A combination of moving away from friends and not playing basketball anymore, aging, a new career, a couple nagging injuries, and my wife deciding that she loved to cook contributed to me gaining a bunch of weight about five years ago.
I was miserable. Tired, cranky, uncomfortable. I'm a big man, tall and thickly built, and always had a bit of a belly, but carrying another 30+ lbs made me feel like I just didn't FIT into the world, like every chair was an ill fitting pair of pants. It sucked.
After a couple years of effort I'm mostly back in shape now. Without sounding judegmental, I wonder if people who are really fat feel the same way I did, or are some people just fat and comfortable.