Counting calories. I finally lost 50 lbs and learned that when I’d go to the gym or go for a run, I’d compensate by eating more, which is why I never lost the weight I wanted in 20 years of regular exercise.
I still exercise, but now I do it to 1- get stronger, and 2- earn calorie budget so I can eat more.
Counting calories really has helped me. I lost almost 15Kg, I'm on the verge of being only overweight, I feel lighter, I snore less, ...
After the period of adaptation it has also make me relate to the food in diferent ways, feeling full sooner, and my taste has changed somewhat and I don't love "unhealthy" food any longer.
This with daily weight-ins (with average indicator) has been the real game changer for me.
I read about this on Hacker's diet[0], and I didn't start counting until february. If I had known it would be to simple (not that easy though) I might have started sooner.
I still exercise, but now I do it to 1- get stronger, and 2- earn calorie budget so I can eat more.