I eat them the same day. Your body needs fuel DURING any kind of sustained exercise. You simply can not convert stored fat to usable calories at a fast enough pace to meet your needs for sustained or intense exercise.
Nancy Clark addresses this in her book. It really is an excellent resource which I would highly recommend folks read if they are truly serious about propoerly fueling their bodies. I can't recall all the exact figures off the top of my head, but our bodies store a certain amount of glycogen in our liver and muscles. Once this is depleted, it MUST be replaced, or you will bonk. Most of that replacement has to come from foods we eat during exercise, not from our stored fat.
I'll try to remember to look up all the specifics this weekend, and transcribe some of them here.
Susan




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