What 300,000 People’s Diets Reveal About Preventing High Blood Pressure
A bowl of lentil soup or a block of tofu may benefit cardiovascular health, according to a new analysis tying legumes and soy to a lower risk of high blood pressure. The research pulled data from more than 300,000 people across multiple countries, and the pattern held: eating more beans, lentils, chickpeas, and soy foods like tofu was linked to a lower risk of developing hypertension, one of the leading causes of heart attacks and strokes worldwide.
Timing matters here. High blood pressure affects an estimated 1.4 billion people globally, and the total number of cases more than doubled between 1990 and 2019, rising from 648 million to over 1.28 billion. Its burden is particularly high in low- and middle-income countries, adding to existing health inequalities, which makes affordable, food-based strategies worth paying attention to. The new findings, published in BMJ Nutrition, Prevention & Health, add fresh weight to that case.
Legume Eaters Showed a 16% Lower Hypertension Risk
A research team pooled results from 12 long-term studies that tracked people’s eating habits and health outcomes over time, a method that captures patterns individual studies often miss. For the legume analysis, 10 cohorts included 309,853 participants and 86,098 cases of high blood pressure. Seven cohorts made up the soy analysis, with 278,200 participants and 93,934 cases.
Studies came from several regions: five from the United States, five from Asia, including China, Iran, South Korea, and Japan, and two from Europe. Individual study sizes ranged from 1,152 to 88,475 participants, giving the analysis a broad evidence base.
People who ate the most legumes, meaning beans, lentils, chickpeas, and peas, had a 16% lower risk of developing high blood pressure than those who ate the least. The result barely budged even when researchers dropped individual studies from the analysis one at a time to check whether a single large study was skewing things.
Soy Intake Showed an Even Stronger 19% Lower Risk
For soy foods, the association was stronger. People who consumed the most soy had a 19% lower risk compared to the lowest consumers. The researchers noted this is the first analysis of its kind to specifically examine the link between soy food intake and high blood pressure risk.
Researchers also looked at whether more food meant more benefit. For legumes, risk continued to fall across the range studied, up to about 170 grams per day, with no sign that the benefit tapered off. For soy, most of the apparent benefit occurred by about 60 to 80 grams per day, with little further reduction at higher intakes.
Potassium, Fiber, and Isoflavones May Explain the Effect
Legumes are rich in potassium and magnesium, two minerals that other research has linked to lower blood pressure. They also contain plenty of fiber and plant-based protein. More recent work cited in the paper suggests that when the gut breaks down certain fibers found in legumes and soy, it produces compounds that help blood vessels relax and widen, which brings blood pressure down.
Soy gets additional attention for its naturally occurring plant compounds called isoflavones, which have shown blood pressure-lowering effects in multiple controlled studies. There’s also a possible indirect route: other research cited in the paper ties legume and soy intake to a lower risk of obesity, itself a major driver of high blood pressure.
Source : https://studyfinds.com/legumes-soy-lower-blood-pressure/