^^^ depends on what of cardio you are talking about.
you never answered that.
if you go on the elliptical and jerk around for an hour then you can eat anything before and it won't be a big deal cause the elliptical doesn't do shit.
if you are gonna go do interval training on a track where you are sprinting a 1/4 mile then jogging, then sprinting, then jogging. then if you ate peanut butter or anything else for that matter it would end up on the track very quickly.
Nothing serious brother. I'm just planning on jogging my lazy ass to the gym (which is about 1/4 mile away). Once I get to the gym I will do one or two cardio machines for an hour tops. And then job back home.