It’s also possible that some bodies do not use vitamin d very efficiently.
‘It’s also possible that some bodies do not use vitamin d very efficiently. ‘
True, but that’s not what the article says, it says, “reduced vitamin D from decreased solar exposure”.
Also...””A geographic association with northern latitudes has also been observed for multiple sclerosis and Crohn’s disease, other autoimmune diseases that may be mediated by reduced vitamin D from decreased solar exposure and the immune effects of vitamin D deficiency,” the authors wrote. “
Although there has been some link between rates of MS and northern latitudes (higher incidences in Minnesota, for instance), it certainly doesn’t explain the higher numbers in Colorado, which gets over 300 days of sunshine a year.