MDs are among the most poorly informed of Americans when it comes to health, and especially when it comes to nutrition. (They are not bad if you're sick.)
You don't need to theorize. Tens of billions of dollars are at stake.
If true, as the left likes to say, he should be gone by the end of the day. But it is the Daily Mail, and they cite a "source," not Barr or someone else with a name and title.
Self-described progressive and former state govt official is not interested in talking to journalists, but wants to tell the world via Twitter. If "many saw it, and watched," she should be filing suit or a formal complaint not blabbling on Twitter.