It must be something with the sun here in Florida because I have very ergent diarrhea as well. I have no choice but to go outside about 4 times a day to walk the dog. I never associated the two until you mentioned it, but it sounds like a possibility. I noticed every day when I come home from school, I gotta go! It's about a half hour car ride and I have no AC in the car, so my windows are down & sunroof is open. Maybe it is is coincidence, I don't know.