I have found this peculiar with bike tours as well.  It also pisses me off because I usually do 70-100 mile tours and all the fatties who do the 10 -30 mile trails always eat the good food by the time the long-trekkers get there.  I actually frequent a bike shop who sponsors a large tour in my area, and it came up once.  The owner said he'd heard it before and was trying to do something about it. It's actually pretty annoying, as after doing that long of a ride, it is necessary to eat.