This project aims to identify psychological variables and cognitive conflicts that facilitate or hinder the acquisition and maintenance of healthy habits in people interested in improving their health habits, with an international study (Spain, Mexico, Chile and Portugal) during the global pandemic period. To this end, through health promotion campaigns, the aim is to recruit volunteer participants who want to incorporate healthy lifestyle habits. These volunteers will be monitored for three months in their personal evolution by working with advice on nutrition and physical activity based on the WHO document (2004). Along with the initial recording of demographic and psychological variables, participants will record data on their diet and physical activity, among other variables.