| Yeah I also think it is mainly eating habits but the whole separated twins thing goes against that!
I grew up in a skinny family and I got chunky while they all stayed stick thin. May be my illnesses, may be my plain lazyness, may be I was adopted (since they are all dark and I am fair as can be I was always thought that!)... I don't know. But I have always looked like I eat twice as much as my sister while really I eat less than her. But I also move less than her...
Anyhow, I thought it was very interesting to read, and it is definitely something to think about. And I also think just because you have a genetic predicposition doesn't mean you can't try to fight it.
Camy | 
