Runner's World (UK) - - Contents -

Shorter days mean fewer rays, so it’s no won­der that vi­ta­min D de­fi­ciency peaks in win­ter. The ‘sun­shine’ vi­ta­min plays a role in bone health and the im­mune sys­tem, and new re­search shows in­suf­fi­cient D af­fects mus­cles, too. A French study re­vealed that de­fi­ciency ac­cel­er­ated mus­cle loss, while a US re­view4 found D3 sup­ple­ments led to strength gains of 1.37-18.7 per cent in ath­letes. Study dosages ranged from 600-5000iu (15-125mcg), which you are un­likely to achieve through diet. In fact, Public Health Eng­land says peo­ple should con­sider a daily sup­ple­ment in au­tumn and win­ter.

SHINE ON Keep your Vi­ta­min D lev­els topped up in the win­ter months

● Only in win­ter 5% ● All year round 19% ● No 76%* Do you take vi­ta­min D sup­ple­ments?

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