For me, a big part of training is what I DON'T consume when it isn't needed. I don't have carbs when I don't need them, so that when I do need them (During and after training) my insulin sensitivity will be through the roof. I treat caffeine the same way. I need stimulants to get through my sessions, so I have hardly any caffeine at other times. This keeps my total dosage down but still gets me through my workout.
I've also found that as my sessions get longer, it makes a big difference to get carbs during training. I've been using granola bars and chocolate milk and it really helps on those last couple movements. I didn't need to think about this stuff when my sessions were 45 minutes, but now that I'm going back to 1-2 hour sessions it makes a huge difference.
I do the same thing with using stimulants only when needed, helps them work more effectively when you do need them. I like a straight shot of honey for quick carb energy. Used it when I was a distance runner and nothing that powerbar, hammer nutrition, etc could package worked better.