התמחויות

People Living In Higher Latitudes Require Fall, Winter Vitamin D Supplements

06/10/2002
By Elda Hauschildt

More aggressive vitamin D supplementation has been recommended for people living in northern latitudes, especially in the fall and winter when sunshine is limited.

Canadian researchers suggest that their limited Vitamin D exposure is associated risk of osteoporotic fractures and they point to elderly people as particular targets for supplementation. Investigators from the University of Calgary also do not recommend using elevated serum levels of parathyroid hormone as a surrogate marker for vitamin D insufficiency.

They explain the hormone is modulated by several other factors, particularly calcium intake. “Given that almost every person in our sample had serum 25-hydroxyvitamin D [25(OH)D] levels below 80 nmol/L at one point in the year, and that more than one-third of subjects had levels below the most conservative definition of vitamin D insufficiency, our findings support a recommendation for more aggressive vitamin D supplementation, particularly for elderly people and especially during the fall and winter months,” they concluded. Overall, it was found that the mean level of vitamin D rose in the spring and summer and declined in the fall when sunlight is less frequent and less intense in northern latitudes.

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