fatchance:The sweet surrender when they realize the are not going to go on that diet ... when they give up on losing weight .... and lose the motivation to change the habits that made them fat, and will continue to make them fatter.
That day when they not only buy larger pants, but clean all the smaller pants out of the closet and donate them.
Mine gave away her pants went she went from 100 to 150'ish. She knew she would never get back down to 100 and was fine with 150, she loved the curves.... but........you of course will never stay at 150 if you keep the habits that quickly put 50lbs on you!
From there on out it's a real mind warp. At 150, my wife still made fun of fat people. But she then realized she was continuing to gain and couldn't give up the habits causing it. It's a surreal paradigm shift as the person is forced to grapple with the 'identity' that they're overweight. The world now sees THEM as fat. And the more they accept it, the more they start giving in to their gluttony and losing any desire to moderate their eating.
Once my wife started referring to herself as fat, actually verbalizing it, her eating habits really changed.
For example, my wife would never go to buffets or eat chips on the couch at night because "that's what fat people do". She'd pig out on sushi, cheese or whatever...but NO CHIPS. That was some lifestyle 'red line' in her head. All of that goes out the window once the identity of being fat sinks in. They realize they're not kidding anyone other than themselves. Now she can't go a night without Netflix and her potato chips. She started buying junk food she had never even thought she would be interested in.
My wife supposedly didn't like donuts. She used to make fun of how the women at work would get excited on Friday mornings because it was "Krispy Kreme day". Now she is the one picking them up for the team on her way to work; "they're actually kinda good".