What people have you met who can't gain weight no matter how much they eat?

Tell me about my husband's mom, less than ninety pounds and thinner than a lightning bolt. Everyone who knows her thinks she's naturally skinny. In fact, the family knows very well that she really eats very, very, very... Less. Strictly controlled diet. Started packing on the pounds (meals) in one fell swoop after starting square dancing years ago. Dropped from a hundred and ten pounds straight down to the eighties. If young people are simply upwardly mobile youth. But because hubby and her mom didn't start losing significant weight until they were in their fifties, and the side effects weren't small, now it's just an old face that can't be looked at. A little off topic. What I want to say is that there is no such thing as a demon who can't eat fat. It's all relative. Skinny people definitely have their reasons for being skinny. And most thin people like to create the myth that they were born thin, will not tell you her secret. Fat people if you really believe in the evil of thin people, deserve you fat.