there's something, i think it's called acetone, that you get on your breath sometimes when you are malnurished. when i was a kid i didn't like eating, and thought it was a waste of time. (i just wanted to ride my bike). my mom used to say, "i can smell acetone on your breath, you need to eat something!"
maybe it was just her way of getting me to eat, but i could smell it, too.

then again, maybe you just smell funny after a ride. maybe it's your "cycler's high" sending mixed messages.

by the way, i really like your quote.