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The experiment: predictionsWe compared hunger ratings between participants who sampled a healthy food item with calorie information versus participants who sampled a healthy food item without calorie information versus a “no sample” condition. We predicted that those who eat a healthy food item in the calorie information condition will subsequently report that they feel hungrier compared to those who eat a healthy food item in the no calorie information condition or those who do not eat the sample.MethodParticipants and design. 90 undergraduate students (38 women) from Tilburg University were randomly assigned to the conditions of a 3 (food sample: healthy with calorie information vs. healthy without calorie information vs. no-sample) between-subjects design. The participants ranged in age from 18 to 37, with a median age of 22. The students received financial compensation (7 €) for their participation.Procedure and Materials. Participants in the sampling conditions were recruited to participate in a taste test of a Muesli/granola bar that was unwrapped and contained no identifying information. Participants in the no-sample condition were invited to participate in a marketing study rating the appearance of the bar. We asked all the participants in the sampling conditions to taste a sample of the same bar. In the healthy food item with calorie information condition, participants read that they were about to taste “a new health bar containing 78 calories, high levels of vitamins and fiber, and no artificial sweeteners.” In the healthy food item without calorie information condition, participants read that they were about to taste “a new health bar containing high levels of vitamins and fiber, and no artificial sweeteners.” Participants in these conditions then had a 10 gram sample of the bar. Those in the no-sample condition did not complete the taste test.Next, in order to assess the strength of the motive to fulfill their appetite, all participants rated how hungry they were at the present moment (7-point scale; 1 = not at all hungry, 7 = very hungry). Those in the no-sample condition rated their hunger but did not complete the taste test beforehand. After providing their hunger rating, they continued to rate how appealing they thought the bar was.
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