Daily Nut Consumption Linked to Significantly Lower High Blood Pressure Risk, Study Finds
A comprehensive review of eight studies suggests that eating about 30 grams of nuts daily could reduce the risk of developing hypertension.
Eating a handful of nuts each day may significantly reduce the risk of developing high blood pressure, according to a major review of multiple studies. The findings, published in the British Journal of Nutrition, analyzed data from nearly 150,000 individuals.
The review, which synthesized results from eight long-term studies involving 143,380 participants, found that those who consumed approximately 30 grams (about 1 ounce) of nuts daily had a 26 percent lower risk of being diagnosed with high blood pressure compared to individuals who did not eat nuts. For every additional 28 grams of nuts consumed daily, the risk of developing high blood pressure decreased by 20 percent.
The highest levels of nut consumption in the studies were associated with a 16 percent lower risk of high blood pressure. Researchers noted that the blood pressure-lowering benefits appeared to plateau, with no additional advantage observed from consuming more than 35 grams of nuts per day. Conversely, benefits seemed to diminish for those eating 25 grams or less daily.
The studies included participants aged 18 to 87 from various countries, including the United States, France, Spain, South Korea, China, and Iran. While the specific types of nuts were not detailed in all studies, previous research indicates that almonds, cashews, walnuts, and peanuts are among those linked to a lower risk of hypertension.
While the review did not investigate whether nuts can lower blood pressure in individuals already diagnosed with hypertension, experts suggest that a healthy diet, regular exercise, and maintaining a healthy weight are crucial for managing blood pressure. Nuts are a component of established heart-healthy diets such as the Mediterranean diet and the DASH (Dietary Approaches to Stop Hypertension) diet.
Several biological mechanisms may explain the observed benefits. Nuts are a source of L-arginine, an amino acid the body uses to produce nitric oxide, which helps blood vessels relax and widen. The fiber content in nuts can be metabolized by gut bacteria into compounds associated with lower blood pressure. Additionally, the antioxidants found in nuts may help reduce inflammation, a factor that can elevate blood pressure. Nuts are also rich in magnesium and potassium, minerals known to support vascular health.
The study’s observational nature means it cannot definitively prove causation. However, the researchers found no evidence of bias, although they noted the limitation of a relatively small number of included studies. They also did not specify whether the nuts consumed were salted, and high salt intake is a known risk factor for high blood pressure.
Health professionals recommend opting for unsalted, mixed nuts and suggest incorporating them into the diet as a replacement for less healthy processed snacks like potato chips. The study does not suggest that nuts should replace prescribed medication but rather may serve as a beneficial dietary addition to existing treatments.