im 24 years old guy...i weigh 51k, 5'6" in height...is it normal, since i felt im too thin...i am health conscious (eating right foods avoiding chemically processed foods), sleep right, and im feeling well, that i dont get sick(e.g. colds, fever, sore eye, etc) even my fellows were sick and iam always in contact with...i like to gain...is it due to my active thyroid gland that makes me thin how much i eat, do the nutrients absorb in my body???please help me, bcuz i am always dreaming of gaining weight