Previous discussion (I already linked to the study): <a href="https://news.ycombinator.com/item?id=15124906" rel="nofollow">https://news.ycombinator.com/item?id=15124906</a>
Confounding factor: Carbohydrate intake is associated with poverty (because they are generally cheaper).<p>If anyone has access to the full paper, does it account for this?