Early vs. Late Time-Restricted Eating in Adolescents With Obesity (EL TREA)

Determine the effectiveness of how limiting the time you eat within an early or late eating window and fasting for remainder of the day will impact weight loss and body mass index (BMI).

Inclusion Criteria: * 12-21 years with obesity (BMI\>95th percentile) * participant must be willing and able to adhere to the assessments, visit schedules, and eating/fasting periods * baseline eating window greater than 12 hours. Exclusion Criteria: * diagnosis of Prader-Willi Syndrome, brain tumor, or diabetes serious intellectual disability * previous diagnosis or subthreshold symptoms of an eating disorder (anorexia nervosa, bulimia nervosa, binge-eating disorder) * parent/guardian-reported physical, mental of other inability to participate in the assessments * previous bariatric surgery * current participation in other interventional weight loss studies.