Four to six servings of whole grains a day may be the sweet spot for protecting your heart.
“Although higher whole-grain intake has long been linked to better heart health in population studies, clinical trials have produced mixed findings,” said lead author Helda Tutunchi from Tabriz University of Medical Sciences in Iran. “This left an important practical question unanswered: How much whole grain should people eat to meaningfully improve cardiovascular health?”
An analysis of 87 clinical trials involving more than 6,500 people found that eating more whole grains improves several major risk factors for cardiovascular disease.
The higher intake reduced body weight, waist size, and blood pressure, according to researchers.
It also lowered both total and LDL — or “bad” — cholesterol, triglycerides, blood sugar and a key marker of inflammation in the blood.
Benefits started to appear at roughly two servings of whole grains a day. But the greatest effects were generally seen at four to six servings — about 60 to 100 grams — a day.
That’s roughly a bowl of oatmeal, a sandwich on whole-grain bread and a serving of brown rice.
“Increasing whole-grain intake is a relatively simple, accessible and affordable dietary strategy that can complement other lifestyle and medical interventions,” Tutunchi said.
One final note from researchers: Oats, brown rice and rye each affected different heart risk factors, suggesting a varied diet may offer the broadest protection.
The study was published Sept. 15 in the European Heart Journal.
RELATED: Heart Health Clinical Trials: A Black Doctor’s Perspective
Heart disease remains one of the leading causes of death among Black adults. Additionally, approximately 60 percent of Black women aged 20 and older live with some form of heart disease. Research shows that Black Americans are more likely to experience risk factors such as high blood pressure, diabetes, and obesity.
Small, yet meaningful dietary improvements can have a large impact on long-term heart health. Eating more whole grains is just one practical step within an overall heart-healthy lifestyle for Black Americans.
Not sure which foods are considered whole grains? Check out the list below:
To double-check if a food is really a whole grain, look for the word “whole” directly preceding the first ingredient, or confirm the label explicitly states “100 whole grain” or “100% whole wheat.”
Here are some simple ways to add more whole grains to your diet:
RELATED: Fall-Inspired Sweet Whole Grain Recipes
Studies like these help researchers better understand how everyday eating habits affect long-term health. Nutrition research can inform future prevention strategies for heart disease and stroke. But for these studies to have a significant impact, they need diverse participation. More diverse participation in health research helps ensure findings benefit all communities.
If you’re interested in contributing to future nutrition studies, ask your healthcare provider or look for opportunities on ClinicalTrials.gov or BlackDoctor’s Clinical Trials Resource Center.
More information
The American Heart Association has more on whole grains.
SOURCE: HealthDay TV, Sept. 17, 2026
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