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“Our metabolic engines were not crafted by millions of years of evolution to guarantee a beach-ready bikini body, to keep us fit, or even necessarily to keep us healthy. Instead, our metabolism has been shaped by the Darwinian directive to survive and reproduce. Rather than keeping us trim (as the armchair engineer’s model of metabolism predicts), our faster metabolism has led to an evolved tendency to pack on more fat than any other ape.”
― Herman Pontzer, Burn: New Research Blows the Lid Off How We Really Burn Calories, Lose Weight, and Stay Healthy

“Organisms that spend their calories unwisely, in the eyes of natural selection, will reproduce less. The next generation will be full of offspring from the careful, strategic spenders—those who were best at acquiring energy, and who allocated those calories most effectively. Since physiology and behavioral tendencies are inherited, these offspring will tend to spend their calories like their parents did.”
― Herman Pontzer, Burn: New Research Blows the Lid Off How We Really Burn Calories, Lose Weight, and Stay Healthy