QUOTE(Awakened_Angel @ Mar 7 2012, 08:42 AM)
by taking calories, he weight gain as in what? muscle or fat? and is it possible for me to increase my muscle mass at the same time reduce body fat? or it is different set of game ??
Aha! Now that is where the importance of the source of your calories comes in. If you're just contented with gaining weight (not being so particular on whether it's 40% muscle, 60% fat or anything), it's simple. You just eat whatever you like, however you like it. Just don't go whining to everyone you meet about how you can't get 6 pack abs or how your chest looks like it's about to drop off / touch your knees.
Increasing muscle mass at the same time reducing body fat is indeed a different set of game because, depending on your current and target body fat %, you would probably be
losing weight instead of gaining weight in order to reduce body fat (a.k.a. cutting, as coined by bodybuilders). I'm not sure what your goals are or what you'd want to look like but the technique of getting there is basically around the ratio of 60-70% what you put in your mouth and 40-30% your exercise program.
Most people lose a bit of muscle mass when they try to drastically reduce body fat and for a person who's not that into bodybuilding, it's normal. Normally, I'd suggest focusing on one at a time (normally people go for building muscle mass first - this is where you gain weight) then shift your phase into the other (losing body fat - where you lose weight). Technically, both (gaining muscle mass & losing bf) will still be occuring at the same time, it's just that one will be more significant than the other.
Assuming you're aiming for the model look or Brad Pitt in Fight Club, I'd recommend
this website. The dude basically advocates intermittent fasting as a guideline to gaining muscle mass and losing body fat at the same time.
All in all, it's actually something that requires trial and error to see what suits you best but in a nutshell, you just need to remember what you put in your mouth will basically flow to what your body looks like

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This post has been edited by durianhead: Mar 7 2012, 12:13 PM