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Cycling vitamin D

Answered on August 19, 2014
Created June 14, 2011 at 1:28 PM

What's the best way to cycle vitamin D? Month - on, month - off? 3 months - on, 3 months - off? 6 months - on, 6 months - off?

Assuming northern country with little sunshine exposure in summer (office work) and almost no sunshine in autumn/winter/spring?

Would it be better to let the levels drop naturally in winter and not to supplement this time while helping to keep them even higher in summer with supplements? Or is it better to supplement in winter and get it naturally in summer (less variance in this case)?

4781cf8ae1bfcb558dfb056af17bea94

(4359)

on June 14, 2011
at 08:07 PM

Humans evolved for the Tropics. In the last hundred thousands years, humans ventured further north and the selective pressure that vitamin D deficiency placed upon them made them... white. So, I'm not sure it's a good idea to simulate N. European winters... Also, although they surely did experience diminished serum vit D in the winter, it was likely less then what modern people experience since we stay inside all day. Also, losing weight over the winters may have provided an additional source of vitamin D that is unavailable to modern people today.

B121fdbc1aaa6130f5bda3bf84e3ba2d

(952)

on June 14, 2011
at 04:05 PM

Well, you're right this assumption might be wrong. But I remember it from the healthyskeptic podcast where they actually discussed cycling as being a good thing. Besides, wasn't it a natural way of things for the 90% of Earth population except maybe areas like Asia-Pacific, etc.

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1 Answers

1
4781cf8ae1bfcb558dfb056af17bea94

(4359)

on June 14, 2011
at 03:57 PM

You are presuming that it is good to cycle vitamin D. Why?

I try to keep my levels constant at 45ng/ml. That means I "cycle off" only when I get significant amounts of summer sun.

There is some evidence (based on work by Vieth) that periodic drops in serum vit D are very bad.

B121fdbc1aaa6130f5bda3bf84e3ba2d

(952)

on June 14, 2011
at 04:05 PM

Well, you're right this assumption might be wrong. But I remember it from the healthyskeptic podcast where they actually discussed cycling as being a good thing. Besides, wasn't it a natural way of things for the 90% of Earth population except maybe areas like Asia-Pacific, etc.

4781cf8ae1bfcb558dfb056af17bea94

(4359)

on June 14, 2011
at 08:07 PM

Humans evolved for the Tropics. In the last hundred thousands years, humans ventured further north and the selective pressure that vitamin D deficiency placed upon them made them... white. So, I'm not sure it's a good idea to simulate N. European winters... Also, although they surely did experience diminished serum vit D in the winter, it was likely less then what modern people experience since we stay inside all day. Also, losing weight over the winters may have provided an additional source of vitamin D that is unavailable to modern people today.

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