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Who Switched Off My Brain? Controlling Toxic Thoughts and Emotions by Dr. Caroline Leaf
We're living in an epidemic of toxic emotions. Research shows that as much as 87% to 95% of mental and physical illnesses are a direct result of toxic thinking-proof that our thoughts affect us physically and emotionally. In this best-selling book, Dr. Caroline Leaf clearly communicates 13 ways to detox your thought life and live a life of physical, mental, and emotional wholeness.
144 pages, Paperback
First published January 1, 2006
259 people are currently reading
2905 people want to read
About the author
Caroline Leaf
60 books710 followersDr. Caroline Leaf is a cognitive neuroscientist with a PhD in Communication Pathology specializing in Neuropsychology. Since the early 1980‘s she has studied and researched the Mind-Brain connection. During her years in clinical practice as a Communication Pathologist she developed tools and processes that help people develop and change their thinking and subsequent behavior. Her scientific Science of Thought techniques have transformed the lives of patients with Traumatic Brain Injury (TBI), learning disabilities, emotional traumas and released the potential of thousands of young students and adults.
She has presented her unique Switch On Your Brain with the 5-Step Learning Process® and the Metacognitive-Map™ learning tool to thousands of students worldwide.
She developed the Geodesic Learning™ theory (how we think and process information) that has been conservatively shown to increase thinking, behavioral and academic performance by 35-75%. This revolutionary theory explains the Science of Thought, stating how thoughts form, how we process information and the power of the non-conscious mind and the relationship between the non-conscious and conscious. It explains that everything you do is first a physical thought in the physical brain. You think, and then you do, which cycles back to the original thought, changing it, and the thoughts connected to it, in a dynamic interrelationship. Therefore if your thinking is toxic, then your communication and behavior are toxic, and vice versa.
She has published numerous articles in academic journals and consumer magazines and has been widely interviewed in newspapers, on radio shows, and on television shows about her research and theories.
She has her own weekly TV show called "Switch On Your Brain" airing on TBN.
She frequently lectures to both Christian and secular audiences worldwide, linking scientific principles of the brain to spiritual, intellectual and emotional issues in simple and practical ways. She speaks on diverse topics relating to optimal thinking, and hence, brain performance, including:
1. Thinking and learning
2. Controlling your thought life
3. Managing stress
4. Eradicating toxic thoughts
5. Overcoming mental, emotional, and spiritual strongholds
6. Understanding male and female brain differences
7. Applying wisdom
8. Identifying your unique gifts
DR. CAROLINE LEAF’S DEGREES
University of Cape Town South Africa Degree of Bachelor of Science (Logopaedics) - December 1985
University of Pretoria South Africa Masters in Communication Pathology with distinction/cum laude - June 1990
University of Pretoria South Africa Doctor Philosophiae with specialization in Communication Pathology With distinction/cum laude and academic honors - May 1997
She has presented her unique Switch On Your Brain with the 5-Step Learning Process® and the Metacognitive-Map™ learning tool to thousands of students worldwide.
She developed the Geodesic Learning™ theory (how we think and process information) that has been conservatively shown to increase thinking, behavioral and academic performance by 35-75%. This revolutionary theory explains the Science of Thought, stating how thoughts form, how we process information and the power of the non-conscious mind and the relationship between the non-conscious and conscious. It explains that everything you do is first a physical thought in the physical brain. You think, and then you do, which cycles back to the original thought, changing it, and the thoughts connected to it, in a dynamic interrelationship. Therefore if your thinking is toxic, then your communication and behavior are toxic, and vice versa.
She has published numerous articles in academic journals and consumer magazines and has been widely interviewed in newspapers, on radio shows, and on television shows about her research and theories.
She has her own weekly TV show called "Switch On Your Brain" airing on TBN.
