The metabolic pathways in humans are the same across the population. The rates can vary, but that's it. What I'm saying is that just because you have a gene (faulty or not, depends on which study you read) that is related to obesity, it does not mean you are bound to become fat. If you don't have a sedentary lifestyle as well, you can balance it out. It might take a little bit more effort but it's no excuse.Mmm, could we get a source for that? Metabolism plays an incredibly heavy role in how fat people can get, and that is something that is largely influenced by genetics (And metabolism isn't something that's easy to manipulate with our current publicly available medicine, either).
http://www.news-medical.net/news/2006/08/06/19289.aspx
These are extremes, if anything. You can see 40/day smokers living to their 90s and you see young athletes dropping dead at 25. Largely, however, you'll find fat people are unhealthy, mostly through things like high blood pressure or diabetes. It always seems a bit like clutching at straws when you see "fat people aren't always unhealthy"...On a side note, "being fat" != unhealthy. Sure, plenty of fat people are unhealthy, but all of society's "fat hate" is, for this very reason, stupid (It is quite possible for a fat guy to have an incredibly healthy heart and a skinny guy to have clogged arteries and poor lifestyle-induced diabetes; this goes back to the metabolism thing I was talking about). Also, check out sumo wrestlers. Very healthy, very fat.
