Healthy behaviors have traditionally been promoted through persuasive messages that provide information about figures or arguments and are designed with an openly persuasive objective. However, other strategies have recently been established, such as the use of narrative messages and mixed formats (which combine information and tell a story). The evidence is not conclusive about the efficacy of these three modalities of persuasion (informational, narrative, and mixed) nor about the mechanisms responsible. Methodology: Two experiments were carried out that compared the effects of the three modalities of persuasive messages mentioned and that were designed to promote sleep hygiene as a factor in controlling body weight. In addition, the role of involvement with the theme of the message and the need for cognition were considered as possible moderator variables. Results: It was observed that...