By controlling your diet.
No that is impossible. You cannot gain muscle mass without ever gaining weight.
To eat potatoes, seems to work!
no,you cannot
no
ur a woman.
Yes
Yes.
You have to have a round face. Or try some blush.
Yes you will stop losing weight because you have lost too much and then will start GAINING weight if you work out too much.
Negative calories are a good calorie. They are the ones we can eat without gaining weight. Your bodies metabolism has to work harder to digest them, so that speeds up your metabolism which is a natural way to lose weight.
Some wrestlers, for example, eat certain weight gaining bars to go up in weight class.
yes if you want to get very fat