We have all heard of the no or low carb diet, cutting out all breads and anything starchy.  
Does it work?
You may lose a bit of weight in the beginning, but after a while this type of eating only leaves you feeling constantly hungry and tired.
According to the American College of Sports Medicine, 58% of calories should come from carbohydrates.

The science behind the no carb diets:
If the body is not being supplied with enough carbs, the body will start to utilize the stored fats as its energy source, and maintain the body’s blood sugar.
What this diet does not take into account, is that the body NEEDS carbs in order to function properly.  Fat cannot replace it.  Your muscles need carbohydrates to move; they are the primary energy source for basic body function, especially if you are working out quite a bit trying to lose weight, or if you are an athlete.

The important thing to remember is that although the recommended amount of carbs is about 58% of your caloric daily intake, it is really about what type of carbs you are eating.  Eating simple carbohydrates like foods that are high in sugar content, like white bread, bagels, candy, or even a lot of cereals.  If you are eating whole grains, complex carbohydrates, your body receives the the amount of carbohydrates it needs, and it takes more energy for your body to digest them, its a win-win!