Abstract MP005: Do Worksite Wellness Programs Improve Dietary Behaviors and Adiposity? A Systematic Review and Meta-analysis

Introduction: Worksites are promising venues for promoting health, given considerable time spent at work and opportunities for environmental change. Yet, the impact of worksite wellness programs (WWPs) on diet and adiposity, as well as the most relevant WWP components, are not established. Methods: Following MOOSE and PRISMA guidelines, we conducted a systematic review and meta-analysis of the impact of multi-component WWP trials (RCT or quasi-experimental) on diet and adiposity. Data were extracted in duplicate and pooled using inverse variance random effects meta-analysis. Pre-specified sources of heterogeneity (study design, world region, worksite type, duration, WWP components) were analyzed by meta-regression and subgroup analysis. Funnel plots, Begg’s, and Egger’s tests evaluated potential publication bias. Results: From 6612 abstracts, we identified 48 studies assessing WWPs and diet or adiposity. Most were in the US (54%) or Europe (23%), with diet (64%) and exercise/weight loss (20%) as main targets. Intervention components were variable (Figure). Most common outcomes were intakes of fruits and vegetables (F&V) (19 studies), total fat or fat subtypes (18), and dietary fiber (4); and BMI (35) and waist circumference (WC) (10). Median duration was 12 months (range: 1-48 mo). In pooled analyses, WWP increased intake of F&V, especially fruits (Figure). Significant effects were not identified for dietary fiber, total fat, or fat subtypes. WWP also reduced BMI (Figure) and WC (-2.03 cm, 95% CI:-3.88,-0.20). Trial duration significantly modified effects on BMI (2 ; 12+ mo: -0.16 kg/m 2 ; P-interaction=0.046); but not WC or F&V intake. Additional findings for heterogeneity, including WWP components, and publication bias will be presented. Conclusions: These novel findings support effectiveness of WWP for increasing F&V and reducing BMI and WC.