All of these eating plans work on the scientific principles that our metabolism slows down when we eat the same thing day in and day out. The body holds on to body fat stubbornly. Calorie shifting involves eating different amounts of calories every day or a set amount for several days in a row followed by a few days of overeating. You adjust your calories between low and high every day or for a series of days. By keeping your body constantly surprised, calorie shifting will spur your body to start burning fat when you cut your calories on those days.
Usually these eating plans will give you a calorie range in which to stay for a set number of days; for example, you might eat 1,000 calories per day for four days and then eat 2,500 calories on the fifth day, and then go back to 1,000. Or, a more popular way of calorie shifting is to adjust the actual range of calories every single day. One day you'll eat 1,000 calories, the next day you'll eat 1,500 calories, the next day 1,200, and so on.
By keeping your body always guessing you never allow your metabolism to become complacent and to adjust. This way you begin to burn up your fat stores on those low calorie days. This is basically the essence of all calorie shifting diets.
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