Re: weight loss
To tell if it's fat or just loose skin, pinch an area of skin between two fingers. If there is a lot separating the two fingers, it's fat. If there's a small space between your fingers, it's loose skin. If you eat healthy while you're growing and you don't gain more weight, then the loose skin will go away.
PhD student - Organic Chemistry
I don't read an entire thread before I respond; I try to answer the question quickly and concisely.