There's various arguments for losing weight and training that involve hitting the wall of glycogen depletion, or "bonking":
Basically, you don't lose weight without depleting about 2000 calories worth of stored glycogen.
Low-carb diets maintain that state and are bad for muscle. Exercise can be used to deplete the store. When followed by more exercise, you're burning fat. Eating to recover the store keeps your
muscles happy. It's good to know what your maintenance level of calories is: what you burn just
sitting at your desk, how many calories you eat and when, as well as how many calories your exercise burns.
The articles suggest that depletion and the switch from glycogen to fat as sources for energy is immediate and binary. It's fair to assume they dovetail. Bonk Training is about pushing the depletion hard and training with low blood sugar and can damage the central nervous system.
Glycogen aware weight-loss likely doesn't have to be extreme. Exercise at 130bpm long enough to burn some calories after you've made a huge dent in the glycogen store. They suggest you exercise long after a meal, when insulin is low for a long time. Some suggest two workouts, with the second coming after no food or only after an hour and a half of a moderate meal: to avoid building the glycogen store up all the way.
http://www.active.com/running/Articles/Should_you_bonk_on_purpose_.htm
http://www.superskinnyme.com/Weight%20Loss/Exercise/Cardiovascular%20Exercise/Bonk_Training.html
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