Believing that you don't care about your health, is demoralizing. That its not from your own assessment of genuine internal feelings but being convinced about it by those you trust with your life turns you into a sucker.
Though you may not be consciously aware. There's a part of you that knows the score. Therefore there is an internal sense of opposite understandings. This can create a yawning chasm between what you want to do and what you can do. And there you stay, alienated from your own physicality and putting into effect positive change that could stick.
It doesn't matter what anyone else thinks of those changes, it's the fact that you cannot do what you want to do. That you should start from you because you are important enough for that.
The 'diagnosis' of greedy and lazy actually acts as a kind of rationale or excuse as those who taunt fat people like to state.
Rather than being able to perceive and perhaps deal with the real barriers.