We live in a world where hundreds of companies & corporations (and thousands of individuals) make all manner of false claims. When it comes to matters of health, we find it best to be skeptical and 'ask for evidence' before we believe those claims...especially when it's what we want we want to hear & believe. Yeah, we ruffle a few feathers here & there, but there's no harm done...to anyone except those making false claims.
We just wanted to know who "Sarah" was, and whether she was qualified to back up such a claim. That's a valid concern.