A weight management system includes a control wristwatch including a processor programmed with a weight management program and an RF receiver, a weight scale for collecting weight data from a user and including an RF transmitter for transmitting the weight data to the wristwatch, and a pedometer or heart rate monitor for collecting exercise data from the user and including an RF transmitter for transmitting the exercise data to the wristwatch. The weight management program is operable on the weight data to determine a plan for managing the weight of the user through exercise, and operable on the exercise data to monitor execution of the plan.