April 16, 2007 — -- Jim Karas is a New York Times bestselling author and weight loss expert. In "The Cardio-Free Diet," Karas shares why, according to him, cardiovascular exercise alone won't ...

Duke’s Herman Pontzer, PhD., says we can’t lose weight from exercise alone in his new book, “Burn.” Pontzer argues that even our understanding of ideal caloric intake is wrong-headed.