Water fluoridation isn't very popular in many regions of Europe, yet incidence rates for ulcerative colitis are quite similar to those found in Canada and the United States.
As for the disparity in the incidence of IBD between the under-developed regions of the world and the West, one must recognize that numerous differences exist beyond water fluoridation. The West and Latin America, Africa, the Middle East and South and Southeast Asia differ with respect to racial composition, rates of antibiotic use, sunlight exposure, diet, et cetera. One must also consider the poor medical infrastructure and under-reporting of conditions in impoverished regions that might render epidemiological data unreliable.
Post Edited (Delarge) : 10/19/2010 11:47:25 AM (GMT-6)