Nutritional Interventions and Their Impact on Chronic Disease Prevention: A Systematic Review

Chronic diseases such as cardiovascular disease, type 2 diabetes, obesity, and certain cancers represent the leading causes of mortality worldwide. Increasing scientific evidence suggests that diet plays a pivotal role in both the development and prevention of these conditions. This systematic review aims to synthesize recent findings on the effectiveness of nutritional interventions in reducing the risk or progression of major chronic diseases. Using PRISMA 2020 guidelines, we searched four major databases—PubMed, Scopus, Web of Science, and the Cochrane Library—for peer-reviewed studies published between 2016 and 2024. A total of 42 studies, including randomized controlled trials, cohort studies, and meta-analyses, met the inclusion criteria.The findings indicate that dietary patterns such as the Mediterranean diet, the DASH (Dietary Approaches to Stop Hypertension) diet, plant-based regimens, and high-fiber interventions consistently demonstrate positive outcomes in disease prevention. Specifically, adherence to the Mediterranean diet was associated with significant reductions in cardiovascular risk and metabolic syndrome indicators. The DASH diet showed strong evidence for lowering blood pressure, while plant-based diets were linked to improved weight management and inflammatory markers. Despite the effectiveness of these interventions, variability in adherence, socioeconomic factors, and cultural differences were identified as key barriers. This review highlights the critical role of evidence-based nutritional strategies in public health policy and chronic disease prevention. Tailored interventions that consider cultural, economic, and behavioral factors are essential for maximizing health outcomes and ensuring long-term sustainability.