Not necessarily. Some people respond well too intermittent fasting but not everyone. Some people respond to keto but not everyone. And just because you respond doesn't mean it's gonna take you to where you need to be.

I've always been skinny but for some reason I've gained weight recently. Even with keto, intermittent fasting, tirzeptide, and workouts twice a week I have only lost 5 lbs in months. When I was skinny and forgot to eat, I would feel a little crappy but still could function. Now I begin to feel incredibly depressed, I can't sleep nor focus. This solidified it to me that there's a circuit in your brain that controls feeding and if it's out of whack it'll punish you until you eat. Dieting takes months and no one can go that long without sleep. So it's still a practical problem, its just hard to see if your system is well calibrated.