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februarie 11, 2012 |
“Vitamin D is needed for absorption of calcium so that the mineral can take its place in bone and shore up the skeleton against fractures,” explains the TuftsUniversityHealth&NutritionLetter.
“Generally speaking, 90 percent of our vitamin D is made in our skin upon exposure to sunlight. But during the winter months, the sun’s rays are not strong enough to initiate vitamin D synthesis in northern climes. Worse still, hardly anyone middle-aged or older takes in the 10 percent of our vitamin D that the diet is supposed to provide.”
The U.S. National Institutes of Health therefore recommends that during the winter in the northern latitudes, people over 50 in particular should increase their intake of vitamin D by eating foods such as fatty fish and taking cod-liver oil or by taking vitamin D supplements, though not to exceed 2,000 international units, 50 micrograms, per day.