Which substances are considered the preferred fuel sources of the body?

The preferred fuel sources of the body are fatty acids and glucose. Glucose, which is derived from carbohydrates, serves as the primary energy source for the body's cells, especially in the brain and muscles during intense activity. It is efficiently utilized for immediate energy needs and can also be stored as glycogen in the liver and muscles for future use.

Fatty acids, on the other hand, provide a significant amount of energy during rest and low-intensity activities. They are burned more slowly than glucose but yield more energy per gram, making them an essential fuel source during extended periods of exercise or when carbohydrate stores are low.

Together, fatty acids and glucose form a versatile energy system, allowing the body to adapt its fuel use based on activity level, dietary intake, and metabolic needs. This adaptability is crucial for overall health and athletic performance, ensuring the body has access to the energy it needs for a variety of physical demands.