The human body's primary source of energy is glucose, a simple sugar derived from carbohydrates in the food we consume. Carbohydrates, found in foods like bread, pasta, fruits, and vegetables, are broken down during digestion to release glucose, which enters the bloodstream. Once in the bloodstream, glucose can be used immediately for energy or stored in the liver and muscles in the form of glycogen for later use. This energy powers various bodily functions, from cellular processes to physical activities. Maintaining balanced glucose levels is crucial, as both insufficient and excessive glucose can lead to health issues.