your body can only burn fat so fast, if your demands for energy are greater than your fat store can supply at any given moment, then you will begin to metabolize lean mass (assuming you've tapped your glycogen stores). good news - you won't burn much and with sufficient caloric intake, you'll replace it. you'll never know it was gone.
empty calories are never a great idea, but calories are more important here than protein. protein needs are met a lot easier than we're taught. i'm certainly not vilifying protein, but if you overload on protein and slack on calories, you won't get the results that you want.
do your cardio. your heart's conditioning is more important than your other muscles.
40 years-old -- Never had a cavity
Gym 4x/week -- Muay Thai 3x/week -- Band Practice 1x/week -- Walking/Running Dogs Everyday
Every now and then I get a little booty.
I LOVE waking up.