I don&#x27;t necessarily want to suggest that when I see &quot;nutritionist&quot; I read &quot;witch doctor&quot;, but if there is any field of science which has made less progress over the centuries, it is nutrition. I am not suggesting that any particular practitioners are ignorant or incompetent (per se), merely that it is a very hard problem to study. Among other issues, there is evidence to suggest that glycemic responses are highly individual[1]. However, this is also an area of political and commercial interest, and there are many actors presenting shall we say &quot;motivated&quot; studies, demanding an exacting scrutiny of any empirical results.<p>In short, not only are the self-reported anecdotes of a person with a bachelors in nutrition not adequate evidence of anything, but even formal studies are suspect. As far as my own opinions go I suspect that I would be inclined to believe what she says, but truths that mesh with one&#x27;s preconceptions demand an even higher standard of evidence. Were I you, I would not be promoting this person&#x27;s work, and I feel it was inappropriate as a response to the parent.<p>[1] <a href="http:&#x2F;&#x2F;www.cell.com&#x2F;abstract&#x2F;S0092-8674(15)01481-6" rel="nofollow">http:&#x2F;&#x2F;www.cell.com&#x2F;abstract&#x2F;S0092-8674(15)01481-6</a>