Background: Nutrition counseling and education provided by registered dietitians (RD) is an efficacious service for improved health outcomes. Limitations of in person education in clinical settings include RD access, time constraints, and lack of hands-on education tools. Immersive virtual reality (iVR) technology may be able to improve the patient experience by providing meaningful educational experiences. Methods: Participants (n=44,29 female, BMI=25.31 ± 5.7, Age=27.6 ± 13.9) were randomized to receive iVR or an in-person nutrition education experience both of which focused on the nutritional principles of portion size and calorie density. Both educational materials were developed by an RD and similar scripts were used for consistency between the two versions. However, the virtual reality program allowed for interactive experiences with food items. This included activities such as selecting and cutting foods to adjusting portion sizes. The portion control self-efficacy survey was administered preand post-experience. Repeated measures ANOVA was used to determine the effect of education on portion size self-efficacy and knowledge. Results: Portion size self-efficacy improved across time points in both in-person (n=26) and VR (n=18) education conditions (p=0.006). No main effect of condition or interaction between condition and time was shown to be significant, indicating both interventions improved scores similarly. Conclusions: iVR nutrition education shows promise to be similarly effective to an in-person RD experience. This technology is best applied in conjunction with RD medical nutrition counseling and can serve a wide range of educational topics. Future research is needed to validate this tool in clinical settings and among at-risk populations that may have lower baseline portion size-self efficacy.