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  Foreword

  On March 7, 2009, NASA launched the Kepler space observatory with the goal of discovering earthlike planets orbiting stars in our galaxy. Almost immediately, the data produced by this venture revealed the presence of planets orbiting stars in the “Goldilocks zone,” a term used to describe an ideal distance between a planet and its parent star that is “neither too hot nor too cold”—what scientists have more formally termed the “habitable zone.” By November 2013, the mission scientists concluded that in our galaxy alone there may exist as many as forty billion planets that could support life.

  Applying some clever mathematics to their observations of these planets, the Kepler team learned something surprising: They discovered that planets actually deform the orbits of the very stars around which they revolve. And the denser the planet, the more it affects the orbit of the parent star.

  In 1543, Nicolaus Copernicus challenged the prevailing notion that the earth was the center of the universe. In his publication De Revolutionibus, he presented his observations concluding that the earth actually rotated around the sun. His rejection of geocentrism was ultimately denounced by religious leaders who held to the biblical proclamation of the primacy of the earth. What followed thereafter must surely have been a debate of great intensity, with both sides fervently digging in their heels.

  We now know that these seemingly irreconcilable theories are actually both right and wrong. And this paradox is elegantly resolved by the Kepler observations of distant planets. Like the newly discovered planets, our earth distorts the orbit of a star, our sun. Thus the delineation of master and subordinate becomes blurred. In the mutually distorting dance of sun and earth, each participant influences the other.

  In the pages that follow, you will be exploring the many dances that define our species. Through metaphor and anecdote, science and educated speculation, you will gain a deep understanding of the profound influence that our interactions with our environment have upon charting our destiny as well as our momentary well-being. And you will discover how, like our small planet’s tug on the sun, each of us in turn influences all that surrounds us.

  We humans are a polarized lot. Whether we’re debating the center of celestial movement or the importance of genes versus environmental influence in human development, there is often little common ground. But now we are learning that, like planets and stars, genes and environment influence each other. It has become clear that our lifestyle choices—including food, sleep, exercise, relationships, and even acts of compassion—feed back a constant flow of information to our DNA and actually modify the expression of what had been considered an immutable code. As the science of epigenetics reconciles seemingly disparate theories about our health destiny, we are learning to embrace the notion of the dance and to accept that we must design our lives accordingly.

  Go Wild shows us how we can do just that, by tapping into nature’s design for us. Our genetic array evolved and refined itself over millions of years to manifest health almost perfectly in response to a fairly predictable set of cues from the environment. But we’ve turned the tables on our life code by providing confusing social, nutritional, and chemically toxic signals. Go Wild reveals the depth of our current evolutionary discordance, awakening us to how our lifestyle choices foster maladaptive gene expression and thus pave the way for disease.

  The mission accomplished by this wonderfully empowering book is nothing short of revolutionary. Ratey and Manning provide us with the tools we need to reestablish evolutionary concordance and eliminate the conflict that we have unknowingly created between the boundless potential imparted to each of us and the maladaptive influences that now hinder its manifestation.

  —David Perlmutter, MD

  Introduction

  Go Wild. This title at first might suggest scenes such as college kids run amok on spring break, so it’s fair to ask up front: What do we mean by this? If not college kids, then maybe survivalists foraging on an island? Loinclothed hunters pitching spears at antelope or fleeing lions? We mean nothing nearly so lurid, but you’re getting warmer. “Wild” is one of those overworked words with layers of loaded meanings, but we intend to strip it to its core in order to make it useful—useful even to your own personal well-being.

  Our meaning is easy enough to grasp. Think of wild versus tame, wolf versus dog, bison versus cow. We have the same sort of distinction in mind now when we ask you to expand this with the somewhat revolutionary notion of applying the idea to humans. Wild humans. It’s not as odd as it sounds. In fact, through deep history, through tens of thousands of years, everyone was a wild human. The very same forces that tamed wolves and made them dogs tamed humans. Call these forces civilization, and yes, obvious and abundant benefits came with the deal. We’re not here to dispute those blessings. Our bedrock point has more to do with genes, evolution, and time. Human evolution occurred under wild conditions, and this made us who we are. The modern human still operates on those same genes, almost wholly unchanged. We are designed to be wild, and by living tamely we make ourselves sick and unhappy.

  We are going to tell you a number of fascinating details about that design: that you are born to move with grace, born to embrace novelty and variety, born to crave wide-open spaces, and, above all, born to love. But one of the more profound facts that will emerge is that you are born to heal. Your body fixes itself. A big part of this is an idea called homeostasis, which is a wonderfully intricate array of functions that repair the wear and tear and stress of living. This ability lies at the very heart of what we mean by “going wild.”

