Workplace-based dietary intervention study: Effects on body mass index and fat mass in metalworking industry workers

Background: Overweight and obesity are prevalent health issues with significant implications for workers’ health, productivity, and workplace safety. This study aimed to evaluate the effects of dietary modifications and workplace interventions on health outcomes among metalworking industry workers. Methods: A total of 683 workers participated in a workplace-based intervention focusing on dietary modifications, physical activity promotion, and health monitoring. Anthropometric measures, including BMI and fat mass, were recorded at baseline and follow-up using bioimpedance analysis. Statistical analyses included paired t-tests and mixed linear models to assess changes over time. Results: Significant reductions in BMI and fat mass were observed among participants. At follow-up, 56.95% of workers achieved BMI reduction, with 29.31% reaching the target of at least 4%. Similarly, 52.27% reduced fat mass, with 77.03% achieving reductions of at least 2%. Night shift workers demonstrated better adherence and outcomes compared to day shift workers. Improvements in psychophysical well-being and productivity were also reported. Conclusions: Workplace-based interventions can effectively address obesity and overweight, improving employees’ health and organizational productivity. Future research should focus on long-term sustainability, randomized controlled trials, and broader demographic inclusion to enhance the generalizability of findings.