Missing Microbes: How the Overuse of Antibiotics Is Fueling Our Modern Plagues [NOOK Book]

Overview


A critically important and startling look at the harmful effects of overusing antibiotics, from the field's leading expert

Tracing one scientist’s journey toward understanding the crucial importance of the microbiome, this revolutionary book will take readers to the forefront of trail-blazing research while revealing the damage that overuse of antibiotics is doing to our health: contributing to the rise of obesity, asthma, diabetes, and certain forms of cancer. In Missing ...

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Missing Microbes: How the Overuse of Antibiotics Is Fueling Our Modern Plagues

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Overview


A critically important and startling look at the harmful effects of overusing antibiotics, from the field's leading expert

Tracing one scientist’s journey toward understanding the crucial importance of the microbiome, this revolutionary book will take readers to the forefront of trail-blazing research while revealing the damage that overuse of antibiotics is doing to our health: contributing to the rise of obesity, asthma, diabetes, and certain forms of cancer. In Missing Microbes, Dr. Martin Blaser invites us into the wilds of the human microbiome where for hundreds of thousands of years bacterial and human cells have existed in a peaceful symbiosis that is responsible for the health and equilibrium of our body. Now, this invisible eden is being irrevocably damaged by some of our most revered medical advances—antibiotics—threatening the extinction of our irreplaceable microbes with terrible health consequences. Taking us into both the lab and deep into the fields where these troubling effects can be witnessed firsthand, Blaser not only provides cutting edge evidence for the adverse effects of antibiotics, he tells us what we can do to avoid even more catastrophic health problems in the future.

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Editorial Reviews

Library Journal
★ 06/01/2014
Considering our current obsession with antibacterial hand sanitizers and other cleanliness rituals, most people probably do not realize—or, frankly, want to know—that 90 percent of a human's cells are actually bacteria. That fact poses questions that challenge basic assumptions: Does that mean we are coexisting with these microbes? But aren't bacteria the enemy? Infectious disease specialist Blaser, who directs the Human Microbiome Program at New York University and founded the Bellevue Literary Review, has spent a lifetime studying bacteria and antibiotics and drawn some mind-bending conclusions—namely, that antibiotics may be increasing chronic health problems such as obesity, asthma, autism, and cancer. He takes the reader through the discovery of antibiotics, which have indeed saved millions of lives, and describes the unforeseen consequences of their overuse. He also describes a parallel line of scientific research delving into "good" bacteria and the complicated relationship between these life-forms and human health. VERDICT Blaser explains even the most complicated scientific and medical concepts with straightforward clarity. Most important, he makes a case for why readers, whatever their background, absolutely need to care about society's overuse and misuse of antibiotics. [See Prepub Alert, 10/21/13.]—Marianne Stowell Bracke, Purdue Univ. Lib., West Lafayette, IN
From the Publisher
"An engrossing examination of the relatively unheralded yet dominant form of life on Earth." —-Publishers Weekly Starred Review
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Product Details

  • ISBN-13: 9780805098112
  • Publisher: Holt, Henry & Company, Inc.
  • Publication date: 4/8/2014
  • Sold by: Macmillan
  • Format: eBook
  • Pages: 288
  • Sales rank: 28,129
  • File size: 669 KB

Meet the Author


Dr. Martin Blaser has studied the role of bacteria in human disease for over 30 years. He is the director of the Human Microbiome Program at NYU. He founded the Bellevue Literary Review and has been written about in newspapers including The New Yorker, Nature, The New York Times, The Washington Post, and The Wall Street Journal. His more than 100 media appearances include The Today Show, GMA, NPR, the BBC, The O’Reilly Factor, and CNN. He lives in New York City.
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Read an Excerpt


1.

Modern Plagues

I never knew two of my father’s sisters. In the little town where they were born, early in the last century, they didn’t see their second birthdays. They had high fevers, and I am not sure what else. The situation was so dire that my grandfather went to the prayer house and changed his daughters’ names to fool the angel of death. He did this for each girl. It did no good.

