Kombucha and Kimchi: How Probiotics and Prebiotics Can Improve Brain Function
By Soki Choi
()
About this ebook
Did you know you can fight Alzheimer's, Parkinson’s, MS, ADHD, autism, anxiety, depression, stress, chronic pain, and more with what you eat? The discovery of the gut-brain-axis is quickly emerging as the most exciting health concept in decades. Mounting evidence has shown that gut bacteria aren't just good for a healthy immune system or maintaining our weight—they're also good for the brain!
In this groundbreaking book, Soki Choi takes us through the microbiotic revolution and the latest breakthroughs in gut-brain research that show how intestinal flora shapes neural development and brain biochemistry. Combining the latest science—presented in accessible, layman terms—with practical tips on how to eat, Choi also shares twenty of her best recipes for kombucha and kimchi, the fermented foods packed with good gut bacteria.
Follow your gut, treat food as medicine, and indulge in kombucha and kimchi to nourish your brain!
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Kombucha and Kimchi - Soki Choi
For Ella and Esther
© Text Soki Choi, Photos Roland Persson 2018
First English-language edition
English language translation copyright © 2019 Skyhorse Publishing
Original title Kimchi och kombucha: Den nya vetenskapen om hur tarmbakterierna stärker din hjärna
First published by Bonnier Fakta, Stockholm, Sweden
Published in the English language by arrangement with Bonnier Rights, Stockholm, Sweden
All rights reserved. No part of this book may be reproduced in any manner without the express written consent of the publisher, except in the case of brief excerpts in critical reviews or articles. All inquiries should be addressed to Skyhorse Publishing, 307 West 36th Street, 11th Floor, New York, NY 10018.
Skyhorse Publishing books may be purchased in bulk at special discounts for sales promotion, corporate gifts, fund-raising, or educational purposes. Special editions can also be created to specifications. For details, contact the Special Sales Department, Skyhorse Publishing, 307 West 36th Street, 11th Floor, New York, NY 10018 or info@skyhorsepublishing.com.
Skyhorse® and Skyhorse Publishing® are registered trademarks of Skyhorse Publishing, Inc.®, a Delaware corporation.
Visit our website at www.skyhorsepublishing.com.
10 9 8 7 6 5 4 3 2 1
Library of Congress Cataloging-in-Publication Data is available on file.
Photos by Roland Persson
Graphic design and illustrations by Katy Kimbell
Cover design by Laura Klynstra
Cover photo credit: Roland Persson
Print ISBN: 978-1-5107-4898-9
Ebook ISBN: 978-1-5107-4899-6
Printed in China
TABLE OF CONTENTS
Prologue: The start of a new era
CHAPTER 1 The microbiotic revolution
The brilliance of evolution
Bacteria’s bad reputation
The discovery of a new organ
A closer look at gut bacteria
Gut bacteria, inflammation, and the immune system
Gut flora—from the cradle to the grave
CHAPTER 2 The dialogue between the gut and brain
The gut-brain axis
Gut bacteria are crucial for your brain
A lifelong symbiosis
The gut, its bacteria, and your emotions
How your gut bacteria talk to your brain
The journey of bacteria through the immune system
CHAPTER 3 The role of gut bacteria in our mental health and more
The dark epidemic of our time
The role of gut bacteria in stress, anxiety, and depression
The role of gut bacteria in Alzheimer’s and Parkinson’s
The role of gut bacteria in autism and ADHD
CHAPTER 4 Let food be your medicine
Food takes to the medical stage
Historical offenses against our gut flora
Eat your way to a stronger brain
The future of medicine
Your bacterial guide to a stronger brain
Additional advice on psychobiotics
CHAPTER 5 Kimchi and kombucha
Korea’s favorite health food
Kimchi—the new superfood
Making kimchi
Kombucha—a bubbly probiotic
Making kombucha
CHAPTER 6 My favorite recipes
Epilogue: The health revolution begins with you
Glossary
References
Index
Conversion Charts
PROLOGUE
The start of a new era
There is currently a huge buzz around, in many people’s opinion, the next big thing in medicine and well-being; the link between gut bacteria and the brain. It seems that gut bacteria don’t just play a role in regulating our immune system, but they are also a deciding factor in many issues relating to our mental health. Even if research is still in its infancy, the rapidly expanding output of studies show important links between everything from stress, anxiety, depression, Alzheimer’s, Parkinson’s, autism, ADHD, and so on, and an imbalance in gut flora. Not the best news for those who have spent time and energy on self-help books, medicine, psychologists, and other forms of therapy when a simple fecal transplant (a fancy term for stool transfer) would have sufficed.
