The reference is in the chapter regarding exercise (I love that chapter!
).
I understand the idea behind what Dr. A's saying: you have to burn the fuel in your body and if you don't have fuel to burn, you run out of gas (glucose stored?). I know I just read an article about that recently on line that had information about to do or not to do about eating before hand---of course I didn't bookmark it (dummmmm)---it came down to knowing your body and knowing what you can and cannot do.
I have to have a small something before I exercise if I do it in the morning, otherwise, I'm nauseated and heading for the floor.