Seriously, how is anyone dumb enough to be fat?

[Aractus]

Depending on how active I am I require much more calories than when I'm less active - I'd be very surprised if my BMR isn't within the normal range. I don't know what you mean by "naturally thin" - I know how easy it is to gain weight, but I also know how easy it is to lose it. I tend to eat a lot all the time, but when I want to lose kilos I eat lower calories foods. If you're sure that you eat 1200-1500 calories per day then you may have a slower BMR then average. But you can exercise - at home without equipment - and burn 500-600 calories in an hour or less (alternatively 90 minutes of gardening or a 90 minute brisk walk with the dog will also burn 500 calories). I never go to the gym I just exercise at home (although I do have weights and a bench-press).