Wondering why the "COVID 19" you packed on during the pandemic won't go away no matter how hard you workout? Herman Pontzer, PhD '06, associate professor of evolutionary anthropology and global health at Duke University, says that the problem is in our brains, not our biceps—specifically, the way we understand the relationship between weight and exercise. The author of the bestselling 2021 Book, Burn, Pontzer says that human metabolism evolved over millions of years to defend against weight loss. As a result, the calories we burn every day stay within a fairly narrow range whether we’re gym rats or couch potatoes. This month on Colloquy, the economics of life with evolutionary anthropologist Herman Pontzer.