Premature coronary artery disease, often abbreviated PCAD, refers to significant narrowing of the coronary arteries occurring before age 60 in men and before age 70 in women. It is a growing public health concern because it robs people of decades of productive life and imposes heavy costs on health systems. More than 80 percent of people with PCAD have at least one modifiable risk factor, such as hypertension, diabetes, obesity, dyslipidemia, smoking, psychosocial stress, physical inactivity, or an unhealthy diet. Ischemic heart disease remains a leading cause of death and disability-adjusted life years both in Iran and globally, and its prevalence among younger adults is climbing, making the search for modifiable protective factors increasingly urgent.

The study was conducted within the framework of the IPAD project, which began in 2018 and recruited participants from cardiac catheterization and angiography units in roughly 14 cities across Iran. Uniquely, the study captured remarkable ethnic diversity, enrolling participants from Fars, Azari/Turk, Kurd, Arab, Lor, Gilak, Qashqai, and Bakhtiari backgrounds, with ethnicity determined by the birthplace of individuals and their parents. Cases were defined as adults with at least 75 percent stenosis in one coronary artery or at least 50 percent stenosis in the left main coronary artery, while controls had angiographically normal coronary arteries. Participants with prior confirmed coronary disease, prior interventions such as bypass surgery or angioplasty, implausible energy intakes below 800 or above 4,200 kilocalories per day, or recent herbal supplement use were excluded to improve data quality.

Dietary intake was assessed using a validated semi-quantitative food frequency questionnaire administered by trained interviewers, with participants reporting how often they consumed each of a long list of foods over the preceding year. The questionnaire showed acceptable validity and reproducibility for fruits and vegetables, with a de-attenuated Pearson correlation of 0.49 and an intraclass correlation of 0.57 for this food group. Blood samples were analyzed for fasting glucose and a full lipid profile, and dyslipidemia and diabetes were classified according to standard clinical guidelines. Severity of disease was quantified by the number of stenotic coronary arteries, and the researchers used both binary and ordinal logistic regression models to test whether fruit and vegetable intake related not only to the presence of PCAD but also to how severe it was.

The results were striking. In the fully adjusted model, participants in the highest quartile of fruit intake had 91 percent lower odds of PCAD than those in the lowest quartile, with an odds ratio of 0.09. For vegetables, the corresponding odds ratio was 0.04, a 97 percent reduction, and for total fruits and vegetables combined it was 0.05, a 95 percent reduction. The dose-response pattern was consistent, with each successive quartile of intake showing progressively lower risk and a highly significant trend across categories. Critically, the associations held within individual ethnic groups, including Azari, Fars, Gilak, Kurd, and a combined category of smaller groups, suggesting the protective pattern transcends cultural and culinary differences across the region.

The protective association extended to disease severity as well. Compared with the lowest intake quartile, the highest quartile of fruit consumption was associated with a 93 percent reduction in the odds of severe PCAD in the crude model, and this estimate barely changed after adjustment for confounders. For vegetables, the highest intake category was linked to a 97 percent reduction in severe disease, and combined fruit and vegetable intake showed a similarly powerful inverse relationship with severity. Sex-stratified analyses confirmed the pattern in both men and women, with top-quartile vegetable intake associated with odds ratios of 0.06 in males and 0.03 in females in the fully adjusted models.

To test the robustness of the findings, the researchers performed sensitivity analyses excluding participants with major cardiovascular risk factors, including diabetes, hypertension, and smoking. The inverse associations persisted in these restricted samples, with the highest intake categories of fruits, vegetables, and combined fruits and vegetables all retaining statistically significant protective odds ratios. This suggests the observed relationship was not simply an artifact of the presence or absence of the most obvious clinical risk factors, although the authors themselves caution that the very large effect sizes should be interpreted carefully, since residual confounding by other lifestyle factors and measurement error in dietary assessment may partly contribute to the magnitude of the estimates.

