The brain consumes a lot of energy

However, even though social complexity makes the large brain adaptive, growing the brain comes at a great cost. The brain requires more energy than other organs.* It is therefore thought that another form of evolution must occur simultaneously in order to supply the brain with the large amount of energy it needs. What could that other form of evolution be?

■References (Books, papers, Web articles, etc.)
How Humans Evolved (Eighth Edition)  Robert Boyd, Joan B. Silk W. W. Norton & Company; Eighth edition (December 1, 2017)
家族進化論』 第4章・第10節 脳の大きさと生活史の変化  山極寿一 (東京大学出版会、2012)

*In terms of body weight, the modern human brain is only two percent of the entire body. Nevertheless, as much as 20 percent of the basal metabolism when resting is consumed by the brain. Furthermore, in the case of a growing child, 40 to 85 percent of the energy is diverted to the brain.

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The References list of “Evolution of Human Sociality”