Despite collating more event data than previous systematic reviews of randomised controlled trials (665 deaths in some 6,250 participants), there is still insufficient power to exclude clinically important effects of reduced dietary salt on mortality or cardiovascular morbidity in normotensive or hypertensive populations.
Further RCT evidence is needed to confirm whether restriction of sodium is harmful for people with heart failure.
Our estimates of benefits from dietary salt restriction are consistent with the predicted small effects on clinical events attributable to the small blood pressure reduction achieved.
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https://www.ncbi.nlm.nih.gov/pubmed/21735439
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