These days, I spend a lot of time with old people and sometimes while there are gems to learn from them, I have found that they haven't been able to let go of fallacies regarding health issues.
To most of them, if you are thin, you are weak and if you are fat, you are healthy.
They are of the notion that if you exercise and lose weight, you are doing something wrong. If you choose a better diet and eat healthy food, you are doing something sinful.
Their favourite word is, "eat"!
I don't debate with them it because it's pointless.