There are several important, only recently understood, and not yet widely
appreciated, points to be made about vitamin D:
Healthy/desirable levels are much higher than was thought. Laboratory
reference ranges for 25-hydroxyvitamin D (25(OH)D) are still stated at
around 40-100 nmol l-1. But people who live in equatorial regions, and
spend much of their days in the sunlight (farmers and lifeguards, for
instance), consistently show levels over 100 nmol l-1, and even above 200
nmol l-1. Because humanity evolved in such an environment, it is clear
that the vitamin D exposure that parallels the ‘Stone Age diet’, as the
environment in which humanity evolved, was much higher than the levels we
have now come to regard as normal. Yet vitamin D deficiency is widespread
in developed countries, and food fortification is disappointing as a
solution to this.
http://www.mult-sclerosis.org/news/Jan2002/FullTextVitaminDReassessment.h
tml

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