  We’re going to make our case by first showing you the real, sweeping, catastrophic consequences of taming. The world’s leading causes of death and suffering—killers like heart disease, obesity, depression, and even cancer—are the price we pay for ignoring our genetic code, our design. But fixing this, especially fixing this on the individual level, in your life, is not as overwhelming as it sounds. That’s where homeostasis comes in. The task at hand is to get out of the way and let your body’s wonderfully evolved abilities for self-repair do their job. The steps are simple and doable, even in our modern world. This is not speculation. Lots of people have taken these steps, including the authors. We’ll tell you about them in detail, but we also have something more planned for you. If you trace these ideas along with us through this book, we think you will come away with a new appreciation for the human condition.

  One of the realizations we hope to deliver is how everything—how you eat, move, sleep, think, and live—is connected. All of it is relevant to your well-being. This seems a simple enough idea, but it flies straight in the face of the fundamentals of Western thought, of science, and especially of modern Western medicine. The tame idea is to break down a problem into components, find out which component is malfunctioning, and fix that problem—an idea that works well enough with machines, but we are not machines. We are wild animals. The wild idea is to embrace complexity.

  The fact is, your depression is not solely a condition of mind and is not isolated in the brain. It may be directly and firmly a fault of your exercise routine or choice of vegetables and protein. Your obesity may be caused by your diet or it may b
e linked to bacteria or lack of sleep—or, even more curiously, your maternal grandmother’s low birth weight. Your failure at your job may be cured by long walks in the mountains with your dog.

  Even the child’s song knows that the leg bone is connected to the thigh bone; we mean to press this idea a lot further to provide some appreciation of the enormous complexity and interconnectedness of the various elements of human life.

  The chapters that follow will begin to assemble the case by breaking down our various topics into subcategories, and some are the usual suspects. We will begin with the basics, by examining diet and then exercise, but that’s not to say we will deliver up the usual advice. Rather, we are going to use some emerging realizations in both of these areas to establish a habit of mind, a method of thinking about the human condition. We’ll build on that case by looking at a broader set of behaviors: sleep, mindfulness, tribalism, relationships, and contact with nature. As the case builds, you will notice a couple of themes. First, it will quickly become apparent that the boundaries of our categories are porous indeed. We will begin talking about nutrition, and suddenly there is a firm, physical link through an identifiable pathway to, say, brain function or the immune system. This is as it should be, because this is the reality.

  But more important, you will also notice that each of these categories is a pathway, and each path leads eventually to the brain and the mind. Of course it does: the mind is the seat of well-being. Which leads us to a set of fundamentally contradictory ideas that will channel what follows. Each of these contradictory ideas is correct in its own way, and each has much to teach us.

  The first of these emerges in a whole slew of statements through the years, but it’s perhaps best stated in a sentence attributed to Native Americans: “Every animal knows way more than you do.” The contradictory statement to this one has a long and robust tradition in Western thought, explicitly articulated even at the very root of the Judeo-Christian tradition: you, as a human, are the crown of creation, better, “more evolved,” and therefore somehow separate from and superior to all other animals.

  Maybe it’s best to hear the first case from a field biologist, because these are often the people who, like traditional Native Americans, truly understand the idea. The act of close observation of a given species of wild animal does nothing so much as instill a deep appreciation for the inherent abilities that attune animals to the environment. The biologist was expressing this very idea to an observer one time when the observer challenged him. “Okay, if owls are so smart, why don’t they build houses, cars, and computers?” The biologist’s instant response was “They’re so smart that they don’t have to.”

  The same idea emerges in a more common event. You don’t have to be a biologist to make a close study of an animal, and many of us do. We study our dogs. And many of us have had the experience of watching the familiar family pet deliver a litter of pups. Being proper dog surrogate parents, we research the coming event as thoroughly as possible. We make trips to the vet, we prepare for the various procedures we will need to follow to ensure each pup’s first breath—there’s a series of defined and specific steps to effect a clean entry into the world: clear obstructions and mucus and then stimulate, stroking gently to encourage those first few magical breaths. We think we have to, because our dog, smart as she may be, has never mothered pups before and has no access to how-to books or the instructions we printed from the Internet. And then the pups come and the supposedly ignorant first-time mother flawlessly executes each complicated step precisely as the instructions specified, and then she looks at us as if to say, “What are you here for?” The dog doesn’t need to read the manual, because every animal knows way more than you do.

  This is an especially important example, because it involves hormones, in this case oxytocin. Dogs have them. So do all animals, including humans, and oxytocin will figure in much of this book—even, in fact, in some surprising areas like business transactions, exercise, and violence.

  But we are not restricted in thinking about instinctive knowledge of well-being in other animals, a statement that lies at the very heart of our argument. Somehow, we have gotten to the point of believing that we must ensure our personal well-being by a series of complicated gyrations and contortions, whole shelves of self-help books, multiple gym memberships, moon-launch-capable gear and telemetry, daily attention to the health section of the newspaper, support groups, and a constant count of calories. Yet imagine for a second a group of Masai men—the storied herders of Kenya—making their way across the Serengeti, an effortless trot of lithe, formed bodies, perfect conditioning, and a beauty and economy of motion that would be the envy of every dedicated gym rat. When do the Masai count calories or read the manuals? Where are their personal trainers? Or, for that matter, how do we explain the apparent well-being of the hunter-gatherer groups so assiduously studied for centuries by anthropologists and universally reported to be fit, thin, and happy? Hunter-gatherers are wild humans. Like every wild animal, they know way more than we do, which flies straight in the face of the crown of creation argument, and we do indeed mean to, at least at first, challenge that notion. Much of the damage that we inflict on ourselves, on others, and certainly on the natural world stems from extreme adherence to the notion of human exceptionalism.