It seems strange, but also rather amusing, that modern people, who are capable of landing on the moon and splitting the atom, have not researched gut bacteria until now, especially when this busy ecosystem has existed literally right beneath our eyes in our gut—or maybe that’s why!
Did you know that there are 39 trillion living microorganisms in your gut? Thirty-nine trillion! I had to double-check the number of zeros: 39,000,000,000,000—that’s more than the number of stars in our galaxy. Imagine a huge, sprawling kingdom populated by bacterial strains and other exotic inhabitants such as archaea, protozoa, fungi, and viruses. Together they create a fascinating ecosystem where they play, get along, and sometimes bicker in our furry intestines. I don’t exactly envy the existence of the bacteria farther down in the splashy intestinal tubes; it’s dark, damp, sour, short-lived, and brutal. So it’s no surprise that for a long time our unicellular inhabitants were considered unimportant with only the most basic tasks to complete, such as producing sulfuric gases and feces. The discovery of gut flora
and its importance to our brain has greatly revised our previous understanding of how disease occurs, and this opens up new possibilities for us to influence our mental health.
In order to equip you with this new knowledge about gut flora’s effect on your brain, I have pored over more than four hundred scientific articles (even more than what I had studied for my own PhD). Even more articles were published while I wrote this book, which was challenging, but it also showed how fresh, vibrant, and ever-changing this field of research is. Since I’m not a medical doctor and my own research hasn’t focused on gut bacteria and the brain (rather complex medical systems), I asked several fact-checkers to quality assure this text to inspire confidence in my readers. As I wrote, more thoughts and questions arose, and some have been formatted into little boxes I’ve called Soki Choi reflects,
that are scattered throughout the book.
In this book I will reveal how the gut, gut bacteria, and the brain communicate. I’ll also present groundbreaking new research on the relationships between gut bacteria and our most common diagnoses relating to mental health and the brain. First and foremost, I will show you the effect that fiber and bacteria can have on the brain and why this might be the case. In addition to general tips I provide on which foods will strengthen your brain, we will also dive into the magical world of kimchi and kombucha. Both kimchi and kombucha are full of healthy fiber and bacteria and consistently top the charts for the world’s healthiest foods. Both are also from my second home country, Korea. Did you know that the people who are thought to live the longest reside in South Korea (where locals eat kimchi every day)? Last but not least, I will give you some of my best recipes for kimchi and kombucha—all to kick-start your brain.
Welcome to the amazing world of bacteria; the adventure starts here . . .
CHAPTER 1
The microbiotic revolution
The brilliance of evolution
Bacteria can be found everywhere. They live in the deepest seas, the hottest springs, the coldest icy landscapes, and even up in the clouds, where they act as seeds to rain and snow. The live in the mouth, nose, belly button, lungs, breast tissue, genitals, semen, saliva, and of course our gut. Bacteria have and will always be part of our evolutionary history. To understand how essential bacteria are for the survival of humankind, we need to remind ourselves of how life began. So let us raise our eyes to the heavens and rewind to the birth of our universe.
