About men who like to date BBWs

Is it because you're truly attracted to big women, or because you're insecure that a fit woman wouldn't want to be with you? 🤔

I'm watching My 600 lb Life and the husband of the 600 lb woman just said he isn't excited about her losing weight because he is afraid that once she's no longer big, she will leave him. It makes me wonder if that is a common thing in men who date big women.