[big bad easter bunny]

Fat can only be gained by excess calories, you can get fat by eating to many of all types of calories(fat,protein and carbs). Your muscles use Glucose for energy no matter what the original source. The nice thing is mucles need calories all the time, fat just hangs around waiting to be used and doesn't really burn any calories to exist.

[Rytwyng]

Your muscles use Glucose for energy no matter what the original source

Actually, muscles can also burn fat directly. It takes a few weeks of consistent low carb/hi fat before the metabolic switch fully takes place, but when the fat burning enzymes do switch on, it feels great. Much less post workout soreness.

[Zipporah]

In theory ..you are right.. I suggest you read the New York Times article ..."Bid Fat Lie".. I may be wrong but the latest science says otherwise.