The fact that your body looks different now than it did when you were born should be evidence enough  My favorite argument against "I been this way muh whole life" fats is no one was born 300lbs. And, of course, there are studies about why some babies are born bigger, which is mothers are obese and that causes fat babies. So it was your parents fault up until you could control your own intake, but what's your excuse after that? And no, no one is deserving of anything in life. That's why respect and admiration are earned, not freely given. EDIT: "they should spend as much time exercising as they do complaining" - I'm gonna do this one week and see what happens. I'm gonna count up all the times I hear a fat person complain, probably my SO's mom, and work out that amount of minutes. I'll honestly probably die or lose 50lbs =/