Diets
intermittent fasting decreases systolic and diastolic blood pressure
In plain terms: Does intermittent fasting lower blood pressure?
Part of: 🥗 intermittent fasting
Yes modestly — pooled RCTs show roughly a 4-6 mmHg systolic reduction, but much of it parallels weight loss and effects on diastolic pressure are smaller and less consistent.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
The evidence (11)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Guo 2025 · Int J Obes | meta-analysis | mixed | moderate | Systematic review of IF in overweight/obese adults reported inconsistent antihypertensive effects across protocols and flagged safety/adherence caveats. |
| Huang 2025 · Nutr Hosp | meta-analysis | supports | moderate | Meta-analysis of 16 RCTs (5369 patients with type 2 diabetes) found IF significantly reduced both systolic and diastolic blood pressure versus control. |
| He 2026 · Front Nutr | meta-analysis | supports | moderate | Dose-response SR/MA in women with overweight/obesity found IF significantly reduced both systolic and diastolic blood pressure. |
| (IF SR/MA) 2025 · Sleep Med Rev | meta-analysis | mixed | moderate | SR/MA of 18 RCTs found IF reduced diastolic (but not consistently systolic) blood pressure versus ad libitum eating. ⚠️ correction-on-file (Crossref) - kept, corrigendum not retraction |
| Kibret 2025 · Curr Nutr Rep | meta-analysis | mixed | moderate | Network meta-analysis on IF for CVD risk found inconsistent, modest blood-pressure effects across fasting regimens. |
| Al-Jafar 2021 · J Am Heart Assoc | observational | mixed | moderate | LORANS study plus meta-analysis found Ramadan fasting produced small, inconsistent within-person changes in systolic/diastolic BP. |
| Semnani-Azad 2025 2025 · BMJ | meta-analysis | mixed | high | Network meta-analysis of RCTs found IF improved several cardiometabolic outcomes but blood-pressure benefits were small and largely explained by weight loss versus continuous energy restriction. ⚠️ correction-on-file (Crossref) - kept, corrigendum not retraction |
| Sun 2025 · Sci Rep | meta-analysis | supports | moderate | Network meta-analysis of 21 RCTs found intermittent fasting significantly lowered systolic blood pressure (MD -5.98 mmHg), ranking behind DASH among dietary patterns. |
| Gholampoor 2024 · Nutr Metab Cardiovasc Dis | meta-analysis | supports | moderate | SR/MA of religious/faith-based fasting found reductions in blood pressure among cardiovascular risk factors. |
| Gomez-Perez 2025 · Eur J Prev Cardiol | RCT | tested-null | moderate | 24-hour ambulatory BP sub-analysis of an RCT found no significant BP advantage of time-restricted eating or alternate-day fasting over other hypocaloric diets. |
| Trepanowski JF, et al. (Varady) 2017 · JAMA Intern Med | RCT | tested-null | high | In a 1-year alternate-day-fasting RCT, blood pressure did not differ from daily calorie restriction or control, indicating any BP benefit is not specific to fasting. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.