16 Aug 2021 --- A new, large-scale study suggests the body’s metabolism – the rate at which it burns calories – peaks earlier and declines later than previously believed. The findings underscore the vital importance of nutrition during infancy – the time when the body’s metabolism is at its highest. “Some people think of their teens and 20s as the age when their calorie-burning potential hits its peak,” says Dr. Peter Katzmarzyk, who collaborated on the international study. He is the associate executive director for population and public health sciences at Pennington Biomedical Research Center in the US.