This post shows one thing that always muddies the water of our debate: hearsay; your sister-in-law's doctor "says." But, until we get the quote from page 272 (in its context) we still have only hearsay, and the scaring emails will repeat it ad nauseum and millions will believe it.
The best sequence would be: your sister-in-law says that her doctor says that . . . so, YOU find page 272 and quote it, in its context. That way, we have at least a chance of true understanding, and the argument moves up a notch. [By the way, this is just my reaction to your post; I too, now, have to go find p.272 and discover the truth. I plan to do so.]