Not to be _too_ rude here, but clearly you missed the mark on at least one of those things. If you're burning more energy than you're consuming, it's impossible to not lose weight. Maybe you underestimated how many calories you were consuming, overestimated how many calories you were burning, didn't do it often enough, didn't do it for a long enough period of time, had a few too many "cheat days", or some combination thereof.
Play the weight-loss game with your body, and you'll find the goalposts get moved.
Presumably the point at which it's VERY difficult to expend more calories than you're consuming is something of an equilibrium point, or healthy weight. I find it hard to believe that if you're still 100 pounds overweight after having lost say 20 pounds that it's nigh-impossible to find more "fat to trim" in the caloric intake, for example.
It’s effectively pseudoscience in the context of these discussions.
The simple fact you use less calories to move less mass is far more of a consequential variable many people forget to account for.
Go for a walk wearing a 100lb weighted vest and the try it without one and the impact will be exceedingly clear.
Obesity is absolutely a behavioral problem.
No.
> Obesity is absolutely a behavioral problem.
Nope.
Then circumstances changed. I swapped to an overnight job for more money. I started cooking less because of the hours, and eating more fast food. I stopped lifting weights because powerlifting was less interesting to me. My weight crept up little by little for years and years until I was overweight. And I realized my relationship with food had changed - ignoring physical hunger was still easy, but I was still constantly thinking about food. Slightly bored? Let's eat something. Work stressing me out? Grab some more food. Have a few minutes respite from everything? Eating sounds good. Eventually I was past overweight and into obese.
I managed to lose 30lb or so a few times, close to 50lb once. I could maintain it for a bit. But I was having to expend huge amounts of mental energy to do it - something I had never had to do before I had gotten fat in the first place. The second I had to prioritize other things in my life, for whatever reason, I no longer had the energy to spend so much time trying to push down all of the noise in my mind about food.
vs. just a decade prior, never really thinking about food at all. Is it possible for anyone to lose weight? Sure. Bodies aren't magic. Energy has to come from somewhere, and lower your calories a sufficient amount and you will lose weight. But for many people the amount of willpower and effort required is just massively different. The years of skinny me would not have lasted nearly as long as they did if I had the same level of food noise then that I do now.
It really just comes down to eating less and healthier. Some people have metabolic differences either side, but they don't amount to a great deal.
Weight loss drugs suppressing your appetite literally shows this to be true. You just need to do it yourself without the drug. Eventually you'd want to come off the drug, right? When that happens, you would need to do just this.
Every time I've heard somebody say they've tried everything, they usually haven't. It's not a failing, it's an opportunity to keep trying and get it right.
You're significantly underestimating how difficult doing the right things consitently is.
I've made enough changes to my lifestyle that I am confident I could come off the drug and maintain the lost weight. I've added weight lifting with the prospect of bodybuilding as a hobby. I'm likely going to need to take time off just to get enough calories in during periods when I am trying to add muscle because I won't want to eat enough otherwise.
But I'm not actually looking forward to that, because the list of positive effects from these medications that are independent of weight loss is quite long. I expect that short of any major detrimental side effect suddenly rearing it's head or gene editing or some other superior thing appearing, I'll be on these for life, regardless of weight.