The carb trick, also known as carb cycling, is a way in which you go back and forth between high-carb days and low-carb days. You will eat two days "on" carbohydrates, two days "off" carbs, and two days "medium carbs," and this combination causes your insulin response to kick in and burn fat. Essentially, you will eat two days "on" carbs, two days "off" of carbs, and two days "medium carbs."