Nutrition Reviews, 67(6), 333-342. doi: 10.1007/s13668-016-0172-8 One primary study suggests this sales "uplift" may be greater for unhealthy products, compared to healthy products.7Nakamura, R., Suhrcke, M., Jebb, S.A., Pechey, R., Almiron-Roig, E., & Marteau, T.M. (2015).