Abstract：
People often fail to acknowledge external influences on their food intake, but there might be some circumstances in which people are willing to report that those external factors influenced their behavior. This study examined whether participants who believed that they had overeaten would indicate that the portion size they were served influenced their food intake. Participants (119 women) ate a pasta lunch at two separate sessions, one week apart. At the second session, participants were randomly assigned to receive either a regular portion of pasta (the same portion as the first session) or a large portion of pasta (a portion that was twice the size), and to receive false feedback about their food intake indicating that they had either eaten about the same as or substantially more than they had at the previous session. Participants were then asked to indicate the extent to which the amount of food served influenced how much they ate at that second session. Compared to participants who were informed that they had eaten the same amount across the two sessions, those who were informed that they ate more at the second session reported a stronger influence of the amount of food served if they also received a large portion of pasta, but not if they received a regular portion of pasta. These findings suggest that the willingness to implicate external influences (e.g., portion size) on one\'s food intake may be driven by a self-serving bias, providing an \"excuse\" for overeating. However, the external cue must be salient enough to be a plausible explanation for one\'s behavior.
摘要：
人们经常不承认外部影响他们的食物摄入，但是在某些情况下，人们可能愿意报告这些外部因素影响了他们的行为。这项研究调查了那些认为自己吃得过多的参与者是否会表明他们所吃的份量会影响他们的食物摄入量。参与者（119名妇女）在两个单独的会议上吃了意大利面午餐，相隔一周。在第二届会议上，参与者被随机分配接受常规部分的面食（与第一次会议相同的部分）或大部分的面食（一部分是大小的两倍），并收到有关他们的食物摄入量的错误反馈，表明他们吃的食物与上一次会议大致相同或实质上更多。然后要求参与者指出所提供的食物量在多大程度上影响他们在第二次会议上吃了多少。与被告知在两次会议中吃了相同数量的参与者相比，那些被告知他们在第二届会议上吃得更多的人报告说，如果他们也接受了大部分意大利面，那么所提供的食物数量会受到更大的影响，但如果他们收到一份常规的意大利面就不会了。这些发现表明，暗示外部影响的意愿(例如，部分大小)对一个人的食物摄入量可能是由自我服务偏见驱动的，为暴饮暴食提供一个“借口”。然而,外部线索必须足够突出，以便为一个人的行为提供合理的解释。