The rise of bacteria
It can be hard to imagine, but 13.7 billion years ago there was nothing; just total silence, emptiness, and stillness. In one ferocious moment—the big bang—all material, energy, space, and time was created from this empty void. From this gigantic primal explosion our new universe sprung to life and expanded at an enormous rate—even faster than the speed of light. Planet Earth may appear large and unique to us humans, but our blue planet is just a tiny speck of dust in an infinite universe.
In relation to the age of the universe, our home planet is very young. Earth was only
created 4.5 billion years ago, but even this figure is such a huge amount of time to get to grips with. Let us therefore compress the life span of earth into a year. Imagine that it’s Monday, January 1. Your home planet—Earth—doesn’t yet have a solid surface. By February an atmosphere is created, which cools and solidifies the earth’s surface to a hard crust, then the oceans are created. March is when it all happens: the first signs of life appear in the form of single-celled organisms. During April and May the heat becomes unbearable and it rains all the time. In September the earth is struck by an ice age, making the earth cold, and by October it warms up again. During the fall, multicellular organisms such as fungi and jellyfish appear, and by November fish are created. In December the first vertebrates crawl onto land. In the middle of December the most feared animals, the dinosaurs, dominate our world while the first flowers blossom (to my mother’s delight). However, the night of December 26, the earth is struck by an asteroid and in one fell swoop, all dinosaurs disappear from our planet. Instead mammals roam around while the earth constantly changes through weather, wind, volcanic eruptions, and earthquakes. Now we are into the last week of the year and things move fast. Mountain ranges such as the Andes, the Alps, and the Himalayas are created (to the great joy of people like me who love skiing and climbing). Midnight is getting closer, and you may be wondering when humans appeared? Less than 30 minutes before the strike of midnight on New Year’s Eve, on December 31, man is finally born and can begin his evolutionary journey on earth (a close call!).
The main point in this short evolutionary tale is to show how for the most part of earth’s existence, it was inhabited by tiny bacteria, invisible to our eyes. From March to October there were no other forms of life than our friends, the single-celled organisms. All trees, plants, birds, animals, and insects that you see in nature today are all evolutionary newbies; meanwhile, bacteria lay the foundations for you, your friends and family, and all other life-forms. In the words of an American scientist, animals are our evolutionary icing but bacteria are the cake itself.
The world’s most important marriage
Of all the fantastic things about the unusual history of microbes, there is one unique deciding factor that needs to be mentioned: the unification between archaea and bacteria. This is without a doubt evolution’s largest and most unlikely relationship, and I have chosen to call this event the world’s most important marriage. But first we need a quick biology lesson.
All living things can be placed into three groups: eukaryotes, archaea, and eubacteria. In biological terms, humans are eukaryotes, a category that also includes all animals, plants, fungi, and even algae. Prior to the existence of eukaryotes, all living things consisted of either eubacteria or archaea. Bacteria are known to most of us, but few have heard of archaea. Originally, researchers thought that archaea were bacteria because they look similar on the outside; however, they are completely different. Archaea, as opposed to bacteria, like the extreme things in life. They hang out in boiling volcanoes, swim around in corrosive acid, press themselves to the bottom of the deepest seas, splash around in super-salty water, or chill out in the coldest ice blocks. Put it simply, they love extreme sports! During the first 2.5 billion years on earth, archaea and bacteria lived side by side, following their own trajectories. Destiny, however, had other ideas. One day, a bacteria—let’s call it Bacterium—was so impressed by the extreme sportsman archaea that it escaped and, in some bizarre way, managed to squeeze in and merge with the archaea. It’s through this marriage that scientists believe multicellular eukaryotes came to be, the prerequisite for all life on earth. This is the story of the origin of humankind: two huge domains of unicellular lives, bacteria and archaea, that merged to create a third multicellular life, eukaryotes, to which the human race belongs.
