A new study suggests children’s metabolism temporarily slows during puberty​ – a pattern that might explain the current teen obesity​ problem. On average, the researchers found, 15-year-olds used about 450 fewer calories at rest each day, compared to when they were 10 years old. The shift is surprising, experts said, since larger bodies usually burn more calories at rest – to fuel brain activity, the cardiovascular system and the other bodily processes that keep us alive. Dr. Scott Kahan, Director of the National Center for Weight and Wellness