This study, which received a lot of attention about a year ago, is probably what he's referring to: http://jama.jamanetwork.com/article.aspx?articleid=899663 ht

This study, which received a lot of attention about a year ago, is probably what he's referring to: http://jama.jamanetwork.com/article.aspx?articleid=899663 http://jama.jamanetwork.com/article.aspx?articleid=899663 "The associations between systolic pressure and sodium excretion did not translate into less morbidity or improved survival. On the contrary, low sodium excretion predicted higher cardiovascular mortality."