Radiantly Slim Also, since there are no carbohydrates to be converted to energy, the body will have no choice but to convert the stored fats in the body to energy. However, Atkins Diet also has its disadvantages. First, it can bring harmful effects to the kidneys. The kidneys are responsible for breaking down proteins. If you are always taking in proteins, the kidneys may be overworked. It can also increase the cholesterol level of a person since it does not limit any fat intake.