Originally Posted by hamster

Bonk training is somewhat different. I'm not suggesting you actually bonk. I'm suggesting that you don't eat unless you really have to.

Look at this:

Impact of carbohydrate supplementation during endurance training on glycogen storage and performance - Nybo - 2009 - Acta Physiologica - Wiley Online Library

In previously untrained males performance and various muscular adaptations were evaluated before and after 8 weeks of supervised endurance training conducted either with (n = 8; CHO group) or without (n = 7; placebo) glucose supplementation. (...) resting muscle glycogen increased (P < 0.05) to a larger extent in the placebo group (96 ± 4%) than CHO (33 ± 2%).