The Study
Impact of sodium intake on blood pressure, mortality and major cardiovascular events: an umbrella review of systematic reviews and meta-analyses
This study looked at lots of other big studies and found that eating less salt probably helps lower blood pressure and might save a few lives, but it doesn’t prove salt directly causes heart problems — it just shows they’re likely linked.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
This study looked at many past studies to see how salt affects heart health. It found that eating very little or very much salt is bad, but cutting down a bit helps your heart.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 536 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — preventing 9 to 12 deaths per 1000 people is a big benefit for public health, even if stroke risk barely changed.
- 2Cutting salt lowered blood pressure by 2 to 8.7 mmHg.
- 3Salt substitutes prevented 12 deaths per 1000 people from all causes and 9 from heart problems.
- 4Stroke risk dropped by only 1 case per 1000 people.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Critical Reviews in Food Science and Nutrition
Year
2024
Authors
Qiuyu Yang, R. Vernooij, Hongfei Zhu, G. Nesrallah, Chunyang Bai, Qi Wang, Ying Li, Danni Xia, Małgorzata M. Bała, Sylwia Warzecha, Mingyao Sun, Ahmad Jayedi, Sakineh Shab-Bidart, Bei Pan, Jinhui Tian, Kehu Yang, Long Ge, Bradley C. Johnston
Related Content
Claims (5)
Eating too little or too much salt might both be bad for your heart — people who eat way less than 3,000 mg or way more than 6,000 mg of salt a day seem to have a higher chance of heart problems or dying from them.
Eating less salt might help keep your heart healthy and prevent serious heart problems, especially if you're not already at high risk for heart disease.
Using salt substitutes doesn’t really help prevent strokes — out of 1000 people, maybe just one less person will have a stroke over time.
Eating less salt can lower your blood pressure a little bit, and that might help keep your heart healthier and prevent heart problems.
Switching to salt substitutes may help prevent 12 out of every 1000 people from dying from any cause, and 9 out of every 1000 from heart-related problems, over time.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.