The Study
Effect of changes in potassium intake on blood pressure: a dose–response meta-analysis of randomized clinical trials (2000–2024)
This study looked at many small experiments where people took potassium pills and found that, on average, people with high blood pressure had a little lower blood pressure afterward. But we can't say for sure the pills caused it because not all the experiments were perfectly done.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
Eating more potassium-rich foods like bananas and spinach can help lower high blood pressure, but doesn't do much if your blood pressure is already normal.
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 555 / 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 — a 5.3 mmHg drop in systolic pressure is clinically meaningful and can reduce stroke and heart disease risk.
- 2With 50 mmol/day more potassium: blood pressure drops 5.3 mmHg systolic and 3.62 mmHg diastolic in people with high blood pressure; drops only 0.5 mmHg systolic and 0.12 mmHg diastolic in people with normal blood pressure.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Clinical Kidney Journal
Year
2025
Authors
M. Granal, V. Sourd, M. Burnier, J.-P. Fauvel, Arthur Gougeon
Related Content
Claims (6)
Eating more potassium-rich foods like bananas and spinach can help lower your blood pressure and make it less likely you'll have a stroke or heart problem—especially if you're eating a lot of salty foods.
If you eat more potassium every day—like from bananas or potatoes—your blood pressure might drop just a tiny bit, but not enough to matter for your health if you don’t already have high blood pressure.
Most of the studies that looked at whether potassium lowers blood pressure aren’t very reliable—many didn’t properly hide who got the potassium or only reported the results they liked.
If adults with high blood pressure eat more potassium-rich foods—like bananas or spinach—by about 50 mmol per day, their blood pressure numbers go down a bit, which might help lower their risk of heart problems.
If you have high blood pressure, eating more potassium might lower it more than it does for someone with normal blood pressure.
If you eat more potassium-rich foods, your blood pressure goes down in a straight-line way—more potassium means lower blood pressure, and this keeps happening all the way up to a pretty high amount, at least for people with high blood pressure.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.