With the principle of strength in numbers,
more eukaryotes started to work with each other and some lumped together to gain more genes and build more elaborate organs and systems. The process eventually led to larger and more complex life-forms being created, such as animals and humans. And while the eyes, the liver, and other organs also evolved later on during independent instances, scientists believe that the birth of the eukaryote cell was and is the most unique and important incident of all. In the context of earth’s calendar, the biggest marriage in evolutionary history occurred at the end of October.
A constantly evolving living ecosystem
The microbiota is a living ecosystem that is constantly changing. It can take care of us or poison us, depending on what we feed it. The microbiota is formed by microbes such as archaea protozoa, viruses, fungi, and, most of all, our friends, bacteria. The unicellular fungi are a lot larger than the bacteria, and their role is to clean up the gastrointestinal tract (gut) by mopping up junk and undigested food scraps. However, if you start to feed the fungi with junk such as sugar, they can turn aggressive and harm you—this is why it is very important to look after your microbiota. The collective genes of the microbiota are known as a microbiome. Mapping the microbiome is what has driven the current microbiotic revolution forward. Microbes live everywhere on and inside your body, but nearly all microbiota—99 percent—are found in the gut. And of all the microbes in the gut, 90 percent are bacteria rather than archaea, protozoa, etc. This is why the term microbiota can be used synonymously with gut flora. From now on, I will use the terms gut bacteria and gut flora instead of microbes and microbiota.
Hardworking and multitalented
Apart from the fact that bacteria created all life on earth, they also continue to be essential to our world. For example, they cleanse poisons and toxins from our body. And did you know that photosynthetic bacteria in the sea create half of the oxygen we take in with every breath, as well as bind an equal amount of carbon dioxide? Bacteria are such an essential part of our lives that we have even outsourced some of our most important bodily functions to them—they digest our food, create vitamins and minerals, protect us from disease, and strengthen our immune system. They even produce substances that affect the way we smell—including our less palatable odors. They release signals that promote growth in our bodies and influence the development of our nervous system, mood, behavior, and the list goes on. Despite the fact that bacteria are tiny and invisible to the naked eye, while lacking a brain and a nucleus (unlike us), they still beat us by a mile when it comes to being multitalented. They also have an impressive ability to adapt to extreme environments. So the next time you have an irritating infection, think about all the fantastic things bacteria do for us. Bacteria are without a doubt evolution’s geniuses.
Some examples of essential tasks we have outsourced to our gut bacteria
–They break down food we can’t eat
–They break down carbohydrates, protein, and fat
–They produce vitamins
–They strengthen our immune system
–They convert hormones
–They provide our gut with energy
–They can detoxify painkillers
–They produce acids and gases
Bacteria’s bad reputation
In light of the fact that bacteria are the origin of all life forms, they are the reason I’m writing this book and you’re reading it at this exact point in time. If this is the case, one might wonder why evolution’s virtuosos have gotten such a bad reputation!
Fear pays!
For a long time, bacteria have had a bad reputation among humans. Even in this day and age, most of us see bacteria as unwelcome disease carriers that we have to avoid at all costs. It’s not surprising if you think about it. Traumatic epidemics such as the plague killed almost half of Europe’s population during the fourteenth century, when 200 million people died. Other diseases have also left deep cultural scars in our memories. Even in modern times, the media have jumped on the bandwagon, giving us one terrifying story after another. When everyday items such as keyboards and cell phones are shown to be teeming with more disgusting
bacteria than a lavatory seat, the media go into overdrive and happily reap the rewards of their magazines flying off the shelves. The basic message has always been that all bacteria are dirty, dangerous, and nasty carriers of disease. Unsurprisingly, some people have a phobia of bacteria. However, this one-sided view is deeply twisted, unfair, and simply wrong. The fact is that less than one hundred species of bacteria cause infectious diseases in humans, while thousands of other species are harmless and even essential for our body to function. Sadly, the media is rarely interested in giving a balanced view of reality.
