Also said study (there was more than 1?) was a questionnaire, so about as scientific as telling someone whatever someone wants to, which, as with polls, has no way of factoring in the fact that people lie. A lot. So if given over to a stigma, people might rather not fess up that they sought treatment.
When a wide swath of people on the map that overlaps the Bible Belt have a greater propensity for obesity (despite being in warmer climes), alcoholism, drug abuse, criminality, lesser education, higher unemployment, inbreeding, and other deviancies, that might be a more fair indicator that something isn't functioning optimally in ye olde noggin.