What is the primary function of fats in the diet?

Fats play a critical role in providing energy to the body. They are one of the three macronutrients, alongside carbohydrates and proteins, that deliver calories, which are essential for bodily functions. When metabolized, fats yield approximately 9 calories per gram, making them the most concentrated source of energy available in the diet.

In addition to energy provision, fats are also important for supporting the absorption of fat-soluble vitamins (A, D, E, and K), contributing to the structural integrity of cell membranes, and serving as a source of essential fatty acids that the body cannot synthesize on its own. While fats do have these additional roles, their primary function remains energy supply, especially during prolonged physical activity when carbohydrate stores are depleted.