NutriTrack: An Artificial Intelligence Application for Nutritional and Behavioral Tracking in Patients With Obesity in an Outpatient Obesity Clinic: A Prospective Observational Pilot Study

Inclusion Criteria

Inclusion Criteria: * Age 18 years or older. * Diagnosis of obesity, defined as body mass index 30 kg/m2 or higher, or overweight with comorbidities, defined as body mass index 27 kg/m2 or higher. * Active follow-up at the Obesity Clinic of Hospital Clínico San Carlos. * Regular possession and use of a smartphone with iOS or Android operating system. * Ability to read and understand Spanish. * Signed informed consent. Exclusion Criteria: * Active diagnosed eating disorder, including anorexia nervosa, bulimia nervosa, or binge eating disorder. * Cognitive impairment preventing autonomous use of the application. * Simultaneous participation in another nutritional intervention study. * Inability or refusal to use mobile technology. * Current pregnancy or breastfeeding. * Acute medical condition requiring hospitalization during the study period.