Effectiveness of Plant-Based Diets in Managing Type 2 Diabetic Diseases: A Systematic Review of Randomized Controlled Trials and Cohort Studies
Richard Moombe Kalenga *
Department of Nutrition Science, School of Applied Science and Technology, Mukuba University, Zambia.
*Author to whom correspondence should be addressed.
Abstract
Background: Type 2 diabetes (T2D) is a prevalent and growing global health issue. Dietary interventions, particularly plant-based diets, have garnered increasing attention for their potential to manage and mitigate the effects of T2D. This systematic review aims to evaluate the efficacy of plant-based diets in improving metabolic outcomes in individuals with T2D.
Methods: A comprehensive literature search was conducted across multiple databases (PubMed, Scopus, and Google Scholar) to identify studies published between 2000 and 2024. Randomized controlled trials (RCTs), cohort studies, and systematic reviews that investigated the impact of plant-based dietary interventions on T2D management were included. The primary outcomes assessed were changes in HbA1c levels, insulin sensitivity, body weight, and lipid profiles. Data were synthesized using a qualitative narrative approach.
Results: A total of 27 studies met the inclusion criteria, comprising 15 RCTs, 4 cohort studies, and 1 systematic review. The majority of studies (78%) were of high quality. Plant-based diets were associated with significant reductions in HbA1c, LDL cholesterol, and body weight, as well as improved insulin sensitivity. Notably, the benefits were more pronounced in studies conducted in high-income countries. However, variability in outcomes was observed in low-resource settings, where challenges such as food availability, adherence, and socioeconomic factors were prevalent.
Conclusions: Plant-based diets are an effective dietary intervention for the management of T2D, particularly in high-income regions. However, more research is needed in low-resource settings to understand the feasibility, sustainability, and long-term impacts of such diets. Public health policies should focus on making plant-based foods more accessible and affordable, particularly in regions where diabetes prevalence is high. Future studies should aim to address gaps related to adherence, long-term sustainability, and the role of socioeconomic factors in diabetes management.
Keywords: Plant-based diets, type 2 diabetes, metabolic outcomes, randomized controlled trials, systematic review, insulin sensitivity