What is the major energy source in human milk?

The major energy source in human milk is fat. Lipids, primarily in the form of triglycerides, account for approximately 45-55% of the total energy content of human milk. These fats are essential for providing the necessary calories for the infant's growth and development. They also play a crucial role in the absorption of fat-soluble vitamins (A, D, E, and K) and the provision of essential fatty acids, such as linoleic acid and alpha-linolenic acid, which cannot be synthesized by the human body and must be obtained from the diet.