Carbohydrates are the perfect source of energy for the body. They can be converted much more easily (than proteins or fats) into glucose. Which is the form of sugar transported and used by the body.
Carbohydrates are often thought as the primary source of energy for the body. However, this isn’t strictly true. It depends on what the body is doing to determine the best energy source. During normal daily activities, both fats and carbohydrates contribute significantly to the energy requirements. As activity intensity may increase, the contribution of fats decreases and carbohydrates do become the main energy source.