I have a question. Since we can test Vitamin D levels in people today, and
they can come out low, how do we know what our ancestor's levels were,
because of course we didn't have the technology back then. How do we know
what is "optimal" for vitamin D levels? Is it possible that our ancestors
got lots of sun, but still had low vitamin D levels as well?

--Elizabeth


-----Original Message-----

> Puzzling why we should be D deficient when fish-belly white European
> ancestors were healthy without supplementation.
>
> William