Here is a two word sentence/saying that as a cyclist I never want to hear again: Carb Loading. As in, "hey with that big ride coming up you should be carb loading." Nor do I want to hear its similarly used, "make sure you load up on carbs before that ride." Ugh.
After my personal experiment on the 2011 Cycle Oregon and nearly six months I can and will say it: carbs (especially loading on them) is a joke and having gone (mostly) paleo, I feel better than ever, weigh less than ever, am stronger than ever, and just do not drink the "whole grains are good" kool aid any longer.
In fact, my last major episode of "carb loading" (in helping with a science experiment) made me feel so shitty the next day it was absolutely telling: Is THAT how I want to feel? NO!
If you need the proof, do it for a month or two, watch the documentary Fat Head, read the book Wheat Belly, and get informed. Pretty amazing stuff out there to be learned that will likely have the folks at CONagra crapping their grain-y pants.