Loss of energy, weak muscles, fatigue are all the symptoms of deficiency of carbohydrates.
Low energy levels, fatigue, weak muscles are all the signs of low intake of carbohydrates. Taking very little or no carbohydrates in the diet will lead the body to switch to another fuel source in the body. In such cases, the body starts utilizing proteins and fats. When proteins are utilized, all muscles including muscles of the heart becomes weak.