The body’s main source of energy is glucose, a simple sugar that is derived from carbohydrates in the foods we eat. When we consume carbohydrates, our bodies break them down into glucose, which is then transported through the bloodstream to cells where it is either used immediately for energy or stored for later use.
This stored form of energy is held in the muscles and liver as glycogen. When the body requires energy, such as during physical activity or between meals, it can convert glycogen back into glucose to meet its energy needs. In addition to carbohydrates, the body can also derive energy from fats and, to a lesser extent, proteins, especially during prolonged periods of fasting or intense exercise. However, glucose from carbohydrates is the preferred and most readily available source of energy under normal circumstances.