In a nutshell, if you're dieting, when nutrient timing matters the most, you have to pay attention to these things more. For ME, when dieting I get worn out from day to day activities. SO, when it's time to hit the gym, and I'm inevitably dragging ass, I just down my 2 scoops of Surge Recovery on the walk over to the gym instead of after lifting. The reason - because the surge releases a huge amount of glucose into the bloodstream and the pancreas shoots an insulin load all over! Then, I'm ready to go!
And, Fuzzyapple is right - when you're training at a high intensity level, your body's main energy source is carbohydrates (ie glucose). When your body runs out of the glucose immediately available, it turns to muscle glycogen and breaks it down to glucose. Glycogen --> glucose is a
"catabolic" reaction, and we all know how scary "catabolism" is lol!
Simple sugars (such as 2 scoops of Surge Recovery, a pop tart for Stu, some choco milk, whatever) will pretty much guarantee that your precious muscle glycogen will be left alone given that you're not drastically overtraining. Don't be afraid of simple sugars during the workout period, and make sure that all simple sugars are consumed before or during training. A lot of guys argue, also, that if you consume simple sugars post-workout, then you'll hinder fat loss by "capping" the process after training. For me, the only reason I drink my Surge before is simply to give me the energy to lift hard while dieting. Teh rest of the day I drag ass, but NOT during precious training! I also drink 2 scoops of whey post-workout, which helps too!
Rant - OVER!