Naturally green, irrationally lean: How background scenery affects calorie judgments.

Extant research has found that the addition of vegetables to a meal induces a "health halo," thereby lowering the perceived calorie content of the entire dish. We investigated whether environmental stimuli that convey naturalness could trigger such a halo effect. Specifically, we tested whether meals accompanied by a natural, as opposed to an urban, background scenery were estimated to be lower in their calorie content and whether this effect was moderated by the perceived healthiness of the food alternatives. In a mixed (between-within-subjects) design experiment, 200 participants estimated the calorie content and rated the healthiness of 18 complex meals presented against either a natural or an urban background. Our results showed no main effect of the food rating background. However, there was a negative relationship between inferred food healthiness and the estimated calorie content of the meals. In addition, we found a significant interaction between food rating background and inferred healthiness of the evaluated food alternatives. Specifically, when participants evaluated meals against a natural background, they rated relatively unhealthy food alternatives as lower in calories than when they evaluated such alternatives against an urban background. Overall, our results highlight the moderating role of perceived food healthiness in studying the effects of environmental cues on consumers' calorie judgments.