Eating around four to six servings of whole grains a day may help improve several risk factors linked with heart disease, including body weight, waist circumference, cholesterol levels and inflammation, according to a major review of clinical trials published in the European Heart Journal.

The findings strengthen a familiar public health message: choosing whole grains more often, especially in place of refined grain foods, could offer meaningful benefits for cardiovascular health.

The review found that an intake of roughly 60 to 100 grams of whole grains daily, measured as dry weight, was associated with the greatest improvements across several measures.

That amount is broadly equal to four to six servings, though serving sizes vary by food. A serving may include a slice of wholemeal bread, a small bowl of porridge, a portion of brown rice, a serving of wholegrain breakfast cereal or a helping of quinoa.

“The analysis found high-certainty evidence that eating whole grains was associated with reductions in body weight, waist circumference, total cholesterol and interleukin-6, known as IL-6. IL-6 is an inflammatory marker”

Heart disease remains a leading cause of illness and death globally. It is influenced by many interconnected factors, including cholesterol, blood pressure, blood sugar, smoking, physical activity, body weight, sleep, family history and dietary pattern. No single food can prevent cardiovascular disease. Yet dietary changes can help improve several modifiable risk factors over time.

The new analysis examined randomised controlled trials involving more than 6,500 participants. These studies are generally regarded as among the most reliable forms of research for testing the health effects of dietary interventions. Researchers assessed how increased wholegrain intake affected measures linked with cardiovascular and metabolic health.

The analysis found high-certainty evidence that eating whole grains was associated with reductions in body weight, waist circumference, total cholesterol and interleukin-6, known as IL-6. IL-6 is an inflammatory marker. Persistent low-grade inflammation has been associated with a greater risk of several chronic illnesses, including cardiovascular disease, although individual test results need to be interpreted in a broader clinical context.

Researchers also reported moderate-certainty evidence for improvements in low-density lipoprotein cholesterol, or LDL cholesterol, triglycerides, systolic blood pressure and fasting blood glucose. LDL cholesterol is commonly referred to as “bad” cholesterol because high levels can contribute to the development of fatty deposits in the arteries. Raised triglycerides, high blood pressure and poorly controlled blood glucose can also increase long-term cardiovascular risk.

The results do not mean that whole grains can replace prescribed medicines or medical treatment. People with high cholesterol, diabetes, hypertension or established cardiovascular disease should continue to follow the advice of their healthcare professionals.

Whole grains can be one useful part of a wider approach that may also include medication, regular exercise, smoking cessation, adequate sleep and management of stress.

Whole grains retain all three parts of the original grain kernel: the outer bran, the germ and the starchy endosperm. The bran is rich in fibre. The germ contains nutrients and naturally occurring plant compounds. The endosperm provides carbohydrate and some protein. Keeping these components intact means whole grains tend to provide more fibre and a broader range of naturally occurring nutrients than refined grains.

Common examples of whole grains include oats, brown rice, wholewheat, barley, rye, bulgur wheat, millet, buckwheat and wholegrain corn. Quinoa is technically a seed rather than a true cereal grain, although it is often included in wholegrain dietary guidance because of its similar nutritional use and profile. Wholemeal bread, wholewheat pasta, wholegrain pitta bread, brown rice, oatcakes and cereals made with buckwheat or spelt can all contribute to daily intake.

Refined grains, on the other hand, are processed to remove the bran and germ, leaving mostly the starchy endosperm. The process creates a smoother texture and can extend shelf life. It also removes much of the grain’s naturally occurring fibre and nutrients. White bread, white rice, standard pasta, many crackers, pastries, cakes and breakfast cereals made from refined flour are common examples. Some refined grain foods are fortified with selected vitamins and minerals, although fortification does not fully restore the fibre or full nutrient profile present in the original whole grain.

This distinction matters. Whole grains can be more filling than refined alternatives because they contain more fibre and often require more chewing. Fibre can support normal bowel function and may help slow the digestion and absorption of carbohydrates. Whole grains may also influence cholesterol metabolism and the gut microbiome, the diverse collection of microorganisms in the digestive system.

The review suggests that the benefits of whole grains may be especially relevant when they replace refined grain foods. Several trials in the analysis involved substituting whole grains for refined grains. This makes it difficult to separate the potential benefits of eating more whole grains from the possible disadvantages of consuming fewer refined products.

For most people, replacement is likely to be a practical strategy.

Adding several servings of whole grains to an already energy-rich diet could increase overall calorie intake. Swapping foods, rather than simply adding them, may make more sense. Choosing porridge instead of a sugary refined cereal, wholemeal bread instead of white bread, or brown rice instead of white rice can raise wholegrain intake without fundamentally changing the structure of meals.

