The most important thing about exercise is that it be practiced regularly and that it be practiced in accompaniment with a healthy diet. It is also desirable to practice more that one sport as different sports exercise different areas of the body. Carbohydrates, proteins, and fats are the sources of energy for the body. The contained energy is expressed in calories. There are 9 calories per gram in fat and there are about 4 calories per gram in proteins and carbohydrates .
Carbohydrates are the main source of energy for the body.
This energy is mostly used for muscle movement and digestion of food. The energy in carbohydrates is almost instantly digested. This results in a quick rise in blood sugar which is soon followed by a drop in blood sugar which is interpreted by the body as a craving for more sugars. This sugar low may also result in fatigue, dizziness, nervousness, and headache. However, not all carbohydrates do this.