Lori Harder argues that diet, not cardio, determines body composition. Fat loss happens when your body becomes metabolically flexible and can burn stored fat between meals. Once you fix your diet and build metabolic flexibility, staying lean requires minimal extra effort.
80% of our body composition happens as a result of how we choose to eat. We don't lose fat by running or by walking that much. We lose fat when we teach our body to become metabolically flexible so that when we don't eat, we burn off our own stored body fat. We don't need to be eating 3,500 calories a day and then going to the gym and trying to burn off 1,000 of those, you know, to make some equation balance out. Once you get your diet right, once you've achieved this metabolic flexibility, It doesn't take much to be lean and fit and strong and energetic.