In 1850, one in four American babies died before his or her first birthday. Lethal epidemics swept through crowded cities, as people were packed into dark, dirty rooms with fetid air and no running water. Familiar scourges included cholera, pneumonia, scarlet fever, diphtheria, whooping cough, tuberculosis, and smallpox.

Today, only six in every thousand infants in the United States are expected to die before age one—a remarkable improvement. Over the past century and a half, our nation and other countries in the developed world have been getting healthier. Chalk it up to improved sanitation, rat control, clean drinking water, pasteurized milk, childhood vaccinations, modern medical procedures including anesthesia, and, of course, nearly seventy years of antibiotics.

In today’s world, children grow up without the deformed bones caused by lack of vitamin D or “cloudy” sinuses from infections. Nearly all women survive childbirth. Eighty-year-olds, once consigned to the veranda, are swatting tennis balls, often with the help of a metal hip joint.

Yet recently, just within the past few decades, amid all of these medical advances, something has gone terribly wrong. In many different ways we appear to be getting sicker. You can see the headlines every day. We are suffering from a mysterious array of what I call “modern plagues”: obesity, childhood diabetes, asthma, hay fever, food allergies, esophageal reflux and cancer, celiac disease, Crohn’s disease, ulcerative colitis, autism, eczema. In all likelihood you or someone in your family or someone you know is afflicted. Unlike most lethal plagues of the past that struck relatively fast and hard, these are chronic conditions that diminish and degrade their victims’ quality of life for decades.

The most visible of these plagues is obesity, defined in terms of the body mass index (BMI), which expresses the relationship between a person’s height and weight. People of healthy weight have a BMI between 20 and 25. Those whose BMI is between 25 and 30 are overweight. Everyone with a BMI over 30 is obese. Barack Obama has a BMI of about 23. The BMIs of most U.S. presidents have been under 27, except for that of William Howard Taft, who once got stuck in the White House bathtub. He had a BMI of 42.

In 1990, about 12 percent of Americans were obese. By 2010, the national average was above 30 percent. Next time you go to an airport terminal, supermarket, or mall, look around and see for yourself. The obesity epidemic is not just a U.S. problem; it’s global. As of 2008, according to the World Health Organization (WHO), 1.5 billion adults were overweight; of these, over 200 million men and nearly 300 million women qualified as obese. Many of these people live in developing countries that we associate more with famine than with overeating.

These figures are alarming, but the really shocking fact is that this accumulation of global human body fat has been accelerating not over the course of a few centuries but in a mere two decades. Yet fat- and sugar-rich foods, so often blamed for all the extra pounds, have been ubiquitous for a good deal longer than that, at least in the developed world, and the new generations of overweight people in the third world have not suddenly adopted a Kentucky-fried American-style diet. Epidemiologic studies have shown that high caloric intake, while definitely not helpful, is not sufficient to explain the distribution or course of the worldwide obesity epidemic.

At the same time, the autoimmune form of diabetes that begins in childhood and requires insulin injections (juvenile or Type 1 diabetes) has been doubling in incidence about every twenty years across the industrialized world. In Finland, where record keeping is meticulous, the incidence has risen 550 percent since 1950. This increase is not because we are detecting Type 1 diabetes more readily. Before insulin was discovered in the 1920s, the disease was always fatal. Nowadays, with adequate treatment, most children survive. But the disease itself has not changed; something in us has changed. Type 1 diabetes is also striking younger children. The average age of diagnosis used to be about nine. Now it is around six, and some children are becoming diabetic when they are three.

The recent rise in asthma, a chronic inflammation of the airways, is similarly alarming. One in twelve people (about 25 million or 8 percent of the U.S. population) had asthma in 2009, compared with one in fourteen a decade earlier. Ten percent of American children suffer wheezing, breathlessness, chest tightness, and coughing; black children have it worst: one in six has the disease. Their rate increased by 50 percent from 2001 through 2009. But the rise in asthma has not spared any ethnicity; the rates were initially different in various groups, and all have been rising.

