Calories might matter when it comes to losing “weight” but not when it comes to losing strictly fat. This is because without carbohydrates we keep insulin down and prevent fat storage. But more importantly, we promote fat burning, since low insulin means high glucagon – the hormone that grabs fat from storage to burn as fuel.
For example, a 2003 randomized controlled trial from the Journal of Pediatrics took overweight adolescent boys and put them on a low fat or low carb eating plan for 12 weeks. The low carbohydrate group not only lost TWICE as much weight (19lbs vs. 8.5lbs) but they averaged 700 MORE calories per day.