Link Between Heart-Healthy Diet and Reduced Risk of Heart Disease

Overview of the Study

A recent study published in *Scientific Reports* explored the relationship between a heart-healthy diet and the risk of developing heart disease. Previous research has consistently highlighted the advantages of maintaining a healthy diet in mitigating the risks associated with heart disease and age-related illnesses. A heart-healthy diet typically focuses on portion control, a high intake of fruits and vegetables, limited unhealthy fats, and sources of low-fat protein, such as fish and eggs. Additionally, it emphasizes reducing salt consumption and incorporating whole grains.

Understanding Metabolite Profiles

Advancements in research have allowed scientists to analyze metabolite profiles, which offer insights into the biological mechanisms linked to heart disease. Metabolites are small molecules produced during metabolism, with primary metabolites playing critical roles in growth and development, such as lactic acid and glutamic acid. In contrast, secondary metabolites, which include substances like growth hormones and antibiotics, contribute to overall health but are not directly involved in growth processes. Profiling these metabolites has enhanced understanding of age-related diseases, including cardiovascular conditions, and has facilitated the identification of risk factors.

Research suggests that metabolites can be influenced by dietary choices, as food serves as a primary source of various metabolites, triggering metabolic responses. However, few studies have explored the overall relationship between diet and metabolites. Identifying links between dietary patterns and metabolites could provide deeper insights into how diet may help prevent chronic conditions like heart disease.

Study Objectives and Methodology

To investigate these associations, European researchers conducted a study aimed at pinpointing metabolites linked to adherence to a healthy diet. They also assessed whether these metabolites correlate with a reduced risk of cardiovascular diseases and can predict the development of these chronic conditions. Their findings were published in *Scientific Reports*.

The study utilized data from the Whitehall II cohort, which encompasses British middle-aged men and women. Researchers evaluated adherence to dietary guidelines using the Alternative Healthy Eating Index (AHEI), an established dietary index indicating that higher scores correlate with a lower risk of cardiovascular disease and related mortality.

Study Findings

The analysis involved 4,824 participants from the Whitehall II study, with a follow-up period averaging 15.8 years. Participants recorded an average of 80 metabolites, with an AHEI score of 50.7. A higher AHEI score indicated better adherence to healthy dietary guidelines, which was associated with lower concentrations of metabolites linked to glucose generation and reduced chronic inflammation.

A heart-healthy diet is characterized by a lower intake of unsaturated fatty acids, which are beneficial fats that replace trans or saturated fats. This dietary approach is essential for lowering cholesterol and minimizing heart disease risk. The study revealed that higher levels of unsaturated fatty acids and an increased ratio of unsaturated to total fatty acids were linked to better dietary adherence. Conversely, lower adherence to a healthy diet correlated with elevated saturated fatty acid levels and an increased long-term risk of cardiovascular disease.

This analysis of the relationship between 41 metabolites and AHEI scores was replicated in the Young Finns study, reaffirming that a higher AHEI score is strongly associated with adherence to a healthy diet and beneficial fatty acids.

Conclusion

In conclusion, the researchers identified several metabolites that significantly correlate with adherence to a heart-healthy diet. Their findings suggest that following a healthy diet reduces the risk of cardiovascular disease, particularly in relation to specific fatty acids known to lower such risks. Identifying these metabolites is crucial, as they may serve as molecular mediators linking poor dietary habits to increased cardiovascular disease risk, potentially enabling future predictions of this chronic condition through metabolite profiling.

Written by Lacey Hizartzidis, PhD
Reference: Akbaraly T, Würtz P, Singh-Manoux A, et al. Association of circulating metabolites with healthy diet and risk of cardiovascular disease: analysis of two cohort studies. Sci Rep. 2018;8(1):8620. doi:10.1038/s41598-018-26441-1