After three days in a row on low carbohydrates, your glycogen levels will be almost completely depleted. If you were to continue on low carbohydrates for a fourth day, fifth day, or beyond, you would notice your energy and training intensity begin to diminish. You would also notice that your muscles would "flatten out" and become softer. Your metabolic rate would begin to slow down and your thyroid gland would decrease its output of thyroid hormone. Basically, your diet would become less and less effective the longer you stayed on low carbohydrates beyond the three day period. Your body is so "smart," it simply makes changes in physiology and metabolism to compensate for the prolonged lack of carbohydrates (which it interprets as starvation). That's why you have to "shake things up" and keep your body off guard by throwing in a high carbohydrate day every fourth day.
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WHAT IT IS A three-phase plan that has been likened to the low-carbohydrate Atkins program because during the first two weeks, South Beach eliminates most carbs, including bread, pasta, potatoes, fruit and most dairy products. In PHASE 2, healthy carbs, including most fruits, whole grains and dairy products are gradually reintroduced, but processed carbs such as bagels, cookies, cornflakes, regular pasta and rice cakes remain on the list of foods to avoid or eat rarely.