The heat does me in as well, regardless of diet. If I'm not off the road by 10am, I know it's going to be approaching 100º most days, and I'm in for a listless day of just chugging water to prevent myself from felling like crap. But jambalaya won't make me vomit or fall asleep at 4:30, so I guess I'm in a happy medium. I also classify as "bigger," and the "four hour rides and less no eating" thing is just ridiculous. It's not time or distance, it's intensity... and heat. If it takes me 5-6 water bottles to get through a 62 mile ride because it's +95º, yeah, I'm eating something.