Gilthoniel has a point, ill-advised though actually going through with it may be. Fat cells actually produce estrogen from testosterone, which has a significant effect on puberty. For better or worse I was a fat kid, only really starting to do anything about it when I was 16 or 17, and yeah, as far as T damage, it definitely helped me compared to other people my age, and in my own family - my brother is 4 years younger than I am, but even before I started transition, people thought he was the eldest by an average of 5 or 6 years.
So yeah, I wouldn't recommend it, cause the worst long-term problems I've found have been joint problems - knees and hips, you'll end up with disordered eating, and unless you're gonna go uber-healthy and give your body a chance to repair compromised respiratory and circulatory systems you'll have those to deal with too, but as far as delaying puberty, it works.
Mina.