Background: Plant-based diets are associated with reduced cardiometabolic risk, yet the influence of lifestyle behaviors on these benefits remains insufficiently understood. Objective: To assess the combined impact of dietary patterns and lifestyle behaviors on body composition, lipid profiles, and inflammatory biomarkers in healthy young adults. Methods: In this cross-sectional study, 155 participants aged 18-39 years were categorized into four dietary groups: vegans (n = 48), vegetarians (n = 49), pescatarians (n = 23), and omnivores (n = 35). Body composition was measured using bioelectrical impedance analysis. Blood samples were analyzed for lipid parameters, apolipoproteins, lipoprotein(a), and inflammatory markers (IL-6, TNF-α, and hsCRP). Participants were further stratified based on behavioral factors, including physical activity, sleep duration, smoking, and alcohol consumption. Results: Vegans demonstrated the lowest body fat and visceral adipose tissue, along with the second-highest skeletal muscle mass. Significant intergroup differences were observed in total cholesterol (p = 0.032), HDL-C (p = 0.006), and triacylglycerols (p = 0.005). Among vegans, suboptimal lifestyle behaviors were associated with elevated LDL-C, non-HDL-C, and homocysteine levels (p < 0.05). Positive correlations were identified between ApoB and BMI (r = 0.517) and between IL-6 and waist-to-hip ratio (ρ = 0.499). Conclusions: A vegan diet, when combined with healthy lifestyle behaviors, is associated with favorable body composition and lipid profiles. Regardless of dietary pattern, maintaining a healthy body weight and minimizing visceral adiposity are essential for reducing cardiovascular and inflammatory risk. These research findings underscore the importance of integrating high-quality plant-based diets with lifestyle modifications and advanced modeling approaches.
Keywords: apolipoproteins; body composition; cardiovascular risk; inflammatory markers; lifestyle factors; lipid profile; plant-based diets.