Maybe it's a factor but correlation does not equal causation. Many people in northern latitudes are Northern Europeans who seem to have higher rates of IBD. Is it in their genes or is it genes+geography?
My UC diagnosis came after 20 years in Delaware (near New Jersey and Maryland I know most people don't know where it's located). We moved to Florida a couple years later but UC did not get better (at all) due to southern climate.
I haven't had a cold or flu in 15 years, flu shot only half the time.
Post Edited (imagardener2) : 5/13/2015 5:38:12 PM (GMT-6)