Hi My name is Tony, I am a56 year old man. I am 5'6 and 142lbs. I want to gain some more weight my ideal weight is between 150 to 155 lbs. I can not get to my desireed weight class because of my job. Im a ups driver. I gain weight but by the end of the week i have lost between 5 to 10 lbs. Im have been pn vacation for 2 weeks and noticed i gained 12 lbs and have kept it on. I go back to work couple of days . I know i will lose the weight by the end of the week. I want to take some weight gainer from GNC .I have taken before when i use to go to the gym. Would that be alright to do? I take fish oil & Men' OneDay vitimans. I m thin built with no health problems.