What role do fats play in the body?

Fats are primarily known for their role as a source of stored energy in the body. They serve as a significant energy reserve, providing more than double the energy per gram compared to proteins and carbohydrates. This energy is released through metabolic processes when the body requires fuel, especially during prolonged physical activities or periods of fasting. Additionally, fats are essential for the absorption of fat-soluble vitamins (A, D, E, and K) and play a vital role in cellular structure and function as they are key components of cell membranes.

While fats can participate in various bodily functions, they do not typically increase metabolic rates directly; that function is more associated with muscle mass and the thermic effect of food. Bone health is influenced more by minerals like calcium and phosphorus, along with vitamin D, rather than directly by fat intake. As for oxygen transport, hemoglobin and other proteins in red blood cells are primarily responsible for this function, not fats. Therefore, recognizing fats' primary role as a source of stored energy is critical in understanding their importance in nutrition and metabolism.