Not this simple.
Choice isn't binary, it's incredibly complex. There're millions of individual little effects that go into each and every one of your choices. You actually have no idea how much influences you have over your "choices". In fact, almost everything you do in life is completely out of your control - you just do it, it's habit. Is brushing my teeth a choice? Certainly, I do it, but I also don't make that choice ever, it just happens.
Why is it that some can drink every week and be fine, but some can't ever drink because they are alcoholics? Why is it that I am able to eat as much as I want, and I'm not fat?
You could just be lucky enough that you do not have a propensity to overeat. Neither do I. But be humble, have some humility. You and I are privileged. I did nothing to earn this. I eat what I want, when I want. It's merely a coincidence the what and when happens to not harm me.