Frank
I used to. Never morbidly obese, I maxed at 220 for a person who should be 165 or 170. Was on weight loss efforts 6 or 8 times. The older I got, the less the prior calorie counting coefficient held. At about late 50’s I started into biking, 100 mile events, etc. At peak training I was burning 2000+ calories just on the bike daily. And then it took 10 times as many calories to lose a pound as the last time. Yes, I recorded everything, as I was serious about the bike and the weight was one component. So, the data was good.
So I learned, personally, that how hard it is to lose weight, how many calories out versus in, varies with time, varies with exercise regimen, and surely varies among people. So I became, as a consequence, more aware of this other, broadly held and scientifically informed viewpoint. Even my biking coaches said the 1 calorie in = 1 out was b.s.
I was surprised to see my view change, I have to admit. As a former engineer, the energy balance idea just HAD to be right. Note to self, when something HAS to be right, then that just means it seems obvious, and only merits superficial examination. And superficial examination yields high error rates.