The main molecules responsible for cellular energy are the molecules of carbohydrates and fats.
Carbohydrates are the main source of energy for the body. If the consumption of carbohydrates is excessive, they will be stored in the form of glycogen. Glycogen is a form of glucose that is stored as an energy reserve. Glucose is stored in the liver.
After glycogen, the second source of energy reserves is lipids, or what is commonly known by the public as fat. Fat is also a source of energy. Then the last source of energy reserves is protein.
When the availability of glucose is running low, fat will be formed before it is broken down. Fat has begun to be used by the body as a source of energy when the availability of glucose remains half. Only after the fat is used up, the body will ask for protein to act as the last energy reserve source. So, glucose is broken down first, then fat is second, and protein is third.
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