Get the brief

The Evidence

Page 14

Plant-based diets and blood pressure

Plant-based eating lowers blood pressure by a few millimetres of mercury, small for one person but the kind of shift that moves population risk.

Vegan Brief Evidence last reviewed July 9, 2026

This is a summary of the cited evidence, not medical advice.

  • Controlled trials -4.8 mm Hg systolic
  • Observational -6.9 mm Hg systolic
  • Evidence Meta-analysis, JAMA Intern Med

The short version

The strongest single read on plant-based eating and blood pressure is a 2014 JAMA Internal Medicine meta-analysis that pooled 7 controlled trials and 32 observational studies. Because it includes randomized trials, it can speak to cause rather than correlation alone, and in those trials the drop in systolic pressure was small but clear.

Primary source 01 / 05

In the 7 controlled trials (a total of 311 participants; mean age, 44.5 years), consumption of vegetarian diets was associated with a reduction in mean systolic BP (-4.8 mm Hg; 95% CI, -6.6 to -3.1) ... and diastolic BP (-2.2 mm Hg; 95% CI, -3.5 to -1.0)

Yokoyama and colleagues National Cerebral and Cardiovascular Center Meta-analysis, JAMA Internal Medicine, 2014

The observational studies, which watch people eating as they normally do rather than assigning a diet, showed a larger gap. Observational numbers run bigger because the people who already eat this way differ in other ways too.

Primary source 02 / 05

In the 32 observational studies (a total of 21,604 participants; mean age, 46.6 years), consumption of vegetarian diets was associated with lower mean systolic BP (-6.9 mm Hg ... and diastolic BP (-4.7 mm Hg

Yokoyama and colleagues National Cerebral and Cardiovascular Center Meta-analysis, JAMA Internal Medicine, 2014

The authors' bottom line was measured, and they framed the diet as a tool rather than a cure.

Primary source 03 / 05

Consumption of vegetarian diets is associated with lower BP. Such diets could be a useful nonpharmacologic means for reducing BP.

Yokoyama and colleagues National Cerebral and Cardiovascular Center Meta-analysis, JAMA Internal Medicine, 2014

A large cohort agrees

Adventist Health Study-2 checked the same question in a 500-person clinical sub-study and found vegetarians, and vegans especially, sitting lower, while being honest that some of the effect traces to body weight rather than diet directly.

Primary source 04 / 05

vegetarians, especially vegans, with otherwise diverse characteristics but stable diets, do have lower systolic and diastolic BP and less hypertension than omnivores. This is only partly due to their lower body mass.

Pettersen and colleagues Loma Linda University Adventist Health Study-2, Public Health Nutrition, 2012

How big is a few mm Hg?

For one person, a 5 mm Hg drop is modest. Across a population it is not: shifts of that size move the rates of stroke and heart disease measurably, which is why the effect matters even though the per-person number looks small. The Academy of Nutrition and Dietetics puts the observational gap in the same range.

Primary source 05 / 05

those who follow a vegetarian diet have systolic blood pressure about 7 mm Hg lower and diastolic blood pressure 5 mm Hg lower than study participants who consume an omnivorous diet.

Academy of Nutrition and Dietetics Position paper Position of the Academy of Nutrition and Dietetics: Vegetarian Diets, 2016

The grade here is solid. Randomized trials back a real causal effect, cohorts and a large meta-analysis agree on the direction, and the honest caveat is only about size and mechanism: the drop is modest and partly mediated by weight, not a substitute for medication where it is needed.

  • Plant-based diets and heart disease The heart-disease evidence is genuinely good for plant-based eating, and honest reporting includes the one finding that cut the other way: stroke.
  • Plant-based diets and type 2 diabetes Vegetarians and vegans get type 2 diabetes far less often, and a vegan diet helps manage it, though the trial effect on blood sugar is real and modest, not a cure.
  • Plant-based diets and longevity One large cohort found vegetarians die at lower rates; another found no difference. The honest answer on longevity is that the evidence is split.
  • Plant-based diets, gout and kidney stones For gout and kidney stones, cutting meat is one of the cleaner wins in nutrition. Vegetarians formed about a third fewer stones, and plant purines never earned their bad reputation.
  • Potassium on a vegan diet Potassium is the mineral the modern diet is short on, and plant-based eating is where it is easiest to get. Fruit, vegetables, beans and potatoes are all loaded with it.
  • Plant-based diets and cholesterol If a diet has one signature effect on the blood, for plant-based eating it is cholesterol. Low saturated fat plus high fibre pushes LDL down, and the trials back it up.

Frequently asked

Does a plant-based diet lower blood pressure?

Yes. A JAMA Internal Medicine meta-analysis found vegetarian diets lowered systolic blood pressure by about 4.8 mm Hg in controlled trials and 6.9 mm Hg across observational studies. The effect is modest but consistent.

Is the blood-pressure benefit just from losing weight?

Partly. Adventist Health Study-2 found vegetarians and vegans had lower blood pressure and less hypertension than omnivores, and said this is only partly due to their lower body mass, so diet appears to contribute beyond weight alone.

The primary sources

The documents this page quotes. Read them yourself.

Evidence first, every morning.

The standard behind these pages, applied to each day’s news: the study quoted and graded before the headline reaches you. One short brief, free.

Free, every morning. No guilt. No preaching.