化醇维生素D_3的重要性,支持了老年人或移民适当接触阳光以预防维生素D缺乏这个观点。现已确知,钙吸收及排泄在人类有季节性变异。在英国,已观察到最大的排泄及吸收量是在
55, No. 4 (April, 1979), p. 248 Reporter: Determination of 25-hydroxyvitamin D (25-OHD) in the blood circulation in Caucasians in Antarctica and found that in complete After 3 months in the dark, the 25-hydroxy vitamin D value is greatly reduced. These results underscore the importance of ultraviolet light for the synthesis of cholecalciferol vitamin D 3 in the skin and support the idea that the elderly or immigrants have proper exposure to sunlight to prevent vitamin D deficiency. It is now known that calcium absorption and excretion seasonal variations in humans. In the UK, the largest amount of excretion and absorption has been observed