No, I mean, literally "where did you even read that?" or is it just something you assumed to be true - i.e. you made it up?
I have followed health and fitness sites, nutrition sites and discussions by scientists and doctors for the better part of the last couple decades in response to my own medical issues that doctors could not help with. As I state in my profile I do not provide links. If a topic is interesting to you then I would suggest researching it so that you can decide for yourself which sources are bribed and which are legit. All of the information is well within reach. nih.gov, healthline, even youtube have a handful of decent scientists and doctors to follow. If you are suggesting I am not telling the truth then it is not possible for us to have a good faith discussion on this topic.
Look, you made a comment that’s specific to “American pasta” that seems to lack a factual foundation. I’m not saying you’re lying, I’m just saying you’re wrong and that it seems like you over generalized.
A: I think X.
B: Interesting, why do you think that?
A: I have 10 years of thinking about it.
B: I have 10 years of thinking about it and have the opposite opinion.
A: If you're suggesting I'm not telling the truth then it's not possible for us to have a good faith discussion on this topic.
I might've made a fallacy, but this is what popped to mind when I read this comment.