This is just from my experience: I actually began to lose weight when I consumed some carbs while cycling. I think it enabled me to keep a faster pace (not "bonking") and ride faster, farther and for a longer duration; which therefore enabled me to burn more calories overall. The eating while cycling thing is a bit of a learning curve. It is a balancing act to consume just enough to keep you fueled while not overdoing it and thwarting weight loss. I am still continuing to experiment, but one thing that I have noticed is that less seems to be more. Eating just enough seems to be the key, at least for me.