I used to be one of those people, but it was so long ago I don't remember for sure. This is what I am now. My body swells like a balloon, and only my spirit gets smaller and more emaciated, rattling around in its empty house, frightened by the space around it.
I notice a lady in the store buying non-diet groceries. She's pretty and cheerful and relaxed. I imagine her going home, opening the food she's bought, and eating it with that same serene brightness in her face, never thinking to run and kneel in front of the toilet like a devoted disciple bowed in penance for her sins. Maybe she has none.