Carbohydrates are the main source of energy for your body. They come from the starches and sugars in your diet. Although it is possible to survive without directly eating carbohydrates, it is highly recommended that most of your dietary energy should come from carbohydrates. If you do not consume enough carbohydrates, your body will convert proteins into energy to make up for it. Proteins are necessary for growth and maintenance of your body, it is not wise to risk the loss of protein due to a lack of carbohydrates.