Asthma is often triggered by something in the environment such as tobacco smoke, mold, air pollution, cockroach leavings, colds, and flu. Once an attack begins, asthmatics gasp for air and, without quick medication, are rushed to emergency rooms. Even with the best care, they can die, as did the son of a physician colleague. No economic or social class has been spared.

Food allergies are everywhere. A generation ago, peanut allergies were extremely rare. Now, if you stroll through any preschool, you will see walls plastered with “nut-free zone” bulletins. More and more children suffer immune responses to proteins in foods, not just in nuts but in milk, eggs, soy, fish, fruits—you name it, someone is allergic to it. Celiac disease, an allergy to gluten, the main protein in wheat flour, is rampant. Ten percent of children suffer from hay fever. Eczema, a chronic skin inflammation, affects more than 15 percent of children and 2 percent of adults in the United States. In industrialized nations, the number of kids with eczema has tripled in the past thirty years.

These disorders suggest that our children are experiencing levels of immune dysfunction never seen before, as well as conditions such as autism, a much discussed and debated modern plague that is a focus of my laboratory. Nor are adults escaping their own share of modern plagues. The incidence of inflammatory bowel disease, including Crohn’s and ulcerative colitis, is rising, wherever we look.

When I was a medical student, esophageal reflux, which causes heartburn, was uncommon. But the ailment has exploded in these past forty years, and the cancer it leads to, adenocarcinoma of the esophagus, is the most rapidly increasing cancer in the United States and everywhere else it has been tracked, and is a particularly nasty problem for Caucasian men.

■■■

Why are all of these maladies rapidly rising at the same time across the developed world and spilling over into the developing world as it becomes more Westernized? Can it be a mere coincidence? If there are ten of these modern plagues, are there ten separate causes? That seems unlikely.

Or could there be one underlying cause fueling all these parallel increases? A single cause is easier to grasp; it is simpler, more parsimonious. But what cause could be grand enough to encompass asthma, obesity, esophageal reflux, juvenile diabetes, and allergies to specific foods, among all of the others? Eating too many calories could explain obesity but not asthma; many of the children who suffer from asthma are slim. Air pollution could explain asthma but not food allergies.

Many theories have been proposed to explain each disorder: lack of sleep makes you fat; vaccines lead to autism; genetically engineered wheat strains are toxic to the human gut; and so on.

The most popular explanation for the rise in childhood illness is the so-called hygiene hypothesis. The idea is that modern plagues are happening because we have made our world too clean. The result is that our children’s immune systems have become quiescent and are therefore prone to false alarms and friendly fire. A lot of parents these days try to ramp up their kids’ immune systems by exposing them to pets, farm animals, and barnyards or better still by allowing them to eat dirt.

I beg to differ. To me, such exposures are largely irrelevant to our health. The microbes present in dirt have evolved for soil, not for us. The microbes in our pets and farm animals also are not deeply rooted in our human evolution. The hygiene hypothesis, as I will show you, has been misinterpreted.

Rather we need to look closely at the microorganisms that make a living in and on our bodies, massive assemblages of competing and cooperating microbes known collectively as the microbiome. In ecology, biome refers to the sets of plants and animals in a community such as a jungle, forest, or coral reef. An enormous diversity of species, large and small, interact to form complex webs of mutual support. When a keystone species disappears or goes extinct the ecology suffers. It can even collapse.

Each of us hosts a similarly diverse ecology of microbes that has coevolved with our species over millennia. They thrive in the mouth, gut, nasal passages, ear canal, and on the skin. In women, they coat the vagina. The microbes that constitute your microbiome are generally acquired early in life; surprisingly, by the age of three, the populations within children resemble those of adults. Together, they play a critical role in your immunity as well as your ability to combat disease. In short, it is your microbiome that keeps you healthy. And parts of it are disappearing.