She frequently lectures to both Christian and secular audiences worldwide, linking scientific principles of the brain to spiritual, intellectual and emotional issues in simple and practical ways. She speaks on diverse topics relating to optimal thinking, and hence, brain performance, including:
1. Thinking and learning
2. Controlling your thought life
3. Managing stress
4. Eradicating toxic thoughts
5. Overcoming mental, emotional, and spiritual strongholds
6. Understanding male and female brain differences
7. Applying wisdom
8. Identifying your unique gifts
DR. CAROLINE LEAF’S DEGREES
University of Cape Town South Africa Degree of Bachelor of Science (Logopaedics) - December 1985
University of Pretoria South Africa Masters in Communication Pathology with distinction/cum laude - June 1990
University of Pretoria South Africa Doctor Philosophiae with specialization in Communication Pathology With distinction/cum laude and academic honors - May 1997
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Displaying 1 - 30 of 158 reviews
March 23, 2011
This was a great book with some inspiring ideas. I loved how Leaf used her Christianity beliefs in companion with her scientific knowledge. She even helped me see a different meaning behind some specific scriptures. Leaf explains the science of the brains chemistry in an extremely easy way to understand. Coming from someone who has anxiety and is always stressing about something, I feel like Leaf offers a lot of solid ideas for learning how to change thoughts and control unhealthy emotions. Even if you don't think you struggle with anxiety, ADHD, depression, ect., there isn't anybody who couldn't benefit from reading this book.
December 31, 2008
Our daughter, Bridget, gave me this book for Christmas. There are only 138 pages in this book. I couldn't put this book down. In fact, I read it in just a few hours today. Dr. Leaf states that reserachers say that 87% of the illnesses that plague us today are a direct result of our thought life. Once you read what she has to say on how your brain works and what happens to your body when we think negative thoughts, you can't wait to get to the last chapter and learn the steps to controlling your thinking. It is an excellent book.
February 21, 2012
I had the honour of hearing this enthusiastic and knowledgeable author speak at my Church over a period of three days.I even got a copy of my book signed:) I was in awe by how she used her psychological research to prove the word of God. The main focus of the book is how thoughts affect our brains; toxic thoughts can physically and emotionally harm us. The good news is that we are able to transform our way of thinking and live more positive, fruitful lives.
Although the writer is a PhD, the book is written in simple English and the psychology concepts are very easy to understand. It was a quick read and very enlightening!
Although the writer is a PhD, the book is written in simple English and the psychology concepts are very easy to understand. It was a quick read and very enlightening!
September 14, 2014
If I were to summarize “Who Switched off my Brain?”, in one sentence, it would be that: toxic (negative) thoughts, and the emotions that they are associated with, will physically alter the human body in a harmful way and by becoming aware of this process we can implement strategies to reduce negative thinking and moderate the corresponding chemicals that harm us.
At a more in-depth level, Dr. Caroline Leaf starts the book with an explanation of the physical process that takes place in our brain as we have thoughts and generate emotions. Not having had any education in the field of biology I may not be a good indicator of how technical/complex a discussion on brain function and chemistry should/could be; however, while I did find myself rereading several of the paragraphs, from a laypersons perspective the information was still basic enough that I could grasp the concepts. For example, Dr. Leaf explains that, “What you think and feel prompts your hypothalamus to begin a series of chemical secretions that change the way you function. The hypothalamus also directly influences the pituitary, another major gland within the brain. In this way, the hypothalamus gland is definitely warm actually the facilitator and originator of emotions and responds to life circumstances, such as fear, anxiety, stress, tension, panic attacks, phobia, rage, anger and aggression.”
Dr. Leaf goes on to explain that, “Thoughts that you don’t deal with properly become suppressed and can cause emotional and physical harm.” In other words, the negative thoughts we hold onto eventually cause a negative chemical response in our bodies that have a long-term, disastrous effect on our well-being. Fear, in and of itself, has vast and far ranging implications for our physical condition, “Research shows that fear, all on its own, triggers more than 1400 known physical and chemical responses and activates more than 30 different hormones.”
