This is something I've been wondering. I'm sure there's an explanation but I can't find it.
When you go on a tempo run and most, if not all of your energy comes from glycogen. Back home you have a tea, then go to bed. Do you lose bodyfat or did you only deplete your glycogen stores until the next morning? I'd think it doesn't matter much: you also burn energy when sleeping, and this will be mostly from fat and protein sources. Though the amount is likely a lot less than from the run. What I'm aiming at is how interchangeable energy sources are. If you do tempo runs for whatever reason every night to create a calorie deficit (I'm sure those crazy people are out there) would you lose bodyfat at the same rate as just having a calorie deficit of the same calorie amount?