  Nonetheless.

  The jury is still out on the question of whether the human brain is the pinnacle, the best thing evolution has ever done. The experiment has been in progress for only a couple of million years, and we have yet to see all the downsides, although a few are coming clearly into view. However, it is a simple matter of fact (and wonder) that the human brain is the most complicated and profound organ ever. In the early days of thinking about human evolution, or even today, much of what we consider exceptional about our brain is our cognitive abilities: using tools, planning, being clever—that sort of thing. These abilities are marvelous and unique. We don’t mean to understate them here, but it may help to begin thinking about some other abilities as well. For instance, the purpose of all brains—not just ours, but in all sentient beings—is to allow movement, locomotion, coordination, and manipulation. We’re exceptionally good at these skills as well.

  Yet our cleverness, recall, learning, and grasp of fact are not all that complex as brain functions go. It turns out—and we know this because of sophisticated tools that measure and assess brain activity—that some activities we take for granted (empathy, language, and everyday social skills) are exceedingly complex; they light up the whole brain, a buzzing glow of unimaginably dense neural networks. This is what we do and what no other species can do. We’ll unpack this idea slowly as we go, but know up front that what makes us human is our unprecedented ability to get along with one another. This is our crowning achievement.

  And this is what interests us, but also offers a model or framework for the case we will build in the following chapters. We are going to talk about components of human activity, like diet, sleep, and exercise. But, as we have said, there are important connections among these components. More to the point, each of these activities supports the brain. Each of them in meaningful, measurable, tangible, nameable ways supports the brain and the brain’s ability to light up that hypercharged network of neural pathways. These are the neural pathways that sponsor and record your well-being and ultimately your ability to connect to other humans. Light up the whole system, and you will feel better.

  This book builds its case in succeeding chapters along just this path of logic. We’ll begin by laying out a baseline, a summary of what we know about initial conditions and the details of human evolution. What exactly is the human condition and what is human nature? And we’ll make the overarching case, by updating a more-than-century-old inquiry into “diseases of civilization,” that violation of those initial conditions has made us ill. Most of what ails us today are precisely these afflictions: diseases of civilization. Then in successive chapters we’ll look at the subsets of human activity: diet and exercise, sle
ep, tribalism, contact with nature, relationships, and mindfulness. We’ll then summarize with a chapter of practical advice on the personal level.

  “Wild.” This is the word we need now. Before civilization, everything was wild, including humans. The polite term of anthropology is “hunter-gatherer,” but calling our ancestors “wild” explains so much more. Before there was farming and cities, we were wild humans. Ever since, more and more of us have been tamed, and this is what is making us ill. All that unfolds in the following chapters will be the case for honoring the design of our bodies that evolution gave us, but the easier way to say it is this: Go wild.

  Worldwide, there is a growing and necessary trend toward restoring wild systems via ecological restoration. The Europeans call this process “re-wilding.” We are arguing that the human body is every bit as complex and biodiverse, it turns out, as any wild ecosystem, and like an ecosystem, it works best when restored to wild conditions. So think of this book as instructions for re-wilding your life, and maybe even an introduction to ideas that may change the way you think about life.

  In the beginning, though, it may help you to imagine three scenes. You’ll want to recall them every now and again throughout this book to see how different they appear. Like old-style chemical photo developing, the narrative that follows should reveal more detail in these images as our story unfolds. At first, the images will seem fuzzy and disconnected; if we do our work correctly in the pages to come, they will begin to reveal much about the human condition.

  Here’s one:

  This is a photograph that we encountered years ago but that kept popping into mind as we thought about this project. There’s probably a good reason it persisted, and it must begin with the fact that this is a classic photo of a band of hunter-gatherers recorded in 1947, before encroachment by civilization had compromised their way of life—and civilization did indeed make these people as sick as the rest of us in a very short time. But this is a “before” photo, and it shows a group of San people of Africa’s Kalahari gathered in conversation or, probably more accurately, in storytelling, an activity that has bound us and defined our humanity for longer than we can imagine. The nakedness, of course, strikes us first, but that’s a normal enough state for most of humanity for most of history. But beyond that, notice what the nakedness reveals: the lithe, fit bodies, upright and strong. Count ribs. But then check out the guy telling the story: the animation, the affect, the engagement. See what his face is doing, that he radiates a sort of magnetism that holds the circle together, engaged and involved. Who among us today communicates so well? And the circle itself? Notice that it is mostly children, that it hangs together, almost literally. There is an undeniable and readily apparent bond. There is trust.