If we are feeling guilt, anger, resentment, self-doubt, cynicism and any other negative emotion we can think of, it is easy to see that our body eventually starts to rebel with digestive disorders, muscular tension, stunted growth in children, and a whole host of life threatening diseases
In spite of all the adverse effects of holding onto negative thoughts and emotions, Dr. Leaf uses the latter part of the book to present ways in which individuals can “detox their brain” and bring better health and harmony into their lives. Just as our thoughts can cause illness and disease, so too can they rejuvenate and restore health - but it all starts with awareness and the desire to break old habits and consciously create new, positive ones. Some of the steps to wellness include: consciously controlling our thoughts, expressing our emotions, taking responsibility, learning forgiveness, and various other practical actions we can take.
When we consider that, “87% of the illnesses that plague us today are a direct result of our thought life… what we think about affects us physically and emotionally. It’s an epidemic of toxic emotions.” then reading a 140 page book filled with information on how to reduce, or even eliminate, those toxic thoughts and emotions seems like the deal of a lifetime - and for many of us it might just be.
At a more in-depth level, Dr. Caroline Leaf starts the book with an explanation of the physical process that takes place in our brain as we have thoughts and generate emotions. Not having had any education in the field of biology I may not be a good indicator of how technical/complex a discussion on brain function and chemistry should/could be; however, while I did find myself rereading several of the paragraphs, from a laypersons perspective the information was still basic enough that I could grasp the concepts. For example, Dr. Leaf explains that, “What you think and feel prompts your hypothalamus to begin a series of chemical secretions that change the way you function. The hypothalamus also directly influences the pituitary, another major gland within the brain. In this way, the hypothalamus gland is definitely warm actually the facilitator and originator of emotions and responds to life circumstances, such as fear, anxiety, stress, tension, panic attacks, phobia, rage, anger and aggression.”
Dr. Leaf goes on to explain that, “Thoughts that you don’t deal with properly become suppressed and can cause emotional and physical harm.” In other words, the negative thoughts we hold onto eventually cause a negative chemical response in our bodies that have a long-term, disastrous effect on our well-being. Fear, in and of itself, has vast and far ranging implications for our physical condition, “Research shows that fear, all on its own, triggers more than 1400 known physical and chemical responses and activates more than 30 different hormones.”
If we are feeling guilt, anger, resentment, self-doubt, cynicism and any other negative emotion we can think of, it is easy to see that our body eventually starts to rebel with digestive disorders, muscular tension, stunted growth in children, and a whole host of life threatening diseases
In spite of all the adverse effects of holding onto negative thoughts and emotions, Dr. Leaf uses the latter part of the book to present ways in which individuals can “detox their brain” and bring better health and harmony into their lives. Just as our thoughts can cause illness and disease, so too can they rejuvenate and restore health - but it all starts with awareness and the desire to break old habits and consciously create new, positive ones. Some of the steps to wellness include: consciously controlling our thoughts, expressing our emotions, taking responsibility, learning forgiveness, and various other practical actions we can take.
When we consider that, “87% of the illnesses that plague us today are a direct result of our thought life… what we think about affects us physically and emotionally. It’s an epidemic of toxic emotions.” then reading a 140 page book filled with information on how to reduce, or even eliminate, those toxic thoughts and emotions seems like the deal of a lifetime - and for many of us it might just be.
May 9, 2012
This book sort of felt like quasi-science. There were mentions of studies done and research shows this but there was no reference to what studies these were or who did them.
While I think there are some good things in this book and that I agree with the fact that our thoughts and emotions can affect our physical well-being, I don't agree with it to the extent that the author holds to be true and that we just need to change our thought patterns to become healthy again. There definitely seems to be some missing facts here. But I'm not a scientist so what do I know.
I also didn't like the drawings in the book of the brain dressed as a person with a hat on. I didn't find they helped me understand the brain at all and felt they were actually childish.
While I think there are some good things in this book and that I agree with the fact that our thoughts and emotions can affect our physical well-being, I don't agree with it to the extent that the author holds to be true and that we just need to change our thought patterns to become healthy again. There definitely seems to be some missing facts here. But I'm not a scientist so what do I know.
I also didn't like the drawings in the book of the brain dressed as a person with a hat on. I didn't find they helped me understand the brain at all and felt they were actually childish.
