The sun­shine vi­ta­min

Canadian Running - - ALEX HUTCHINSON -

Even in Canada, most of us can get enough vi­ta­min D dur­ing the sum­mer sim­ply by get­ting out­side for 10 or 15 min­utes daily in the mid­day sun. But when win­ter re­turns, should you start pop­ping mega­doses of vi­ta­min D sup­ple­ments to keep your lev­els up? Af­ter all, a re­cent meta-anal­y­sis added pro­tec­tion from cold and f lu in­fec­tions to the list of po­ten­tial ben­e­fits. But a new study by re­searchers at Liver­pool John Moores Uni­ver­sity in Britain, pub­lished in Medicine & Sci­ence in Sports & Ex­er­cise, of­fers a note of cau­tion: pro­fes­sional ath­letes who took 70,000 IU of vi­ta­min D per week suf­fered ad­verse ef­fects that, in some cases, left them with lower vi­ta­min D lev­els than those tak­ing lower doses. A typ­i­cal drug­store sup­ple­ment con­tains 1,000 IU; Graeme Close, the se­nior au­thor of the study, sug­gests a de­fault of 2,000 IU per day in the win­ter for those liv­ing in the north­ern hemi­sphere, and “sen­si­ble sun ex­po­sure” in the sum­mer.

Newspapers in English

Newspapers from Canada

© PressReader. All rights reserved.