True ... but for where it is a medical problem, they can take their thyroid meidication to help. For the other situations it’s like a nasty family recipe that keeps being handed down by example.
Only a portion of these problems are thyroids. There are other things that have obesity as a side effect.
I know a family that struggles with polycystic ovarian, all the girls are overweight and losing hair. They didn’t even know they had it until I mentioned it to them and they went to the doctor. They thought they were just a “fat family” that couldn’t get it together because their thyroids read normal. Painful for the psyche.