While your are correct in a fundamental physics way, you might be ignoring the details of human chemistry and its resulting psychology impact. There's are reasons for the relatively recent obesity epidemic. Those reasons are rooted in the misguided dietary recommendations to reduce fat in favor of increasing carbs.
You say that as though exercising like a competitive athlete is necessary for good health or weight maintenance. It isn't. It's much simpler to understand the insulin cycle and work with it rather than against it.
https://www.thebairs.net/2015/05/recommended-reading-why-we-...