How many calories per gram do fats supply?

Fats provide a significant amount of energy, supplying 9 calories per gram. This high caloric density is due to the chemical structure of fats, which contain long fatty acid chains that hold more energy compared to carbohydrates and proteins, which provide only 4 calories per gram.

The distinction in energy supply is important for understanding dietary needs and the role of fats in nutrition. Fats are essential for various bodily functions, including hormone production and absorption of fat-soluble vitamins (A, D, E, and K). Additionally, they serve as a concentrated energy source, making them vital for athletes and individuals engaged in high-energy activities.

In contrast to the other options, which do not accurately reflect the caloric content attributed to fats, the correct answer emphasizes the efficiency and importance of fats in a well-rounded diet.