Eating beans and soy products may be linked to lower hypertension risk

People who consume more beans, lentils and soy-based foods seem less likely to develop high blood pressure. A review of long-term research found a lower risk among those with the highest intake.

The results add common foods such as chickpeas and tofu to the conversation about preventing hypertension. They relate to the likelihood of developing the condition, rather than showing that any one food can treat an existing diagnosis.

The analysis, published in BMJ Nutrition, Prevention & Health, combined 12 studies that tracked people over time. Researchers compared dietary habits with later cases of high blood pressure across several countries.

Legumes include beans, peas, lentils and chickpeas. Soy is technically a legume too, but the researchers examined soy foods separately because they are consumed in many forms, including tofu, soy milk and edamame.

When the highest and lowest intake groups were compared, greater legume consumption was linked with a 16% lower risk of hypertension. Higher soy intake was associated with a 19% lower risk.

Those are relative differences between groups, not percentage-point reductions for each person. The chance of developing high blood pressure also depends on age, overall health, diet and many other factors.

For practical ideas on changing everyday meals, see research into food swaps that could improve diet and reduce costs.

The legume analysis covered more than 309,000 participants, while the soy analysis included more than 278,000. These groups overlap across the evidence base, so the numbers should not be treated as separate totals.

The researchers also examined how much people ate. For legumes, the pattern suggested steadily lower risk up to about 170 grams a day; for soy, much of the apparent reduction appeared by roughly 60–80 grams a day.

Those amounts reflect patterns seen in the studies, not a personalised prescription. The research did not randomly assign people to those exact daily servings and then test whether everyone experienced the same benefit.

There are plausible explanations for the association. Legumes provide fibre, plant protein and minerals, and they can replace foods that are higher in saturated fat or salt, depending on how meals are prepared.

At the same time, people who eat more legumes may also differ in other ways. Researchers can adjust for measured differences, but observational studies cannot remove every influence from exercise, smoking, income or the rest of the diet.

The findings also varied from one study to another, especially for soy. Differences in foods, preparation methods and populations make it hard to translate the pooled results into a guaranteed effect for any single meal.

Even with those uncertainties, the analysis adds to evidence that legumes can be part of a healthy eating pattern. Its practical value is that ordinary, widely available foods may help with prevention without the need for an expensive supplement or exotic ingredient.

If you are interested in this topic, please read articles about Eating more plant-based proteins can lower blood pressure, study finds, and How a vegan diet can help manage high blood pressure.

For more information, please see articles about Soy foods may help lower the risks of heart disease and death, and The DASH diet is a simple way to lower high blood pressure.

Source: Plant-Based Health Professionals UK and Imperial College London.