How many calories are defined by one gram of fat?

One gram of fat is defined as providing 9 calories of energy. This value is based on the energy density of fats compared to carbohydrates and proteins. Fats are the most calorie-dense macronutrient, which means they provide more energy per gram than carbohydrates and proteins, each of which provides 4 calories per gram.

Understanding this concept is crucial in fields such as nutrition, dietetics, and health, as it helps in meal planning and understanding energy balance. The distinction between the calorie content of fats compared to other macronutrients informs dietary recommendations and nutritional guidelines. Thus, knowing that one gram of fat equals 9 calories is essential for anyone studying or working in health-related fields.