well that's where we're running into a lot of theories and guesstimates. The ECA wont just burn fat only, if it's being catabolic that means everything is up for grabs including muscle for energy.
Now incorporating glutamine, HMB, or BCAA's (all known to be anticatabolic agents) will that help preserve muscle? Yes. Now here's my question that nobody has ever been able to answer. If these agents are anticatabolic, it's because they are being used for energy right? Well if you're using that for energy, that should mean you really aren't using the fat for energy then. right? So actually by taking these products, you preserve muscle but you really don't allow fat to be burned, b/c again these products are being used as your energy source. My question is... is my theory right? sounds logical to me...