Physician visit: You'll want to be checked for malabsorption / maldigestion; subtle entities like adult cystic fibrosis and celiac sprue can sneak up on a young man. I will also assume you are not hyperthyroid. Plus, are you sure you want to be "fat"? The ideal image for a young man's body, around the world, is lean and adequately muscled. Stay fit; you may have a light-framed "runner's body", a big plus.
Answered 6/5/2016
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