there could be a huge difference between two people who are 5’10” weighing 220: one could be sloppy fat and the other ripped with muscle. This is ridiculous.
I can gain 40 lbs before I become obese. I look around....I don't see a lot of people that are 40 pounds overweight. And when I do, I also see too much beer, too much food and too much soda.
I weighed more (113) when I was young but had more muscle. At 67, that's the way it is with "normal" exercise.