I can never seem to shift my weight, despite having a relatively healthy diet. I don't, however, moan about it as I fully accept that it's mainly due to sheer laziness, with regards to exercising.
I know my limitations/short-comings, and I just keep my mouth shut, when I know damn well I can fix it if I wasn't, ya know, too damn lazy ;)

I also refuse to go on one of those fad diets - the Atkins guy died of fat-bastardness-related problems! *rollseyes*