Definitely agreed, Kabuki.
I used to think I knew something about nutrition. Now I've accepted the fact that I do not, and will not know everything there is to know about it, but I know a LOT more about it now. Since I've been using nutrient timing, proper post-workout nutrition, and eating 6 small meals a day, I feel like my performance in the gym has shot up big time. My recovery is awesome, and people think I'm on speed half the time because of the energy levels I sustain every time I get on the mat. Not nearly enough people view nutrition seriously enough. It is seriously a MUCH bigger part of your success as a martial artist, and a human being, than you think. It's not something to be shrugged off.
I can't stand, either, when people have the "George Burns" attitude. (Burns was a comedian who drank, smoked a ton, and pretty much did everything doctors hate, and lived to be in his 90s) They see guys out there who don't watch what they eat, drink a lot, etc., and think "Hey, they're doing fine, and they don't watch what they eat." Yeah, that may be so, but imagine how much better they'd be if they had a solid nutritional program.
Yes, training is what makes you a better fighter. You spar, you roll, you drill, you lift, and you run, but diet, and to a small degree, supplements are what enable you to do that day after day. If you have a solid eating plan, and a few proven supplements, then you can make every day of training as productive as possible. Look at Arlovski. He is one of the best fighters in the world, and if you look at his training, you can see why. The guys spends up to 6 hours a day training. Obviously, to be great, you need to train your ass off, go to sleep, wake up, and do it again. Again, without proper nutrition, you can expect to get sick, to run out of gas, to have unproductive workouts, to get injured easier, and when you finally DO have a good workout, a slow recovery time.
End rant.