The goal of this clinical trial is to learn how exercise and diet quality affect the health of adolescents with obesity. The main questions it aims to answer are: * Does exercise improve cardiometabolic health in adolescents with obesity? * Does enriching the diet with fruits and vegetables improve cardiometabolic health in adolescents with obesity? * Do exercise and a fruit and vegetable diet together provide greater health benefits than either one alone in adolescents with obesity? Researchers will compare four groups to see how exercise and diet impact health: * Standard Care Group: Receives the usual care for obesity. * Exercise Group: Receives weekly exercise coaching and participates in a 12-week exercise program. * Diet Group: Receives weekly dietary coaching and eats a diet enriched with fruits and vegetables for 12 weeks. * Combined Exercise and Diet Group: Receives both exercise and dietary programs, namely weekly exercise and dietary coaching, participation in a 12-week exercise program, and daily consumption of fruits and vegetables for 12 weeks. During the 12-week study, participants will attend three study visits to: * Provide blood, stool, and urine samples. * Answer questions about health, sleep, diet, and physical activity. * Undergo body scans to measure fat, lean, and bone mass. * Complete blood vessel function and liver fat content assessments. * Assess resting exergy expenditure. * Complete fitness tests. * Wear a fitness tracker to monitor physical activity and sleep patterns.
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Group differences in composite score of cardiometabolic health changes over time.
Timeframe: Baseline, 6 weeks, and 12 weeks.