Better to eat before or after a.m. workout
I had advised my brother (who doesn't train any MA's, but lifts regularly for beach muscle) to eat breakfast before doing the morning run he's added to his normal routine. He googled my advice and found many sources saying it's better to do this workout on an empty stomach. His goal is to shed a few pounds so he can see the muscle he's worked to build.
Further googling reveals that there are self-proclaimed experts who say both that it is better to eat before an a.m. cardio session or to do the session on an empty stomach. Some are claiming that once the body uses up its already diminished glycogen stores, it will switch to lean mass as an energy source, others claim that it will utilize stored fat and not touch muscle tissue.
I apologize if this has been answered before (I did put a resonable effort into a search), but I would think this is something that's been studied and proven one way or the other. Does anyone know a source where I can draw a definitive conclusion on the matter?