Gut-Friendly Diet Linked to Lower CHD Mortality Risk

Key Summary

• • A higher Dietary Index for Gut Microbiota (DI-GM) score was associated with a lower risk of all-cause mortality in adults with coronary heart disease (CHD).
  • Researchers analyzed NHANES 2005–2018 data from 1,537 adults with CHD, representing more than 8.1 million U.S. adults.
  • Diets rich in fiber, whole grains, fermented dairy, broccoli, legumes, green tea, coffee, and soy were linked with better outcomes.
  • The relationship between DI-GM and mortality was nonlinear, suggesting benefits become more evident at higher dietary scores.
  • Diabetes status appeared to influence the association, while age, sex, BMI, smoking, and hypertension did not significantly modify the results.
  • The observational findings support gut-friendly diet patterns as a potential tool for nutritional risk stratification, though they do not establish causation.
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Can a Gut-Friendly Diet Improve Survival in Coronary Heart Disease?

Diet plays a central role in cardiovascular health, but growing evidence suggests its influence extends beyond traditional risk factors. A recent study published in Medicine found that a gut-friendly diet measured using the Dietary Index for Gut Microbiota (DI-GM) was associated with a lower risk of all-cause mortality among adults with coronary heart disease (CHD).

Researchers analyzed data from the National Health and Nutrition Examination Survey (NHANES) collected between 2005 and 2018. The study included 1,537 adults with coronary heart disease, representing an estimated 8.1 million U.S. adults. Participants were followed until death or December 31, 2019, allowing investigators to examine whether dietary patterns linked to healthier gut microbiota influenced long-term survival.

The DI-GM evaluates dietary habits based on 14 food components. Higher scores reflect greater intake of foods believed to promote beneficial gut microbes, including whole grains, dietary fiber, fermented dairy products, broccoli, avocado, chickpeas, soybeans, green tea, cranberries, and coffee, while lower scores are associated with greater consumption of refined grains, processed meat, red meat, and high-fat diets.

Higher DI-GM Scores Were Associated with Lower Mortality

Participants with DI-GM scores of 5 or higher experienced significantly lower all-cause mortality than those with the lowest dietary scores. Although each one-point increase in DI-GM initially appeared beneficial, this association weakened after researchers adjusted for multiple demographic, lifestyle, clinical, and laboratory factors. However, when participants were compared by dietary score categories, higher-scoring groups continued to demonstrate meaningful survival benefits.

The findings also revealed a nonlinear relationship, indicating that mortality risk did not decrease at a constant rate with every increase in DI-GM score. Instead, greater dietary improvements appeared to provide stronger benefits once participants reached higher diet quality categories.

Subgroup analyses showed consistent findings across age, sex, body mass index, smoking status, alcohol use, hypertension, and socioeconomic status. Diabetes, however, influenced the association, suggesting gut microbiota-focused nutrition may have varying effects in patients with diabetes and coronary heart disease.

What the Findings of Gut-Friendly Diet Mean for Clinical Practice

The study highlights the growing interest in gut microbiota-targeted nutrition as part of cardiovascular care. While the observational design prevents conclusions about cause and effect, the results suggest that dietary patterns supporting gut microbial diversity could become an important component of nutritional assessment and risk stratification for patients with coronary heart disease.

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Healthcare professionals should interpret the findings alongside the study’s limitations, including reliance on a single 24-hour dietary recall, self-reported coronary heart disease, residual confounding, and the inclusion of only U.S. participants.

Future prospective studies and randomized clinical trials are needed to determine whether improving gut microbiota through dietary interventions can directly reduce mortality. Until then, encouraging dietary patterns rich in fiber, plant-based foods, whole grains, and fermented foods remains consistent with current cardiovascular nutrition recommendations and may provide additional benefits through the gut-heart axis.

Source:

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