[RockinRight]

Vitamin D deficiency causes brittle bones and has been linked to such diseases as prostate cancer, diabetes, rheumatoid arthritis and multiple sclerosis.

That might explain why MS and RA (and possibly the other diseases mentioned) is more common in northerly latitutdes.

[reed13]

My dad has MS so I’ve been doing a lot of reading on it. Some research indicates it occurs in clusters, while other research refutes this. Raw data isn’t available to make my own determination as versed as I would prefer. However, I lean toward the cluster argument. This would indicate environmental factors more specific than just latitude; however, it could be a localized issue in combination with latitude. Definitely something to consider.

[decimon]

That might explain why MS and RA (and possibly the other diseases mentioned) is more common in northerly latitutdes.

Likely so. But I don't think that people in the southern states should be sanguine. Variables include time of day, time of year, cloud cover...all kinds of stuff.