It is not just the media that have given bacteria such an undeserved reputation. Their bad image might also be caused by the fact that they are invisible to the naked eye, and thus we usually only notice the negative consequences of bacteria. Who hasn’t sneezed loudly during a quiet church service, suffered an incredible earache from an abscessed ear infection that refuses to go, or had an awful stomach upset with painful cramps? Most of us only notice bacteria when they make us ill, so it is not so strange that most of us view them as the bad guys.
Without bacteria, society collapses!
Researchers have simply not had the right tools to dissect the world of bacteria—until now. It has only been recently that scientists have realized how important bacteria are to our health. The evidence is so overwhelming these days that scientists agree that bacteria’s bad reputation is completely undeserved, something this book is trying to prove. Deep-seated truths have a tendency to stick, so let’s conduct a thought experiment so you can see your bacteria in a new light: imagine what scientists believe would happen if all bacteria suddenly disappeared from the surface of the earth. Sure, it would mean that certain infections would be a mere memory, but at the same time it also means most plants and animals would die, resulting in a total breakdown of the food chain and therefore a huge reduction in our population. Without bacteria, society would collapse within a year. For too long, we have ignored and feared these very important bacteria, and it is time we start to appreciate them. If we don’t, our understanding of ourselves, our origins, and our future health will be hugely deprived.
The discovery of a new organ
For a long time, researchers viewed our intestines as long, sloppy, fleshy tubes whose job was to digest the food we ate and push undigested scraps through in the form of feces. The large intestine was seen as a fat sausage that absorbed water and salt and got rid of gas and waste, which was not very impressive from a biological perspective and, as it turned out, an incorrect assumption. With the discovery of gut flora, that is, the bacteria in our gastrointestinal tract, and its increasing amount of intelligent functions, our attitude toward it is very different today.
Researchers around the world suggest that we can no longer discuss our health without describing the central functions that bacteria have. They have even agreed that gut flora fulfill the criteria of an organ.
These days, gut flora, together with our gut, are known as our new super organ.
Let’s take a closer look at it.
Our new super organ
Thanks to new research, a new super organ has been discovered
in our bodies well into the twenty-first century. We have known of the existence of the gut and gut flora but have been unaware of their central role to our brain function and mental health until now. Our gut flora weighs around the same as our brain or liver, about two to four pounds. And speaking of the liver, gut flora has a metabolic rate that surpasses the liver a hundred times over. In addition, 90 percent of all serotonin, which is a neurotransmitter that affects your mood and can lead to depression if there is an imbalance, is created in the gut. As if this wasn’t enough, 80 percent of your immune system’s cells can be found in the gut. The gut is therefore the largest immunological organ in our body, and so it’s not surprising that more people are calling the gut and gut flora our new super organ. The brain and heart need to watch out—they have some serious competition!
A pioneer without modern technology
How is it possible that it’s taken humans so long—up until the twenty-first century—to discover a new organ? The answer is inadequate microscopes. It’s a bit like Christopher Columbus missing the discovery of a new continent due to bad binoculars. Legendary scientists such as Charles Darwin have been accused of only focusing on large multicellular life-forms that can be seen with the naked eye and that live on the earth’s surface. But Darwin actually did collect bacteria; however, the limitations of technology meant that he could not continue his research. The honor of discovering bacteria is actually bestowed on a Dutch man, Antonie van Leeuwenhoek. With the help of a homemade microscope, he saw bacteria in a drop of rain in the year 1674, and since then technology has developed at a huge pace.
A quick journey through the gut
Maybe you consider the gut to be a long, sloppy thing that you never see, but in reality you look into it twice a day when you brush your teeth—the mouth is actually the entrance to your gut. This is where digestion begins with the help of your jaw muscles chewing—your body’s own super blender. The masticated food passes to the long small intestine with its creases that actively and elegantly pump the food forward. The food substance then moves into the large intestine where most of the gut bacteria reside.
Feces beats the iPhone in data capacity
From the first bite at the entrance of the gut (the mouth) to the last gut stop (the rectum), it takes roughly