Highlights
- Adherence to a healthy plant-based diet-lifestyle (hPDI-Lifestyle) is associated with a significant reduction in coronary heart disease (CHD) incidence across all genetic risk strata.
- A profound interaction effect exists: individuals with high genetic risk derive a 44% reduction in CHD risk through ideal lifestyle adherence, compared to a 20% reduction in those with low genetic risk.
- The hPDI-Lifestyle score integrates nutritional quality (hPDI) with non-smoking status, physical activity, and moderate sleep duration, providing a holistic metric for cardiovascular health.
- Findings emphasize the potential for personalized lifestyle interventions to offset inherited cardiovascular vulnerabilities.
Background
Coronary heart disease (CHD) remains a leading cause of morbidity and mortality globally, necessitating multifaceted prevention strategies. While the benefits of plant-based diets are well-documented, recent nutritional epidemiology has distinguished between healthy plant-based diets (rich in whole grains, fruits, and vegetables) and unhealthy plant-based diets (high in refined grains and sugar-sweetened beverages). However, the preventive capacity of these dietary patterns when combined with other health behaviors—such as smoking cessation, physical activity, and adequate sleep—has remained under-characterized.
Furthermore, the clinical community is increasingly focused on the interplay between modifiable behaviors and non-modifiable genetic factors. While individual studies have shown that a healthy lifestyle can lower risk even in the presence of high genetic susceptibility, the specific interaction between a plant-based centric lifestyle and polygenic risk scores (PRS) for CHD represents a critical gap in personalized medicine. Understanding whether lifestyle benefits are uniform or amplified in high-risk genetic cohorts is essential for tailoring clinical recommendations.
Key Content
The Evolution of the Plant-Based Diet Index (PDI)
Early research into vegetarianism often failed to account for the quality of plant-based foods. The development of the Healthy Plant-Based Diet Index (hPDI) allowed researchers to weigh healthful plant foods positively and unhealthful plant foods (and animal foods) negatively. This methodological shift revealed that not all plant-based diets are cardio-protective. The current analysis by Wang et al. (2026) expands this concept into a multidimensional “hPDI-Lifestyle score,” recognizing that diet does not exist in a vacuum but operates alongside other lifestyle determinants.
Methodological Framework of the Rotterdam Study Analysis
The study utilized data from 7,764 participants in the Rotterdam Study, a prospective population-based cohort. With a mean age of 63 and a majority female population (60.1%), the cohort provides robust insights into aging populations where CHD incidence is most prevalent. The hPDI-Lifestyle score was constructed using four pillars:
- Healthy Plant-Based Diet: High intake of whole grains, fruits, vegetables, nuts, and legumes.
- Non-smoking: Current status of never or former smoking.
- Physical Activity: Adherence to recommended metabolic equivalent task (MET) hours per week.
- Sleep Duration: Maintaining a moderate duration (7–8 hours), which has recently emerged as a vital cardiovascular regulator.
Interaction with Polygenic Risk Scores (PRS)
The researchers employed a Polygenic Risk Score for coronary artery disease to stratify participants into low, intermediate, and high genetic risk categories. By using multivariable Cox proportional hazard models, the study estimated the Hazard Ratios (HR) for CHD across 116,324 person-years of follow-up, during which 918 cases were documented.
Major Clinical Outcomes
The findings provide a striking example of effect modification. Compared to participants at high genetic risk with poor lifestyle adherence (the reference group):
- Low Genetic Risk + Ideal Lifestyle: HR 0.80 (95% CI 0.71–0.90). This represents a 20% risk reduction relative to their genetic baseline.
- High Genetic Risk + Ideal Lifestyle: HR 0.56 (95% CI 0.49–0.64). This represents a 44% risk reduction.
The p for interaction was highly significant (< 0.001), indicating that the protective effect of a healthy plant-based lifestyle is significantly more pronounced in those who are genetically predisposed to CHD. This suggests that while lifestyle is beneficial for everyone, it acts as a critical "risk-mitigator" for those with the highest inherited vulnerability.
Expert Commentary
The results of this analysis provide a powerful counter-narrative to genetic determinism. Clinicians often encounter patients who feel that their family history of heart disease makes clinical outcomes inevitable. The Rotterdam Study data suggests the opposite: those with the highest genetic risk have the most to gain from aggressive lifestyle modification. From a mechanistic perspective, a healthy plant-based diet reduces systemic inflammation, improves endothelial function, and optimizes lipid profiles—pathways that are often dysregulated in individuals with high PRS for CHD.
However, several considerations remain for clinical practice. First, the hPDI-Lifestyle score includes sleep duration, an often-overlooked metric in cardiovascular risk assessment. Physicians should consider sleep hygiene as integral to heart health as diet and exercise. Second, the study’s population was primarily older adults of European descent; while the biological principles likely apply across ethnicities, further research is needed in more diverse cohorts to validate the interaction magnitude. Lastly, the “plant-based” definition used here emphasizes quality, not just the absence of meat. A patient eating refined pasta and sugary snacks is “plant-based” but is not achieving the hPDI-Lifestyle benefits observed in this study.
Conclusion
The prospective analysis of the Rotterdam Study cohort confirms that a healthy plant-based diet, when integrated with non-smoking, activity, and proper sleep, significantly lowers the incidence of CHD. Most importantly, it demonstrates that genetic risk is not destiny. The observed 44% risk reduction in high-genetic-risk individuals provides a strong evidence base for personalized prevention strategies. Future research should focus on the implementation of these findings in clinical settings, exploring how sharing PRS data with patients might motivate the adoption of high-quality plant-based lifestyles.
References
- Wang XJ, Voortman T, Bos D, Kavousi M, Ghanbari M, Conrad N, Schram MT, Steur M. Association between healthy plant-based diet-lifestyle (hPDI-Lifestyle) score and incidence of coronary heart disease, and effect modification by genetic predisposition: a prospective analysis in a population-based cohort. Lancet Reg Health Eur. 2026 Feb 19;64:101619. PMID: 41767894.
- Satija A, et al. Healthful and Unhealthful Plant-Based Diets and the Risk of Coronary Heart Disease in U.S. Adults. J Am Coll Cardiol. 2017;70(4):411-422. PMID: 28728612.
- Khera AV, et al. Genetic Risk, Adherent Lifestyle, and Type 2 Diabetes. N Engl J Med. 2016;375(24):2349-2358. PMID: 27959714.