The research authors estimated that the clearest improvements occurred at an intake of about 60 to 100 grams daily. This is towards the upper end of many existing dietary recommendations. Many adults consume much less, often relying heavily on refined bread, rice, pasta and packaged snack foods.

Increasing intake does not have to mean changing everything at once. Starting with one regular meal can be enough. Porridge oats are an accessible breakfast option. Wholemeal or rye bread can be used for sandwiches. Brown rice, barley, bulgur wheat or wholewheat pasta can work well in evening meals. Combining whole grains with vegetables, beans, lean protein and unsaturated fats may create filling meals with a balanced nutritional profile.

People who find the stronger taste or firmer texture of whole grains unfamiliar may prefer gradual changes. Mixing brown and white rice can be a useful transition. Using half wholewheat and half standard pasta at first may also help. Barley can be added to soups or stews. Oats can be used in homemade dishes. Popcorn, prepared with minimal salt and butter, is another wholegrain snack option.

Not every food labelled “wholegrain” is equally nutritious. Some breakfast cereals, snack bars, biscuits and baked goods may contain whole grains while also being high in added sugar, salt or saturated fat. Shoppers can check ingredient lists and nutrition labels.

Foods described as “multigrain”, “wheat” or “made with whole grains” are not necessarily made mostly from whole grains. A product is more likely to be a substantial wholegrain choice when wholemeal flour, whole oats, brown rice or another whole grain is listed near the beginning of the ingredients list.

The clinical review had important limitations. The median length of the studies was eight weeks, making it difficult to determine whether the changes in cholesterol, weight, waist circumference and inflammatory markers would last over months or years. Most trials were designed to measure risk factors rather than major clinical outcomes such as heart attacks, strokes or cardiovascular deaths.

More long-term research is needed. It should examine whether sustained wholegrain intake affects cardiovascular events, how benefits vary across different age groups and health conditions, and whether very high wholegrain intakes provide additional advantages. Relatively few of the studies assessed intake above 140 grams a day, so the effects at higher levels remain uncertain.

Weight and waist size are also influenced by many variables. Total energy intake, physical activity, sleep, medication, stress, illness and hormonal changes all play a part. The findings should not be interpreted as evidence that whole grains alone cause weight loss. They may support weight management, particularly when replacing lower-fibre refined foods, but a person’s overall eating pattern remains decisive.

Individual dietary needs also vary. People with coeliac disease must avoid gluten-containing grains such as wheat, barley and rye. Suitable alternatives may include brown rice, quinoa, buckwheat, millet, wholegrain corn products and certified gluten-free oats. Cross-contamination can be a concern for people with coeliac disease, so products should be specifically labelled gluten-free where necessary.

For people with diabetes, whole grains can be included in a healthy eating pattern, although portion sizes and overall carbohydrate intake remain important. Pairing grains with protein, vegetables and healthy fats may help create more balanced meals. A serving of brown rice with lentils, vegetables and fish will generally offer a different nutritional profile from a large serving of sweetened cereal eaten alone.

Affordability and convenience can shape food choices. Fortunately, many wholegrain foods are inexpensive and versatile. Oats, brown rice, wholemeal flour, barley and wholewheat pasta are widely available. Frozen or microwaveable grain pouches can save time, though labels should be checked for added salt, sugar and rich sauces. Tinned grain-and-pulse mixtures may also be useful, provided they are rinsed or selected with lower salt content.

The findings support existing guidance rather than signalling a radical shift in nutritional advice. Dietary recommendations in many countries already encourage people to make at least half of their grain intake wholegrain. This analysis gives a clearer indication of the amount that may be associated with measurable improvements in cardiovascular risk markers.

The wider message is not to count every gram or treat one food group as a cure-all. A heart-supportive diet includes plenty of vegetables and fruit, pulses, nuts, seeds, fish or other suitable protein sources, and unsaturated fats. It also limits highly processed foods rich in salt, added sugars and saturated fats.

Still, whole grains offer a realistic place to begin. A bowl of oats at breakfast. Wholemeal bread at lunch. Barley, brown rice or wholewheat pasta at dinner. These are modest changes, though they can add up.

The review suggests that consistently eating about four to six servings of whole grains daily may improve several factors tied to cardiovascular health. The strongest benefits appear to come when whole grains displace refined alternatives. More long-term studies are needed, but the current evidence offers a practical conclusion: making whole grains a regular part of everyday meals is a sensible, accessible step towards better heart health.