健康传播领域面临的最大挑战之一就是虚假信息泛滥。在信息冗杂且更迭迅速的社交媒体时代，这一问题尤为严重，不少学者开始探索应对虚假信息、科普正确信息的策略。在探究叙事文本的说服效果时，Nabi和Green（2015）创新性地提出了情感流的概念，指的是人们在接触媒介信息时经历的情感转换体验。他们认为，随着故事情节发展经历情感转换可以促进叙事的说服效果。因此，本文在应对代餐减肥这一典型虚假健康信息的背景下，将情感流置于叙事研究框架中，用实证的方法检验了Nabi和Green（2015）的理论假设，探索从叙事文本中唤起情感流是否能够影响目标群体的叙事传输与身份认同，进而影响他们的信念并促进其行为意愿。

本研究采用网络在线实验的方法，招募了208名被试，刺激材料主题选定为社交媒体上常出现的代餐减肥。研究者在四则刺激材料中设置了不同的情感要素，以此来比较包含情感转换的叙事文本（积极到消极与消极到积极）和不包含情感转换的叙事文本（消极和积极）的说服效果。并引入情感效价，探讨叙事文本结尾的情感效价对叙事效果有无影响。

研究发现，相较于无情感转换的叙事，情感流叙事更能引发叙事传输。而除了探讨情感流本身，实验设计同时引入了情感效价，研究结果显示在没有情感转换的情况下，消极叙事能比积极叙事引起更高的叙事传输，这与学界常讨论的“诉诸恐惧”叙事策略一脉相承。但在有情感转换的情况下，积极效价叙事能比消极效价叙事引发更高的叙事传输，且差距显著，这回应了Nabi对恐惧诉求策略起作用原因的猜测：诉诸恐惧的说服信息之所以能成功，也许是因为从恐惧到解脱与希望的情感转换起了作用，而不是研究者设计的恐惧因素本身。此外，本研究通过路径分析，发现角色认同对于叙事传输与故事一致性信念的关系起中介作用，故事一致性信念对于叙事传输与重复暴露、人际沟通、政策支持与购买意愿这四个行为意愿的关系起中介作用。此外，叙事传输和角色认同是相关的，但它们之间的确切关系缺乏探讨，本研究为探讨两者关系提供了实证支持。

最后，本研究也在前人的研究基础上，将行为意愿分为重复暴露、人际沟通、政策支持与购买意愿等要素，发现故事一致性信念对叙事传输和行为意愿起中介作用。

One of the biggest challenges facing the field of health communication is the proliferation of misinformation. This problem is particularly serious in the age of social media, where information is cumbersome and changes rapidly. Many scholars have begun to explore strategies to effectively combat false information and popularize correct information. When exploring the persuasive effect of narrative texts, Nabi and Green (2015) innovatively proposed the concept of emotional flow, which refers to the experience of emotional shift when exposed to media information. They argue that experiencing the emotional shift in a story can also contribute to the persuasive effect of a narrative. Therefore, in the context of combating the typical false health information about meal replacement weight loss, this paper puts emotional exile into the narrative research framework and empirically tests the theoretical assumptions of Nabi and Green (2015). Then explore whether the emotional flow evoked from the narrative text can affect the beliefs, attitudes, and behavioral intentions of the target group, and whether the effect is achieved by promoting narrative transportation and identification.

This study conducted an online experiment, and the sample was targeted at young people. As the interview survey before the study showed that the target group’s high frequency of contact with health information on social platforms is related to body management such as fat loss and weight loss. Therefore, the topic of the stimulus material for this study is the use of meal replacements to lose weight, which is contrary to the scientific facts. And different emotional elements were set in the four stimulus materials, so as to compare the narrative texts containing emotional shift (positive to negative and negative to positive) with the narrative texts without emotional shift(negative and positive) on persuasive effects. Aditionally, our study introduce emotional valence to explore whether the emotional valence at the end of the narrative text affects the narrative effect. Finally, a total of 208 valid sample data (75% female, 25% male) were collected.

The study found that, compared to narratives without emotional shift, emotional flow narratives were more likely to induce narrative transportation. In addition to discussing the emotional flow itself, this study also introduces emotional valence, and finds that in the absence of emotional shift, negative narratives can induce higher narrative  transportation than positive narratives, which is in line with the "appeal to fear" strategy often discussed in academic fields . However, in the case of emotional shift, positive valence narratives can induce higher level of narrative transportation than negative valence narratives, and the gap is significant, which responds to Nabi's speculation on the reason why the fear appeal strategy works: The success of persuasive messages that appeal to fear may be due to the emotional shift from fear to relief and hope, rather than the fear factor itself that the researchers engineered. In addition, identification plays a mediating role in the relationship between transportation and story-consistent belief, while story-consistent belief plays a mediating role in the relationship between transportation and repeated exposure, interpersonal communication, policy support and purchase intention. At last, narrative transportation and identification are related, but the exact relationship between them is poorly explored. Our study provided a empirical support for exploring the relationship between the two.