and one other thing most important to any weight loss plan..the way to sustained weight loss *( and incidently to decreasing your odds of type 2 diabetes and maximizing your bone density and lowering cholesterol etc) is to increase your core lean body mass..in other words more muscle less fat. This is true for ADULTS...silkie mate there is more than enough time in the future for worrying bout this...you are young...enjoy yourself and stop worrying bout this stuff...plenty of time for that when you are old like us!