How many kcal are contained in one gram of fat?

One gram of fat contains 9 kilocalories. This energy value is significant because fat is a macronutrient that provides more than twice the calories per gram compared to carbohydrates and proteins, which each provide approximately 4 kilocalories per gram. The higher energy density of fats makes them an important energy source for the body, especially in contexts such as endurance activities, where sustained energy release is beneficial. Additionally, dietary fats play crucial roles in the absorption of fat-soluble vitamins (A, D, E, K) and are essential for many physiological functions, including cell membrane integrity. Understanding the caloric content of fats aids in making informed dietary choices and managing energy balance.