The study was interrupted due to the small number of patients constituting the sample.

Obesity, which is the second leading cause of preventable death in the world, affects all the systems in the body and affects many physiological problems, as well as the mental state, body image and quality of life of the individual. For this reason, obese individuals try various treatment methods in order to get rid of obesity, and in cases where these methods fail, they often prefer bariatric surgery. It is very important that patients who will undergo bariatric surgery can adapt to the anatomical changes in their body and shape their lifestyle accordingly. Otherwise, it is inevitable for patients to face various complications after surgery. After bariatric surgery, a structured training program in the preoperative period is of great importance in order for the patient to adapt to the changes in his body, to prevent the development of possible complications, to be affected by the negativities that may occur due to the current change, and to prepare for the new lifestyle. In this context, the main subject of this research is to enable individuals to gain healthy lifestyle behaviors by providing mobile-based training and consultancy services that enable them to easily access the right information at the desired time and place.

Inclusion Criteria:

• Being literate,
• Being able to understand, speak Turkish and not have a hearing impairment,
• First time to undergo bariatric surgery,
• Absence of any psychiatric disorder that will reduce the ability to comprehend and understand,
• Ability to use Android-based smartphones,
• Agreeing to participate in the research.

Exclusion Criteria:

• Patient's desire to quit the study