Oh, there's plenty of idiots who would say that. It's the same idiots who say things like eating a specific color M&M will change your gut microbes and make you fat. You did point out the real key though. Idiots use "that's what I heard" and things like it to give a false appeal to authority. They're not required to back it up since they just heard it somewhere so it goes unchallenged. Eventually those are the things that become urban myths. It's the same as the "friend of a friend" principle.