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Big Brains and Fat Bodies
Fat is crucial for supporting the energy demands of a growing infant's brain, which consumes a significant portion of the body's metabolic energy. Human infants are born with about 15% body fat, significantly higher than other species, to ensure a constant supply of energy for the brain. As the infant's brain grows rapidly in the first few years of life, its body fat levels decrease, illustrating a trade-off between fat storage and brain growth. This highlights the intimate connection between big brains and fat bodies in human development.