Comment by nu11ptr

Correct, temporary diets don't work. You have to change your lifestyle/diet permanently. This means after weight loss, you need to adhere to your new caloric intake baseline, which will be _lower_ than when you started. The more you lost, the lower it will be. This is hard, but not impossible to do. I can't speak for the obese because I was never there, but I was solidly overweight and proceeded to dump 40 lbs a decade ago, and never gained it back. Had I gone back to my pre loss diet it would have all come back.

NOTE: Before someone points it out, this is NOT incompatible with my parent comment. Going on a 500 cal/day cut and losing say 8 lbs will not lower your caloric baseline all that much, so temporary more or less works fine. If you use the same method to dump 40 lbs, you will need to readjust your baseline when done or you absolutely will gain it back as your caloric intake needs have been meaningfully reduced.