Laughter Yoga Effect Depression, Serotonin Levels With Bariatric Surgery Patient

The goal of this a quasi-trial model with pre and post-test control group is to determine the effect of laughter yoga on depression and serotonin levels in patients undergoing bariatric surgery. The main question's it aims to answer are: * Question 1: Does laughter yoga reduce the level of depression in patients undergoing bariatric surgery? * Question 2: Does laughter yoga increase serotonin levels in patients who have undergone bariatric surgery? 158 patients who underwent bariatric surgery in the General Surgery Service of a university hospital in Malatya/Turkey and 6-24 months after the operation participated in the study. Sample size was determined using power analysis and 62 patients were sampled. 31 patients were determined as the control group and 31 patients as the experimental group. 10 sessions of laughter yoga were applied to the patients in the experimental group who agreed to participate in the study that met the criteria. No intervention was made in the control group.