A system for monitoring and facilitating the control of a person's body weight, said system comprising: - a computer system that can be used to execute a weight control program (115) having a plurality of software elements that are adapted to facilitate the control of the person's body weight, at least one of the plurality of software elements comprising a weight tracker (310) that is adapted to receive periodically or occasionally updated body weights (322) of the user and that is adapted to show a progress graph (2002) of the person's body weight over time, where at least one of the plurality of software elements comprises a diary (304) that is adapted to receive and display the exercises and food products consumed by the person； and - a display device (232) that is adapted to present the progress graph (2002) of the person's body weight over time to the person, including the progress graph (2002) of the person's body weight in the course of time at least one user selectable indication consisting of at least one point in the progress graph (2002) of the person's body weight over the course of the time indicative of a period of time passed, which, when is selected by the person, shows the food consumed by the person during the past period of time； said progress graph (2002) of the person's body weight over the course of time including a plurality of milestones plotted in the progress graph (2002) indicative of the weight goals achieved by the person over time.Un sistema para hacer el seguimiento y facilitar el control del peso corporal de una persona, comprendiendo dicho sistema: - un sistema de informático que se puede emplear para ejecutar un programa (115) de control de peso que tiene una pluralidad de elementos de software que están adaptados para facilitar el control del peso corporal de la persona, comprendiendo al menos uno de la pluralidad de elementos de software un seguidor (310) de peso que está adaptado para recibir periódicamente o de vez en cuando pes
