Some guys focus solely on pushing the weight in their sessions. This is because they think there is a strict correlation between the amount of weight lifted and an increase in muscular size… and for many guys, the size of muscles like the biceps and pectorals is the point of bodybuilding.

This is not always the case. The fact of the matter is that regardless of what you do in the gym, you can’t build more muscle tissue out of nothing. If you aren’t eating more than enough of the nutrients that your body needs to maintain itself and to build the new muscle tissue, you aren’t going to get bigger — no matter how heavy the weights you lift are. It’s that simple.

Now, contrary to the point above, others think that if size is their goal, then life should become a 24-hour buffet. They eat everything and anything in sight, in the hopes that it will help spark new muscle growth.

What these individuals need to realize is that, yes, they do require more calories, however, the body can only assimilate so many of those extra calories into lean muscle tissue. After that, the remainder will go toward fat mass. Your P-ratio is what determines the amount of surplus calories going to fat and the amount going toward lean muscle mass. Your P-ratio is partly influenced by genetic make-up — which is something you can’t change — but the changeable factors that affect are your workout program, your nutritional intake and the timing of your meals.

So if size is your goal, you need to make sure that you are eating enough to get growth in the first place, but not so much that with the additional muscle mass, you get a great deal of fat mass as well.