The fact remains that 95% of people going on diets to lose weight aren't successful in keeping it off long-term and the only method that seems to show significant success is surgery. I find it hard to believe that the only problem here is that fat people aren't aware they're fat. Harping on it in the way you're advocating just discourages people from doing anything healthy, since, you know, if getting slim is all that matters, why bother exercising if you're still fat at the end?