The answer is simple. They just don’t care. I’m sure all of us here have our cheat days and cheat meals but at the end of the day being fat is unacceptable so you rein it in.
on cheat days I usually stuff myself with food that is objectively healthy, but high in calories and animal fat, huge (for normal people standards) portions and usually second portions. So it probably makes me slightly fatter on such days, but I feel no regrets about it because I made healthy food choices, it probably even benefits me since I am not fat anyway. Last night I had a huge dinner of rice, very high grade beef, feta cheese for more flavor, and as a desert a home made smoothy where I blended up mineral water, grapes, kiwi, avocado, and pineapple, kept all the fibre inside the smoothy, so it was like a thick delicious pudding. Probably has insane off the charts levels of natural fructose, but that's why I only have it like once a week. Still I think this cheat meal is overall still very healthy compared to the average fatsos cheat meal