What is the energy value of 1g of fat?

The energy value of 1 gram of fat is typically around 37 kJ. This figure is derived from the understanding that fats are denser in energy compared to carbohydrates and proteins, which only provide about 17 kJ and 16 kJ per gram, respectively. Fats serve as a vital source of energy for the body, particularly during periods of rest and low-intensity exercise, due to their high energy density.

In nutrition, understanding the caloric contribution of various macronutrients is essential for calculating dietary energy intake and for planning balanced diets. The significantly higher energy value of fat compared to carbohydrates and proteins highlights why fats are often referred to as a concentrated energy source.