The reasons for this disaster are all around you, including overuse of antibiotics in humans and animals, Cesarian sections, and the widespread use of sanitizers and antiseptics, to name just a few. While antibiotic resistance is a huge problem—old killers like tuberculosis are increasingly resistant and making a comeback—there now seem to be separate ones, affecting people with such scourges as Clostridium difficile (C. diff), bacteria of the digestive tract resistant to multiple antibiotics, a potential danger in the hospital, and a spreading pathogen, methicillin-resistant Staphylococcus aureus (MRSA), which can be acquired anywhere. The selective pressure of antibiotic use is clearly increasing their presence.

But as terrible as these resistant pathogens are, the loss of diversity within our microbiome is far more pernicious. Its loss changes development itself, affecting our metabolism, immunity, and cognition.

I have called this process the “disappearing microbiota.” It’s a funny term that does not immediately roll off your tongue, but I believe it is correct. For a number of reasons, we are losing our ancient microbes. This quandary is the central theme of this book. The loss of microbial diversity on and within our bodies is exacting a terrible price. I predict it will be worse in the future. Just as the internal combustion engine, the splitting of the atom, and pesticides all have had unanticipated effects, so too does the abuse of antibiotics and other medical or quasi-medical practices (e.g., sanitizer use).

An even worse scenario is headed our way if we don’t change our behavior. It is one so bleak, like a blizzard roaring over a frozen landscape, that I call it “antibiotic winter.” I don’t want the babies of the future to end up like my poor aunts. That is why I am sounding an alarm.

■■■

My personal journey toward the realization that our friendly microbes are in trouble began on July 9, 1977. I remember the date because it was the first time I heard the name of a microbe, Campylobacter, that literally set my life’s research into motion. I was a newly minted fellow in infectious diseases at the University of Colorado Medical Center in Denver.

That morning I was asked to see a thirty-three-year-old patient who had come to the hospital a few days earlier. He had been suffering from a high fever and was confused. A spinal tap confirmed that he had meningitis, a serious inflammation of the nervous system. His doctors sent samples of his blood and spinal fluid to the culture lab to determine whether the cause was a bacterial infection and, if so, to find out what kind of bacterium it was. While those tests were pending, they started him on antibiotics anyway because he looked quite ill. They believed that he needed big doses of antibiotics immediately or he would die. They were correct.

The test results revealed a slow-growing bacterium identified as Campylobacter fetus, an organism that no one at the hospital had ever heard of. That’s why I was called. On the job for nine whole days, I was supposed to know the answers.

Campylobacter organisms are a genus of spiral-shaped bacteria. Like that of so many tiny corkscrews, their helical shape helps them penetrate the gelatin-like mucus that lines the gastrointestinal tract. But why the odd species name fetus? (In biology, each organism is identified first by the name of its genus, in this case Campylobacter, and then by its species, in this case fetus. Each genus has many species and subspecies. Humans are Homo sapiens: of the genus Homo and the species sapiens.) Digging into the medical literature, I discovered that the microbe had this strange name because it affected pregnant sheep and cattle, causing them to abort. It rarely infected humans. How our patient got infected was a mystery. He was a city man, a musician.

Once we knew the organism, we tailored an appropriate antibiotic treatment, and the patient recovered in a couple of weeks. Meanwhile, I was scheduled to give a talk at a clinical conference and decided I would speak about Campylobacter. What could be better than talking about a rare infection that no one knew anything about? My own ignorance as a novice would go undetected.

In reading more about Campylobacter fetus, I soon learned it has a cousin, Campylobacter jejuni. (The jejunum is part of the small intestine.) The literature, scanty as it was, suggested that people infected by C. fetus usually have bloodstream infections, whereas those invaded by C. jejuni tend to have diarrheal illnesses. Here were two nearly identical organisms with very different effects on the body. Why would one Campylobacter stay trapped in the gut, where it kind of belonged, while the other escaped like a ninja into the bloodstream? I was hooked.

