This is kinda gross, but I think relevant. I had a friend stay with me for about a month. He's super country, but in the South Georgia and not Texan sense, meaning he constantly eats shit all day. I know this because we worked together. (He's still skinny but only 22 years old. And, shocker, his dad is very overweight and type 2 diabetic.) I'm talking Doritos, Cheetos, those super sugary granola bars, Lunchables, Mountain Dew after Mountain Dew, gas station hot dogs, etc. every goddamn day. Well, he's gone now and I went to clean the bathroom he was using. JESUS CHRIST. That toilet looked like someone with some severe chronic intestinal illness used it. Splatters of shit everywhere. Undoubtedly he'll be fat later in life. So you're right. I don't think fats know what it's like to be healthy because that has become to new "normal" to them, feeling like shit all the time.