Toggle Health Problems and D

The Shadow Rule – you make Vitamin D when you are taller than your shadow – 1992

Grassroots Health Oct 2015 email

A general rule of thumb?
When you are taller than your shadow, your body is able to make vitamin D


Atmospheric sun protection factor on clear days: its observed dependence on solar zenith angle and its relevance to the shadow rule for sun protection 1992

The shadow rule: a simple method for sun protection. 1998

“Thus, when a person's shadow is shorter than the person is tall, the intensity of UVR from the sun is more likely to cause sunburn.”

Actually: Generate about 1/2 as much vitamin D when shadow is as long as you are tall

Also - Less shadow ==> less Vitamin D

See also VitaminDWiki

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Overview UV and vitamin D
Vitamin D vs angle of the sun

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