An Acceptance-Based Healthy Lifestyle Intervention for Diverse Adolescents

Inclusion Criteria: * Ages 14-19 * Gender identification as girl * BMI percentile ≥ 85th percentile for sex-and-age Exclusion Criteria: * Experience of weight loss of ≥5% of body weight in the past 6 months for any reason except post-partum weight loss * Having recently begun or changed the dosage of any medication known to affect appetite or body composition within the last 3 months * Plans to move out of the area within the next year * Active cancer or cancer requiring treatment in the past 2 years (except non-melanoma skin cancer) * Active or chronic infections (e.g., HIV or TB) * Active cardiovascular disease or event including hospitalization or therapeutic procedures for treatment of heart disease in the past 6 months * Active kidney disease * History of bariatric surgery * Lung disease: chronic obstructive airway disease requiring use of oxygen (e.g., emphysema or chronic bronchitis) * Diagnosed diabetes (type 1 or 2) * Any condition prohibiting physical activity * Diagnosis of an eating disorder * Have a mental handicap or are currently experiencing other severe psychopathology that would limit their ability to engage in the treatment program (e.g., severe depression, active psychotic disorder) * Recent or ongoing problem with drug abuse, alcohol abuse, or addiction * Currently pregnant or less than 3 months post-partum * Anticipation of a possible pregnancy in the next year * Unwillingness to report possible or confirmed pregnancies promptly during the course of the trial