Over the next several years, moving from academia to the Centers for Disease Control and back to academia (University of Colorado and Vanderbilt), I became an expert in C. fetus, my “favorite” bacterium, and discovered some secrets about its Houdini-like nature.

In this respect, C. fetus played an early role in the evolution of my disappearing microbiome hypothesis by teaching me fundamental lessons about how bacteria can persist in their hosts. Yes, they cause disease but, as I later came to appreciate more fully, there also are bacteria that live in us, using a variety of similar tools to escape our immune system. They usually don’t harm us; rather, they protect us. I learned that bacteria employ countless tricks, honed from millions of years of trial and error, to do their business, which might either help or hurt their hosts, depending on the circumstances. I will discuss this concept in depth.

C. fetus in particular taught me about stealth—how microorganisms acquire means of escaping host defenses. While 99.9 percent of all bacteria, including C. jejuni, are killed by factors found in blood, C. fetus glides into the bloodstream by donning a kind of “cloak of invisibility.” Even so, it can be trapped by the cells within a heathy liver. But if it is not cleared from the blood in someone with an injured liver (I later learned that the patient whom I’d seen earlier was a severe alcoholic), meningitis can result.

While I was working on C. fetus and C. jejuni in the early 1980s, a new relative of Campylobacter was discovered in, of all places, the stomach. Dubbed “gastric campylobacter-like organism” or GCLO (we now call it Helicobacter pylori), it turned out to possess a bag of tricks that, in Jekyll and Hyde fashion, can do us harm or protect us from harm. I have been chasing this organism for the past twenty-eight years, for I believe, and hope to prove, that it is the bellwether that can help solve the puzzle of our modern plagues.

My first encounter with that organism occurred in October 1983 at the Second International Workshop on Campylobacter Infections in Brussels, where I met Dr. Barry Marshall, a young doctor from Australia, who had discovered GCLO and claimed it caused gastritis and ulcers. No one believed him. Everyone “knew” that ulcers were caused by stress and excess stomach acid. I, too, was skeptical. I could easily see that he had discovered a new bacterium but, to me, he didn’t have much evidence then at all about ulcers.

It was only in the next two years, after other scientists had confirmed that there was indeed an association of the microbe with gastritis and ulcer disease, that I decided to see if I could make some contributions to understanding the nature of GCLO (which in 1989 was renamed Helicobacter pylori after genetic analysis revealed it to be in a separate genus from Campylobacter). Their relationship is a bit like that of lions (Panthera leo) and house cats (Felis catus): relatives for sure but far enough apart to be in different genera. My lab developed a blood test for the microbe and showed that if you carry it, your body has natural defenses against it.

To their great credit, Marshall and his research partner, Robin Warren, conducted clinical studies that showed that eradicating H. pylori with antibiotics cured ulcers. Others confirmed and extended their observations. Marshall and Warren went on to win the 2005 Nobel Prize in Physiology or Medicine for this work.

Meanwhile, physicians everywhere commenced an all-out war against H. pylori by prescribing antibiotics to anyone with gastric discomfort. Their mantra ultimately became “the only good H. pylori is a dead H. pylori.” I too had been on this same bandwagon for almost a decade.

But by the mid-1990s, I began to change my mind. Evidence was beginning to suggest that H. pylori is a member of our normal gut flora and plays a critical role in our health. It was only when I let go of the dogma proclaiming that “gastritis is bad” that I was able to re-evaluate the biology of H. pylori. Yes, H. pylori can be very harmful to some adults, but later we found that it may be very beneficial to many of our children. Eliminating it may be causing more harm than good. The details of my transition and the reasons for it are laid out in chapters 9, 10, and 11.

In 2000 I moved to New York University and set up a laboratory dedicated to studying how this ancient bacterium did its business in our stomach and what were the consequences to us. Over the following fourteen years, I have accumulated more and more evidence that the disappearance of this venerable microbe might be contributing to our current epidemics. And H. pylori led me to a broader study: the human microbiome itself.

