We're all familiar with the constant commercials and poster adverts on tips for weight loss, but I have the opposite problem. My metabolic rate is sky-high, and I am very active, but I cannot gain any fat deposits on my body. I could eat Crisco and still burn it off (well, of course it would clog my arteries but I digress). I have a swimmer's build without ever swimming. I'm toned, but, slim. Can anyone relate to this or point me in the right direction?