Effect of longer term modest salt reduction on blood pressure: Cochrane systematic review and meta-analysis of randomised trials

Few dietary debates are as politicized as salt. This Cochrane meta-analysis cuts through it with the cleanest tool available: randomized trials of cutting salt, run for at least a month.

Across 34 trials, a modest, sustained reduction in salt intake lowered both systolic and diastolic blood pressure — in people with and without hypertension alike. The effect is not dramatic per person, but it is real, consistent, and achievable through ordinary dietary change rather than medication.

The practical takeaway scales from the individual to the population: even a small cut in salt, held over time, lowers blood pressure, and across a whole population that translates into meaningfully fewer cardiovascular events. The resistance is industrial and ideological — food manufacturers facing reformulation costs, and a vocal contingent skeptical of population salt guidelines.

We rate the evidence strong: a Cochrane systematic review with rigorous criteria, a large pooled sample, and transparent methods (the authors’ public-health advocacy noted, but no financial conflicts). Its clinical significance is high — salt reduction is a low-cost, scalable lever on blood pressure that reaches billions, with blood-pressure drops that map directly onto lower cardiovascular risk.