This is a really interesting thread and something I'm spending a lot of time focusing on learning to be a "thin person"
I was obese (bmi 31) and lost weight with mounjaro. I stopped the drug in October and was determined not to regain. My bmi is 21.5 currently and I have maintained that for 4 months.
I've spent a lot of time chatting and watching my slim friends and family. This is what I've learned and its worked for me to maintain...
No "mindless" eating. Ie passing a biscuit and eating it without barely noticing. All food is now an event that I sit down and savour.
Smaller portions.
Home cooked food
Prioritising protein
Being hungry before mealtimes
Moving (a lot) more. Rather that do 4k steps a day at working from home, then watching tv in the evening. I now cycle to the office and I run 1-2 times a week. I always make sure I hit 10k+ steps a day and prioritise this.
If there is a meal out, I will cut back in the day to compensate for the calorific meal.in the evening and perhaps do a run the next day too.
I think it's a mindset and the reversal of the small habits I had built up before. My blood sugar seems more stable now and I don't "crave" sweet stuff like I did before. If I do, I'll have some frozen fruits and plain yogurt with some peanut butter powder for added protein.
I'm learning all this by tracking my calories and only eating what I burn each day.