Key result
Increased dietary salt intake was causally related to increased blood pressure and associated with adverse health outcomes, including renal cell cancer, with no harm found from lowering salt intake.
Why the study?
Does increased dietary salt intake increase blood pressure and adverse health outcomes?
Systematic Review (n=186,357)
Does increased dietary salt intake increase blood pressure and adverse health outcomes?
This systematic review reinforces the causal link between high dietary salt intake and increased blood pressure, supporting current public health guidelines for dietary sodium restriction.
Supports sodium restriction guidelines; confirms causality for BP elevation and extends evidence to renal cell cancer risk.
The authors provided a systematic review of the clinical and population health impact of increased dietary salt intake during 1 year. Randomized controlled trials or cohort studies or meta-analyses on the effect of sodium intake were examined from Medline searches between June 2013 to May 2014. Quality indicators were used to select studies that were relevant to clinical and public health. A total of 213 studies were reviewed, of which 11 (n=186,357) were eligible. These studies confirmed a causal relationship between increasing dietary salt and increased blood pressure and an association between several adverse health outcomes and increased dietary salt. A new association between salt intake and renal cell cancer was published. No study that met inclusion criteria found harm from lowering dietary salt. The findings of this systematic review are consistent with previous data relating increased dietary salt to increased blood pressure and adverse health outcomes.
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Johnson et al. (2015) conducted a systematic review in Dietary salt intake (n=186,357). Increased dietary salt intake vs. Lower dietary salt intake was evaluated on Blood pressure and adverse health outcomes. Increased dietary salt intake was causally related to increased blood pressure and associated with adverse health outcomes, including renal cell cancer, with no harm found from lowering salt intake.
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