Why do we think we know what we know? A metaknowledge analysis of the salt controversy

Background: Although several public health organizations have recommended population-wide reduction in salt intake, the evidence on the population benefits remains unclear. We conducted a metaknowledge analysis of the literature on salt intake and health outcomes. Methods: We identified reports—primary studies, systematic reviews, guidelines and comments, letters or reviews—addressing the effect of sodium intake on cerebro-cardiovascular disease...