How many calories are contained in one gram of fat?

One gram of fat contains 9 calories. This value is well established in nutritional science and serves as a fundamental basis for understanding macronutrient energy contributions. Fats are denser in energy compared to carbohydrates and proteins, which provide 4 calories per gram. The higher caloric content of fat is a key reason it is often linked with energy storage in the body, as it provides a substantial source of fuel during prolonged periods of physical activity or energy deficits. Understanding this caloric difference is essential for those studying nutrition or pursuing certifications in personal training, as it affects dietary planning and energy balance considerations for clients.