If you join this study, you will come to 4 study visits at Children's Hospital Colorado over the course of 1 year. Two study visits will happen right when you join the study, and the other two visits will be 1 year later. At these study visits we will do a physical exam and have you fill out surveys about your health. We will ask you to drink a sugary drink and then use a needle in your arm to take blood samples. We will use an ultrasound to take pictures of your head, neck, and arm. We will ask you to ride a stationary bike to see how your body reacts to exercise. We will also use a machine to measure the strength of your bones. If you join this study, you will be paid $100 per visit, which adds up to a total of $400 over a year.

Who can Participate

You may be able to join this study if you are a girl between the ages of 13 and 16. You must not be using hormonal birth control to join this study.

Study ID