The only to increase your mass is to take in more calories as was mention above... although this is not a healthly way of gaining weight... you 're at an age where your body growth is slow and whatever size you are that's how you are going to remain,, even if u have a high increase in calories its worst for you later in life... my only advisee is to gym a lot and take lots of protein supplements... eat healthy fruits and vegetables and drink lots of water... hope that helps... :)
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