In a way, it does all boil down to how much you eat for the purposes of maintaining weight (or losing/gaining for that matter).
As much as people want to argue over it, if a person stops eating, they will get thin, languish and eventually die. So how much food you take in clearly has a controllable effect.
If you come from a place of being extremely overweight (like me and many others), I know exactly how I got there. Food matters - it absolutely HAS to, and it’s the most controllable variable you have with weight control. Whether you want to obscure it with calorie measurements, hormonal response, whatever - at the end of the day, if your goal is to lose, gain or maintain, it will all eventually hinge on how much you take in.
Whenever I hear arguments for or against “CICO”, I usually have to stop those people i’m arguing with and first clarify what they consider “CICO” to be. To some, it means the actual act of calorie counting, while not taking macronutrients into account (level playing field, a calorie is a calorie, yadda yadda). To others, when they say “It’s all CICO anyway”, they USUALLY mean “Hey, I don’t care how you eat, it’s still possible to eat too much.”
I get kind of annoyed at the lack of sanity on this topic. I get REALLY annoyed when “Keto” gets branded as this “eat as much bacon as you want, and still lose weight” fad. Yet to this day, I still have an acquaintance or two who have no problem looking me straight in the face and tell me that they fasted for 5 days straight and gained 2 pounds without drinking crazy fluids.
I mean, does anyone believe that?