Which macronutrient provides the most energy per gram?

Fat is the macronutrient that provides the most energy per gram, offering approximately 9 calories per gram. This makes it more energy-dense than carbohydrates and protein, which each provide about 4 calories per gram. While fiber is also categorized with carbohydrates and is beneficial for digestion, it typically does not provide usable energy in the same manner as other carbohydrates. The high caloric content of fat plays a crucial role in energy balance and serves as a key component in many dietary plans, especially for those looking to increase overall caloric intake or support specific energy needs during intense physical activity or training. Understanding the energy density of fats is essential for nutrition planning, particularly in the context of sports and exercise performance.