Διόρθωσε με αν έχω λάθος (πολύ πιθανόν) αλλά για να χάσεις λίπος πρέπει να ανεβάσεις μεταβολισμούς και να πέρνεις λιγότερες θερμίδες απ'όσες καίεις. Για να κτίσεις μυική μάζα πρέπει να ρίξεις μεταβολισμό και να πέρνεις περισσότερες θερμίδες απ'όσες καίεις, για να έχεις κάτι να κτιστεί...

Από Tom Venuto - Feed the Muscle, Burn the Fat:

The “skinny” on gaining muscle while losing fat
Supplement advertising in bodybuilding and fitness magazines has brainwashed
many people into believing that gaining muscle and losing fat at the same is an easy and
common occurrence (with the right "miracle" product, of course). IT'S NOT! It's quite
rare.
It's common to see a large decrease in body fat with a small increase in lean body
mass. It's also common to see a large increase in lean body mass with a small decrease in
body fat. But one thing you will almost never see is a large increase in lean body mass
and a large decrease in body fat at the same time (especially if you are drug-free or
genetically average).
Because so many people can’t make up their minds and they flip flop back and
forth between trying to gain muscle and trying to lose fat, they sometimes end up
accomplishing neither! Clear goals and a laser-like focus are critical if you want to make
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the most efficient use of your time, energy and effort. Make up your mind and follow
through!
It’s physiologically impossible to lose fat and gain muscle at the same moment in
time. You can't gain muscle in a calorie deficit and you can't lose fat in a calorie surplus,
it's that simple.
Here’s an illustration: The average man with a daily maintenance level of 2800
calories needs approximately 500 calories extra to gain weight – a total of 3300 per day.
To lose weight, he needs about a 500-calorie deficit – a total of only 2300 calories per
day. The difference between these two nutrition programs is 1000 calories! They are at
completely opposite ends of the spectrum.