Whole Grain Consumption and Cardiometabolic Health

Whole grains, defined by the retention of bran, germ and endosperm, are a foundational component of dietary guidelines worldwide. Epidemiological evidence consistently links higher intake to lower incidence of cardiovascular disease, type 2 diabetes and metabolic syndrome. The protective effects are attributed to dietary fibre, vitamins, minerals and phytochemicals that modulate lipid profiles, glycaemic control and inflammatory pathways. Whole grains also influence gut microbiota composition, leading to production of short-chain fatty acids and other metabolites that support vascular health. Despite broad consensus on benefits, heterogeneity in study designs, whole-grain definitions and intake assessment has challenged efforts to establish optimal consumption levels. Emerging biomarkers facilitate more precise intake quantification and mechanistic understanding, reinforcing the global imperative to promote whole-grain foods as part of integrated cardiometabolic prevention strategies.

Research from Nature Portfolio

Recent analyses employing an agnostic, environment-wide association approach have mapped the relationship between hundreds of dietary factors and coronary heart disease risk. Whole-grain consumption emerged among a limited set of foods and nutrients robustly associated with lower risk of acute myocardial infarction and fatal coronary events, with validation across independent cohorts. A bipartite food–nutrient network highlighted which grain components underlie beneficial associations, providing a systems-level perspective on dietary drivers of heart health.

Mechanistic investigations have identified 5-aminovaleric acid betaine (5-AVAB) as a bioactive metabolite elevated by whole-grain intake. In primary cardiomyocytes, physiologically relevant concentrations of 5-AVAB were shown to inhibit mitochondrial β-oxidation of fatty acids by reducing cellular L-carnitine via transporter modulation. This novel pathway offers insight into how whole-grain–derived metabolites may influence cardiac energy metabolism and warrants further in vivo validation.

Whole Grain Consumption and Cardiometabolic Health publication trend

The graph below shows the total number of articles in whole grain consumption and cardiometabolic health across all publications each year (not limited to Nature Index journals).

Technical terms

Cardiometabolic health: Integrated status of cardiovascular and metabolic systems, encompassing risk factors for heart disease and diabetes.

Metabolomics: Comprehensive analysis of small-molecule metabolites within biological samples to characterise metabolic responses.

β-oxidation: Mitochondrial enzymatic process that breaks down fatty acids into acetyl-CoA for energy production.

Alkylresorcinols: Phenolic lipids concentrated in whole-grain bran, used as biomarkers of whole-grain intake.

5-Aminovaleric acid betaine (5-AVAB): A whole-grain–derived compound that can modulate cardiac fatty acid metabolism.

Metabolic syndrome: A cluster of conditions—abdominal obesity, dyslipidaemia, hypertension and hyperglycaemia—that elevate cardiometabolic risk.

References

1. Metabolic changes in response to varying whole-grain wheat and rye intake. npj Science of Food (2024).
2. Associations of types of grains and lifestyle with all-cause mortality among Chinese adults aged 65 years or older: a prospective cohort study. Journal of Translational Medicine (2023).
3. A systematic comprehensive longitudinal evaluation of dietary factors associated with acute myocardial infarction and fatal coronary heart disease. Nature Communications (2020).
4. Whole grain intake associated molecule 5-aminovaleric acid betaine decreases β-oxidation of fatty acids in mouse cardiomyocytes. Scientific Reports (2018).
5. Associations of Whole Grain and Refined Grain Consumption With Metabolic Syndrome. A Meta-Analysis of Observational Studies. Frontiers in Nutrition (2021).