Yeah, unfortunately this kinda only goes one way. No matter your metabolism, if you starve yourself you will lose weight. It's literally physically impossible for you to not. It's just difficult and wildly unhealthy to lose weight that way.

Whereas the opposite is not neccassarily true, depending on your metabolism you very well might be able to eat as nuch as you want. You might even have to eat more than you are comfortable with just to maintain your weight, which is what I deal with. With the right metabolism, there could be a situation where there is no upper limit on how much you could eat without gaining weight.

Caveats include: obviously if you eat a pound of food your weight goes up by a pound, but assuming you are similar to me, after that passes through you your weight goes back down to effectively the exact same as it was before you ate. Im not glorifying a fast metabolism here, in fact my metabolism is no fast that I don't get most of the nutients i eat and am therefore perpetually malnourished no matter what or how much I eat. I spend more on food to maintain my weight than i do on literally everything else combined, excluding rent, and maybe gas.

Oddly, although scaling my food does not seem to scale nutrients from my food, scaling my caloric burn does seem to impact my appetite. When I was working a physical job, i was consuming about 4000 calories/day and most of the time i felt like I was on the edge of passing out from never ending fatigue. I'd wake up and spend every moment of the day starving. Now, i work a very relaxed job and my appetite has vanished. I often go days without eating and dont seem to be losing a significant amount of weight, unlike back when. Although when I do eat I tend to eat multiple huge meals in a day, often about once/twice a week, and my weight afterwards doesnt seem to go up, it just stops going down for a day or two. The only way for me to gain weight seems to be to lose it first, I literally cannot get above 160lb at 6"2'