The biological plausibility of these findings rests on well-characterized mechanisms. Fruits and vegetables are dense in soluble and insoluble dietary fiber, vitamins, carotenoids, flavonoids, minerals, and antioxidants. Soluble fiber slows gastric emptying and blunts postprandial rises in blood glucose and lipids, while viscous fibers can interfere with lipid and bile acid metabolism and lower serum LDL cholesterol. Both fiber types promote satiety through stomach distension and gut hormone signaling, supporting weight control and improved glucose metabolism over time. Antioxidants in plant foods help neutralize reactive oxygen species, which otherwise accelerate the oxidation of LDL cholesterol and the formation of foam cells and atherosclerotic plaques. Plant-rich diets also reduce inflammation, blood pressure, and platelet aggregation, and emerging evidence suggests they favorably shape the gut microbiota, whose fermentation products, the short-chain fatty acids, play roles in glucose, lipid, and cholesterol metabolism and immune regulation.

The study aligns with a substantial body of prior evidence. A 2017 dose-response meta-analysis of 66 studies found that each additional serving of fruits and vegetables per day was associated with roughly a 4 percent reduced risk of coronary heart disease, and that consuming 550 to 600 grams of vegetables daily was linked to a 30 percent lower risk of CHD. A 2020 meta-analysis reported that higher fruit consumption was associated with reductions of 9 to 18 percent in the incidence of cardiovascular disease, coronary heart disease, and stroke, while combined fruit and vegetable intake lowered disease incidence by 7 to 18 percent and related mortality by 11 to 27 percent. These estimates are far more modest than the odds ratios in the new study, a difference the authors attribute partly to the case-control design, the contrast between very low and very high intake levels, and the possibility of reverse causality, since subclinical disease may have influenced the dietary habits of cases before diagnosis.

Despite these limitations, which also include inevitable recall and selection bias and a marked imbalance between male and female participants, the study stands out as one of the largest investigations of diet and premature coronary disease in the Middle East, strengthened by angiography-confirmed diagnoses, standardized protocols across centers, and an ethnically diverse cohort. The authors conclude that promoting fruit and vegetable consumption is a simple and effective strategy for reducing PCAD risk, and they recommend that clinicians emphasize dietary interventions for at-risk individuals while public health initiatives improve access to fresh produce. They also call for well-designed randomized clinical trials to confirm the findings and clarify the mechanisms, noting that while the direction of the association is clear, the exact size of the protective effect remains to be pinned down with certainty.

Subject of Research: The association between fruit and vegetable consumption and the risk of premature coronary artery disease

Article Title: Association Between Fruits and Vegetables Consumption and Premature Coronary Artery Disease (PCAD): A Multi‐Center Case Control Study

Article References: Mohammadifard, N., Aghakhani, S., Zarepur, E., Khosravi Farsani, A., Azdaki, N., Salehi, N., Lotfizadeh, M., Ghaffari, S., Salari, A., Cheraghi, M., Assareh, A., Hassannejad, R., Soleimani, A., & Sarrafzadegan, N. (2026). Association Between Fruits and Vegetables Consumption and Premature Coronary Artery Disease ( PCAD ): A Multi‐Center Case Control Study. Food Science & Nutrition, 14(10), Article e72371. https://doi.org/10.1002/fsn3.72371

Image Credits: AI Generated

DOI: 10.1002/fsn3.72371

Keywords: premature coronary artery disease, fruits and vegetables, cardiovascular disease, case-control study, diet, Iran, coronary angiography, nutrition, dietary fiber, antioxidants, heart disease prevention, ethnicity

Premature coronary artery disease affects a significant portion of the population, often manifesting in those under the age of 55. The implications for early diagnosis and intervention are tremendous. By utilizing proteomic analysis, the researchers aimed to characterize the specific protein interactions that play a pivotal role in the disease’s progression. Such knowledge can unlock new avenues for preventing and treating this condition effectively.

At the heart of the study lies a sophisticated proteomic approach that leverages advanced mass spectrometry techniques. This methodology allows for the qualitative and quantitative profiling of proteins expressed in patients, providing a comprehensive overview of potential biomarkers linked to PCAD. These biomarkers can serve as valuable tools in both diagnosing the disease and monitoring its progression over time.

Additionally, the research team’s analysis included a focus on key biological pathways that stem from the identified proteomic changes. By mapping these pathways, they were able to elucidate the mechanisms through which proteins interact and contribute to the arterial pathology observed in PCAD. This pathway analysis not only highlights the complex interplay between various molecular players but also emphasizes the potential for targeted interventions.

