Dietary fats serve several essential functions in the body, including energy storage, nutrient absorption, and hormone production. They provide a concentrated source of energy, supplying about nine calories per gram, and are crucial for absorbing fat-soluble vitamins such as A, D, E, and K. Additionally, dietary fats play a role in cell membrane structure and integrity, allowing cells to function effectively. Healthy fats, like monounsaturated and polyunsaturated fats, support overall heart health and can help lower bad cholesterol. Balancing fat intake is vital for maintaining optimal health.