Media play a crucial role in informing the public on all topics, including those related to health and the promotion of healthy lifestyle habits. Therefore, media must carefully select the information they present, as it can affect people's perception and health. In a world where information spreads quickly and misinformation even faster, maintaining credibility is essential for ensuring reliable sources of information and public trust in journalism. Additionally, marketing campaigns and promotional products are often combined with informative articles where experts and laypeople share unverified information or blur the line between objectivity and personal interests. Sensationalism, lack of journalistic expertise, bias, and lack of context and sources are just some of the problems. The aim of the research is to determine the credibility of reporting on weight loss methods in leading Croatian online media, particularly in the context of the quality of sources. Also, the goal is to understand the perspective and approach of editors of selected portals towards creating credible media text about weight loss methods. An analysis of the credibility of reporting on weight loss methods on a representative sample of articles published in 2023 on the portals: Jutarnji.hr, Večernji.hr, 24sata.hr and Index.hr was conducted using a combination of quantitive content analysis and semi-structured interview with portal editors. The research questions are: How credible is the reporting in articles about weight loss methods on the four most-read Croatian portals, and how do editors describe the research and preparation process of articles on weight loss in the context of credibility and sources of information and preservation of human health? The obtained results show that journalistic standards of credibility are not fully respected. The use of mostly short articles, sensationalist headlines, referring to single source, 41% of articles not mentioning experts at all, and minimal reference to specific scientific studies on weight loss methods were identified. The interviewed editors are aware of these shortcomings, citing the speed of publication and lack of time as the main reasons that sometimes results in such lapses in the context of credibility reporting. This study contributes to a better understanding of journalistic reporting on weight loss methods and health, and calls for greater dedication to topics that can impact health and increased cooperation between journalists and experts to ensure that all published information is verified accurate, credible, and evidence-based.