1.   Also, because the diet requires low carbohydrate intake, those who practice it deprive themselves of high-fiber foods and essential vitamins, Nicholas says.

2.   Carbohydrate intake later in the day should be simple carbs, Bill says.

3.   High carbohydrate intake increases serotonin production, which in turn facilitates sleep.

4.   Less restrictive than Atkins in carbohydrate intake, as long as all white starches and sugars are avoided.