A therapy system for applying an electrical signal to an internal anatomical feature of a patient includes an implantable component and an external component. Initial values for the parameters of a therapy program can be incremented after a predetermined period of time by a predetermined amount to obtain a subsequent value of the parameter and therapy can be applied using the subsequent value. A sensor may be implanted within the patient to determine an activity level of the patient. Weight loss of the patient can be analyzed to determine whether the weight loss corresponds to the activity level of the patient.