These days my lab is bustling. We are currently working on more than twenty projects, looking at how antibiotics affect resident microbes and their hosts, in both mice and humans. In a typical animal experiment, we give mice antibiotics in their drinking water and compare them to mice that do not get the medication. We start very early in life, sometimes just before birth, and then we let the mice grow, studying how fat they become, how their livers are working, how immunity is developing in their gut, how their bones are growing, and what happens to their hormones and to their brains.

To us, the work is exciting, because in each of those areas we can see changes induced by early-life exposure to antibiotics. We have realized that early life is a key window of vulnerability. Young children have critical periods for their growth, and our experiments are showing that the loss of friendly gut bacteria at this early stage of development is driving obesity, at least in mice. We are just beginning studies on social development and celiac disease. We have many ideas for how we can apply our findings from mouse studies to humans. Ultimately, we seek to reverse the damage seen in people around the world, including establishing strategies for restoring the missing microbes. A key step in all of our approaches is to reduce the overuse of antibiotics in our children, starting now.

My odyssey over the nearly thirty-seven years since I saw that ill man in his hospital bed shivering with fever has convinced me that I am at the most critical stage of my own career. The years of working as a doctor specializing in infectious diseases and conducting scientific experiments have given me important perspectives about our modern plagues. I did not anticipate this direction when I was just starting out. But, like a series of transports, the work has carried me across the plains, mountains, and oceans of scientific medical research. It has led to new concepts about our changing modern life that I now want to share with you. The plagues today differ from those that affected my father’s sisters, but they are deadly as well.


Copyright © 2014 by Martin J. Blaser, MD

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Table of Contents


1. Modern Plagues          1

2. Our Microbial Planet          12

3. The Human Microbiome          22

4. The Rise of Pathogens          40

5. The Wonder Drugs          50

6. The Overuse of Antibiotics          64

7. The Modern Farmer          79

8. Mother and Child          87

9. A Forgotten World          104

10. Heartburn          123

11. Trouble Breathing          130

12. Taller          144

13. ... and Fatter          152

14. Modern Plagues Revisited          167

15. Antibiotic Winter          185

16. Solutions          199

Epilogue          218

Notes          221

Acknowledgments          257

Index          261

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  • Posted June 2, 2014

    This book looks at the harm that is being done to the human body

    This book looks at the harm that is being done to the human body by modern medicine, especially by the overuse of antibiotics, one of the greatest health discoveries of the last century.

    First of all, if a person is suffering from some major ailment, and antibiotics have been shown to work in the past, then don't hesitate to take them. But, taking antibiotics for every sniffle and sore throat is a terrible idea. Penicillin, for instance, is a broad-spectrum antibiotic. That means that it does not just kill the "bad" bacteria, it also kills beneficial bacteria (yes, there is such a thing). Out of, say, a million cold germs, at least one will be resistant to penicillin. With the "good" bacteria, that may have neutralized all of those cold germs, out of the way, that penicillin-resistant germ is now free to multiply without restrictions. Maybe it turns into penicillin-resistant flu, or even worse, pneumonia. What does the person do now?

    According to the author, overuse of antibiotics starts in early childhood. A baby spends nine months in a sterile environment before being born. It's first exposure to beneficial bacteria and microbes comes from going through the mother's birth canal. Wiping babies clean, as soon as they are born, while understandable, is a bad idea. Taking a baby by caesarian section, purely for convenience, totally bypassing the birth canal, is an even worse idea (if the life of the mother or the baby is in danger, then, by all means, do a c-section).

    Nearly all types of farm animals are fed antibiotics to keep them healthy, or fatten them up for slaughter. Some portion of those antibiotics will end up in the milk you drink, or the meat you eat. The lack of "good", disease-fighting, bacteria in the human body may be behind the recent huge rise in allergies, digestive diseases, asthma or some types of cancer.

    This is a huge eye-opener, and it will give the reader plenty to consider. It is very highly recommended for everyone.

    3 out of 3 people found this review helpful.

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    Posted July 13, 2014

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