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Why We Get Sick: The New Science of Darwinian Medicine

Book by Randolph M. Nesse · 17 quotes · Evolution, History, Life

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Why We Get Sick: The New Science of Darwinian Medicine Quotes

“Pain and fear are useful, and people who lack them are seriously handicapped. As noted already, the rare individuals who are born without the sense of pain are almost all dead by age thirty. If there are people born without the capacity for fear, you might well look for them in the emergency room or the morgue. We need our pains and our fears. They are normal defenses that warn us of danger. Pain is the signal that tissue is being damaged. It has to be aversive to motivate us to set aside other activities to do whatever is necessary to stop the damage. Fear is a signal that a situation may be dangerous, that some kind of loss or damage is likely, that escape is desirable.”

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“We can also, more than any other species, protect ourselves from being poisoned by learning about how to avoid it. Only we can read about the dangerous plants in our gardens and woodlands, and we are the the species whose diets are most shaped by social learning. A food our mothers fed us can usually be accepted as safe and nourishing. What our friends eat without apparent harm is at least worth a try. What they avoid we would be wise to treat cautiously.”

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“People are not controlled by some internal calculator that crudely motivates them to maximize their reproductive success. Instead, people form deep, lifelong emotional attachments and experience loves and hates that shape their lives. They have religious beliefs that guide their behavior, and they have idiosyncratic goals and ambitions. They have networks of friends and relatives.”

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“During most all of human evolution, it was adaptive to conserve energy by being lazy as circumstances permitted. Energy was a vitally needed resourse and could not be wasted. Today this take-it-easy adaptation may lead us to watch tennis on television when we would be better off playing it. This can only aggravate the effects of excess nutrition. The average office worker would be much more healthy if he or she spent the day digging clams or harvesting fruit in scattered tall trees.”

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“Except for professional athletes, dancers, cowboys, and a few other groups, most people in modern industrial societies have abnormally low energy expenditures. Workers sitting in swivel chairs or in driver's seats of cars or even pushing vacuum cleaners or electrically powered lawn mowers are being sedentary, and their leisure hours may be even more so.”

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“Our dietary problems arise from a mismatch between the tastes evolved for Stone Age conditions and their likely effects today. Fat, sugar, and salt were in short supply through nearly all of our evolutionary history. Almost everyone, most of the time, would have been better off with more of these substances, and it was consistenly adaptive to want more and try to get it. Today most of us can afford to eat more fat, sugar, and salt than is biologically adaptive, more than would ever have been available to our ancestors of a few thousands years ago.”

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“Just as the capacity for experiencing fatigue has evolved to protect us from overexertion, the capacity for sadness may have evolved to prevent additional losses. Maladaptive extremes of anxiety, sadness, and other emotions make more sense when we understand their evolutionary origins and normal, adaptive functions.”

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“Emotional capacities are shaped by situations that occurred repeatedly in the course of evolution and that were important to fitness. Attacks by predators, threats of exclusion from the group, and opportunities for mating were frequent and important enough to have shaped special patterns of preparedness, such as panic, social fear, and sexual arousal. Situations that are best avoided shape aversive emotions, while situations that involve opportunity shape positive emotions.”

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“Depression may seem completely useless. Even apart from the risk of suicide, sitting all day morosely staring at the wall can't get you very far. A person with severe depression typically loses interest in everything -work, friends, food, even sex. It is as if the capacities for pleasure and initiative have been turned off. Some people cry spontaneously, but others are beyond tears. Some wake every morning at 4 A.M. and can't get back to sleep; others sleep for twelve or fourteen hours per day. Some have delusions that they are impoverished, stupid, ugly, or dying of cancer. Almost all have low self-esteem. It seems preposterous even to consider that there should be anything adaptive associated with such symptoms. And yet depression is so frequent, and so closely related to ordinary sadness, that we must begin by asking if depression arises from a basic abnormality or if it is a dysregulation of a normal capacity.”

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“Some cues -for instance, snakes, spiders, and heights- readily elicit fear in ourselves and other primates. It should not surprise us to discover that we instinctively avoid certain cues that have long been associated with such dangers as falling and dangerous animals.”

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