One noteworthy aspect of the study is its emphasis on the differentiation between patients with early-onset disease versus those who develop coronary artery disease later in life. This distinction is crucial, as the underlying etiologies may differ significantly. The proteomic profile identified in younger patients may reveal novel risk factors or protective mechanisms that are not present in older populations. As such, tailored treatment approaches could be developed based on age-specific proteomic signatures.

Furthermore, the findings of this research underscore the importance of personalized medicine in the management of PCAD. With the growing body of evidence supporting the utility of proteomics, clinicians are presented with an opportunity to move beyond traditional risk assessment models. This shift could facilitate the development of individualized treatment plans that cater to the unique biochemical milieu of each patient, ultimately improving outcomes.

The implications for therapeutic intervention are profound. By identifying specific proteins and pathways that drive disease progression, pharmaceutical research can be directed towards the development of targeted therapies. For instance, if a particular protein is found to be overexpressed in patients with PCAD, drugs that inhibit its function could be explored as a means of slowing or halting the progression of the disease.

Additionally, as lifestyle factors play a critical role in cardiovascular health, the integration of proteomic data with patient lifestyle and genetic information could yield comprehensive risk profiles. This multifaceted approach would enable healthcare providers to not only implement preventive measures but also empower patients to make informed decisions regarding their health.

The emergence of systems biology, which considers the interactions of various biological systems, further complements the findings of this research. By adopting a holistic view of PCAD, researchers and clinicians can better understand how alterations at the molecular level translate into clinical outcomes. This integrative perspective is vital in addressing the complexities associated with cardiovascular diseases, especially those occurring earlier in life.

Moreover, the commitment to open-access data sharing in the field of proteomics fosters collaboration and innovation. Researchers worldwide can access and utilize these valuable datasets to further unravel the mysteries surrounding coronary artery disease. Such collaborative efforts are essential in accelerating the pace of scientific discovery and translating research findings into clinical practice.

In summary, the work of Cai and colleagues represents a significant step forward in our understanding of premature coronary artery disease through the lens of proteomics. By shedding light on the specific protein interactions and biological pathways at play, this research not only enriches our knowledge but also sets the stage for the development of targeted therapies and personalized medicine approaches. The future of cardiovascular health may very well hinge on continued advancements in this field.

As the medical community embraces these innovative strategies, the hope is that the burden of premature coronary artery disease can be alleviated, leading to a healthier future for countless individuals. This study serves as a reminder of the power of scientific inquiry and the importance of integrating diverse methodologies to confront the pressing challenges in medicine today.

The relevance of this research cannot be overstated. With ongoing evaluations of the proteomic data, it is anticipated that further discoveries will emerge, enhancing our comprehension of coronary artery disease and its many facets. As we look ahead, the implications for patient care and research are both exciting and critical. The integration of proteomic analyses in the study of cardiovascular diseases marks a pivotal moment in the evolution of medical research, heralding a new era of precision medicine.

By continuing to explore these uncharted territories, the potentials for improved patient outcomes only increase. The collaboration between proteomics, clinical practice, and biological research will undoubtedly yield breakthroughs essential for understanding coronary artery disease and transforming patient care.

Investing in such cutting-edge research will not only unravel the intricacies of premature coronary artery disease but also equip clinicians with the necessary tools to combat cardiovascular disorders on a broader scale. The synergy between innovative research and clinical application will ultimately define the next generation of therapeutic strategies in cardiology.

The findings presented offer an optimistic outlook for the future of cardiology. As we remain vigilant in addressing the complexities of coronary artery disease, studies like this enable us to grasp the interconnectedness of the human body at a molecular level, fostering hope for practical, impactful treatments that focus on patient well-being.

Despite the challenges that lie ahead, the journey towards understanding and combating premature coronary artery disease is reinforced by studies like this one that pave the way for a healthier tomorrow.

Subject of Research: Interaction and biological pathway analysis of proteomic products in patients with premature coronary artery disease.

Article Title: Interaction and biological pathway analysis of proteomic products in patients with premature coronary artery disease.

Article References: Cai, L., Shan, C., Chen, Y. et al. Interaction and biological pathway analysis of proteomic products in patients with premature coronary artery disease. Clin Proteom 22, 43 (2025). https://doi.org/10.1186/s12014-025-09561-5

Image Credits: AI Generated

DOI: https://doi.org/10.1186/s12014-025-09561-5

Keywords: Proteomics, coronary artery disease, premature, biological pathways, biomarkers, personalized medicine.