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

Who May Qualify: - 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. Who Should NOT Join This Trial: - 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. Always talk to your doctor about whether this trial is right for you.