Why do fat people say you'll gain all the weight back even if you stick to your diet? Exactly what it says on the tin; why do fatasses say that dieting doesn't work, reference faulty studies to support this specious claim, and try to discourage people from eating health and affecting positive change in their life? Like, why do they say that long terms diets are ineffective and even if you adhere to them, they fail? I don't get the "political" purpose of that.