If I eat something too sweet, I also get a rebound afterwards that makes me even hungrier than before I ate the sweet thing.

My blood sugar likes to bounce around, so I bring a variety of things in my handy pannier. Payday bars work well for me, and I usually bring some walnuts or cheese. Lara Bars are great, but expensive. Oddly enough, Clif Shot Bloks don't rebound on me, but also expensive. Bananas are usually no problem for me either. When I eat while riding I really do make a picnic of it: I get off the bike, take off my helmet, eat a few things, watch the world go by.