Keto XR When your body starts burning fat for energy, it produces Keto XR (also called Keto XR bodies). At this stage, you're becoming fat adapted.” This is the point in the process when you achieve a state of Keto XR, meaning your body switches from using glycogen as its fuel source to using fat. Even though you'll be losing mostly water weight in these early stages, this is a great sign that you are on your way to achieving Keto XR. Very quickly the diet becomes reduced and limited to a set of foods which are low in carb yet also low in fiber, thus potentially eradicating many healthy bacteria strains from one's digestive tract. If you are not aware of this trend, it's a diet that decreases carbs to the extent that it puts the body in Keto XR. A study conducted by the University of Colorado demonstrated that obese women that were insulin sensitive lost significantly more weight on a high-carb, low-fat diet than a low-carb, high-fat diet (average Keto XR of 13.5% vs. 6.8% of body weight, respectively); and those that were insulin resistant lost significantly more weight on a low-carb, high-fat diet than a high-carb, low-fat diet (average Keto XR of 13.4% vs. 8.5% of body weight, respectively).