These common plant proteins may help lower hypertension risk: Are your patients getting enough?
Industry Buzz
Putting more emphasis on plant-based protein sources like legumes and soy in the diet is a low-cost and sustainable alternative that could reduce the burden of hypertension, and potentially the risk of hypertension-related diseases.
—Dagfinn Aune, PhD, MS, via BBC Science Focus
Cardiologists have long emphasized sodium reduction, weight management, and exercise to control blood pressure. Now, a new pooled analysis suggests that higher intake of legumes and soy foods may also play a meaningful role in reducing the risk of hypertension—potentially adding another evidence-based dietary lever for cardiovascular prevention.[]
The study, published in BMJ Nutrition, Prevention & Health, reviewed 12 prospective studies involving populations from the United States, Europe, and Asia.[]
Investigators found that individuals with the highest intake of legumes and soy foods had a significantly lower risk of developing hypertension compared with those consuming the least. Specifically, the highest vs lowest intake of legumes and soy was associated with a 16% and 19% reduction, respectively, in hypertension risk.[]
The findings may resonate with clinicians focused on food-based cardiometabolic interventions.
While legumes and soy have previously been linked to lower cardiovascular disease risk overall, data surrounding their direct effects on blood pressure have been inconsistent. This meta-analysis attempts to quantify that relationship more clearly.[]
Dose-response data may matter clinically
One of the more practice-relevant findings was the apparent dose-response relationship. Researchers identified a potential “sweet spot” of approximately 170 g/day of legumes and 60–80 g/day of soy foods for maximal blood pressure benefit.[]
For cardiologists counseling patients with elevated blood pressure or metabolic syndrome, these targets may help translate broad dietary advice into practical recommendations. Examples of legumes included lentils, chickpeas, peas, and beans, while soy sources included tofu, soy milk, and tempeh.[][]
“Putting more emphasis on plant-based protein sources like legumes and soy in the diet is a low-cost and sustainable alternative that could reduce the burden of hypertension, and potentially the risk of hypertension-related diseases,” Dagfinn Aune, PhD, MS, one of the study’s authors, told BBC Science Focus.[]
Mechanistically, the benefits are biologically plausible.
Legumes are rich in potassium, magnesium, fiber, and plant protein—all nutrients associated with vascular health and improved blood pressure regulation. Soy foods additionally contain isoflavones, which may support endothelial function and nitric oxide–mediated vasodilation.[][]
Important caveats remain
Despite the encouraging findings, the authors caution that the evidence remains observational and cannot establish causality. Dietary assessment methods differed across studies, and residual confounding is possible. Patients with higher legume and soy intake may also engage in other heart-healthy behaviors that contribute to a lower risk of hypertension.[][]
Additionally, researchers noted uncertainty regarding the apparent plateau effect for soy intake beyond 60–80 g/day. Whether this reflects a true physiologic threshold or simply limited available data remains unclear.[]
Still, for cardiovascular specialists navigating an era of rising hypertension prevalence and growing interest in lifestyle medicine, the analysis adds momentum to dietary strategies centered on minimally processed plant foods.[]
While unlikely to replace pharmacotherapy in higher-risk patients, increased legume and soy intake could become part of a more structured preventive cardiology toolkit, particularly for patients with stage 1 hypertension, obesity, or cardiometabolic risk factors.[]