The internet opens the gate to an unlimited amount of information that is available to everyone. Credibility assessment has shifted to the information seeker, who must choose what is trustworthy. This examination focuses on the importance of diverse credibility cues and components in relation to eating disorders. Quantitative and qualitative investigations based on data are presented. The quantitative study addresses the importance of the diverse components of the cues for the trustworthiness assessment on websites focused on nutrition, weight loss, and fitness, and an examination of the role of several types of motivation. The data were collected in 2016 via an online survey through Czech websites oriented towards eating habits, diets, or fitness.. The original sample of 1,002 users aged 13 to 62 was reduced to the final sub-sample of 477 adolescents (13-19) and young adults (20-26). The motivation to lose weight was significantly related to the increased importance of author-oriented components of published information and feedback provided by other users. As compared to adolescents, young adults perceived references to experts as more important in their assessment. Qualitative study, which focused on the evaluation of the credibility of online information from the perspective of young women who suffer with eating disorders, added broader insight. Thematic analysis was used to analyze 30 individual semi-structured interviews with Czech women aged 16-28 who suffer with eating disorders. Four main themes were identified: Respondent Characteristics, Content Credibility Cues, Characteristics of Other Users, Website Credibility Cues. The specifics of eating-disorder phases are described within all of the themes. The social element attached to credibility cues was prevalent throughout most of the themes. The opinions of others, their views, activity, and similarity were cues that helped respondents assess the credibility of the users and their information. Both examinations reveal importance of social elements in credibility assessment