A comprehensive review of clinical trials suggests that consuming four to six servings of wholegrain foods daily can substantially reduce the risk of heart attack or stroke. This dietary approach has been shown to lower body weight, cholesterol levels, blood sugar, and blood pressure, contributing to better cardiovascular health.
The amount corresponds roughly to enjoying a bowl of oatmeal, a sandwich made with wholegrain bread, and a portion of brown rice each day. The findings, published in the European Heart Journal, emerged from an analysis of 87 clinical trials investigating the effects of wholegrain consumption on cardiovascular risk factors.
Researchers found that a diet rich in wholegrains-such as brown rice, oats, whole wheat, barley, rye, quinoa, millet, and corn, along with wholemeal bread, pasta, and cereals-helps prevent heart disease by addressing key health markers. The study involved over 6,500 participants from trials conducted in regions including Europe, the United States, Canada, Asia, Australia, and Brazil.
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The analysis revealed that increased wholegrain intake led to reductions in body weight, waist circumference, and blood pressure. It also lowered total cholesterol and low-density lipoprotein (LDL) cholesterol-often referred to as “bad” cholesterol. Additionally, blood levels of triglycerides, glucose, and interleukin-6 (IL-6), which indicates inflammation, were decreased.
Benefits were observed at intakes of 30 to 40 grams per day; however, the most notable improvements occurred with 60 to 100 grams per day, equating to four to six servings.
Dr Helda Tutunchi of Tabriz University of Medical Sciences, Iran, who led the study, commented: “This is the largest and most comprehensive meta-analysis of randomised controlled trials on wholegrain intake and cardiovascular risk factors to date. We specifically evaluated how much wholegrain people need to consume to achieve the greatest health benefits.
“While previous studies offered mixed results, our combined analysis provides high-certainty evidence for improvements in measures such as body weight, waist circumference, and total cholesterol. Nonetheless, many trials were of short duration, averaging around eight weeks, so longer-term effects remain to be confirmed. Additionally, evidence on very high wholegrain intake (above 140 grams per day) is limited.
“Increasing wholegrain consumption is a straightforward, affordable lifestyle change that can complement medical treatments and other health measures. Most benefits occur at intakes near the upper end of current dietary recommendations, supporting public health efforts to encourage higher wholegrain consumption.”
Dr Tutunchi added that wholegrains may improve cardiovascular health through modest improvements across various risk factors simultaneously, rather than a major change in a single factor. This multi-faceted effect could lead to a more significant long-term reduction in cardiovascular risk, although the trials did not directly assess cardiovascular events.
In an accompanying editorial, Dr Cecilie Kyrø of the Danish Cancer Institute remarked: “Clinicians can confidently recommend that patients replace refined grains with minimally processed wholegrains to achieve modest but meaningful health improvements. Such changes could be especially beneficial for individuals with type 2 diabetes.
“At the population level, even small improvements in risk markers can lead to substantial declines in cardiometabolic events. Moreover, evidence indicates that wholegrain foods offer health benefits extending beyond cardiometabolic disease.
“Current guidelines, such as those in the US recommending two to four servings of wholegrains daily, mark progress; however, this analysis suggests that higher intakes may offer optimal cardiometabolic health benefits.”
Dr Kyrø emphasised the importance of policy measures to ensure that minimally processed wholegrain staples remain accessible, affordable, and culturally acceptable, while cautioning against the shift towards ultra-processed products that merely include wholegrains as an ingredient without providing true health advantages.