Gastric stimulation systems and methods are provided for treating a patient, particularly by modifying behavior of the patient leading to excess weight loss. In some embodiments, such weight loss is achieved with a combination approach which includes two or more of the following: acute screening of the potential patients, gastric stimulation, induction of symptoms or specific behaviors and integration of patient management data into the treatment plan. Gastric stimulation is provided to portions of the gastrointestinal tract, particularly the stomach, with the use of at least one electrode. A variety of gastric stimulation systems may be used, including stimulators that are endoscopically placed, laparoscopically placed or placed by modified or combination methods.