Depending on what you’re talking about, that type of advertising might not be allowed, either. You can’t just spam pics and videos (or posts or chat) with ads for offsite commercial content without approval of the site management.

Please report those stories. That’s not allowed.

I just asked it the same question and to cite sources, and it gave a much clearer answer than the OP received, citing national data for BMI >40 (with sources, just like you said) and a 2010 study on NIH’s website (that relied on self reporting) that did categorize BMI >50, which is where that less than 1% figure might have HR have come from. ChatGPT admitted that the data is unreliable because of sample size and self reporting. All in all, more useful than an open query. I always ask for links when I’m using it like a search engine. You can see the context of the response.

Chat gpt will give its sources if you ask sometimes. It might not be hallucinated, it also might not be accurate. Although I don’t know how reliable CDC/NIH data is going forward, either. Might be an issue by issue thing.