What is the primary source of the body's energy?

The primary source of the body's energy is glucose, which is a simple sugar that is derived from carbohydrates in the food we consume. When we eat foods rich in carbohydrates—such as bread, rice, pasta, fruits, and vegetables—our body breaks them down through digestion into glucose.

This glucose enters the bloodstream and is delivered to cells throughout the body, where it can be used for immediate energy or stored for later use in the form of glycogen in the liver and muscles. Additionally, fat can also serve as a significant energy source, especially during prolonged physical activity or fasting when glucose levels are low.

Proteins can be used for energy as well, but this is generally a secondary source, as proteins are primarily required for growth and repair of tissues rather than energy production. Therefore, while the body can utilize different macronutrients for energy, carbohydrates, particularly in the form of glucose, are the central players in providing immediate energy needs for the body's functions.