January 21, 2013
This is, by far, the most practical book on cognitive development and mind change I have ever read. The practical five step process she developed is very simple and very powerful to use. I have had mental breakthroughs using her system that I have needed for decades.
Not only does she offer the practical system, she goes into great detail (but not too confusing detail) into how and why our thoughts have the effect that they do on our brain cells. This detail allows us to have confidence in applying the principles she teaches. It also gives us insight into how and when to use the principles she teaches. I have read this book over five times and have used it to develop my own system for cognitive training for myself and my peak performance coaching clients. Other than the Bible, there is no other book that has given me greater transformation. I can not say enough about this book.
Note: the original version goes into more scientific detail. However, it does not have the practical system I discuss here in this review. The revised version does have the practical system but not as much scientific detail. So, based on your needs, select your version accordingly.
Not only does she offer the practical system, she goes into great detail (but not too confusing detail) into how and why our thoughts have the effect that they do on our brain cells. This detail allows us to have confidence in applying the principles she teaches. It also gives us insight into how and when to use the principles she teaches. I have read this book over five times and have used it to develop my own system for cognitive training for myself and my peak performance coaching clients. Other than the Bible, there is no other book that has given me greater transformation. I can not say enough about this book.
Note: the original version goes into more scientific detail. However, it does not have the practical system I discuss here in this review. The revised version does have the practical system but not as much scientific detail. So, based on your needs, select your version accordingly.
August 30, 2010
Very good book. I would recommend it to everyone who wants to understand how the mind and the power of our thoughts/words work. The author is a Christian psychologist/therapist, but she does not push Christianity, she just states that she is a Christian and that works for her. She believes that faith is an important component for a healthy life/mind, and challenges the reader to find their own belief system.
Dr. Leaf's way of explaining scientific/medical processes is simple, and all audiences could benefit from reading this book. She has been doing research in the cognitive science arena for more than 20 years, and counsels individuals in need. Her knowledge is refreshing.
Dr. Leaf's way of explaining scientific/medical processes is simple, and all audiences could benefit from reading this book. She has been doing research in the cognitive science arena for more than 20 years, and counsels individuals in need. Her knowledge is refreshing.
February 8, 2011
I really tried to get into this and I thought it would offer real insight. At best it was warmed over info that you could get from any self help book wrapped in a neuroscience disguise.
~Erika
~Erika
June 14, 2020
a must read for anyone who struggles with depression/anxiety/stress (so all of us??)
October 30, 2010
I found this to be fascinating and very helpful. I am interested in scientific research that relates to my everyday life which is in abundance in this short book about the brain. The beginning chapters were pretty technical and had a lot of words related to the brain that I am unfamiliar with so that part dragged along a bit for me. However, after reading those beginning chapters, I have a much better understanding of how thoughts are processed and stored.
Caroline Leaf goes into a lot of detail in the first four chapters about how inter-related our thoughts are to our emotions and our health. Who Switched Off My Brain gives scientific research that supports what the Bible has said relating to our thoughts and thinking on things that are positive rather than negative. I liked the last two chapters best because those are the ones which focused more on how we can actually take control of our thoughts.
There are 13 techniques listed in the last chapter to implement to detox our brains. The one that "jumped" out at me describes exactly how if feel Mondays through Fridays which I share with you here:
"Rush, rush, rush! Hurry, hurry, hurry! Busy, busy, busy! The ever-increasing pace of life is called the “acceleration syndrome,” and it is causing a global epidemic of hurry sickness. The next time you think you don’t have time for exercise or relaxation, think again. The reality is simply that you have chosen to fill your time with activities and things other than exercise and relaxation." P. 135-136
I really need to relax during the weekdays too! Just to give you a sampling of some other things I learned by reading Who Switched Off My Brain?: Laugh and play every day, exercise, take time alone for prayer, love others no matter what, forgive freely, don’t eat when angry, touch, and root of stress is fear.
Caroline Leaf goes into a lot of detail in the first four chapters about how inter-related our thoughts are to our emotions and our health. Who Switched Off My Brain gives scientific research that supports what the Bible has said relating to our thoughts and thinking on things that are positive rather than negative. I liked the last two chapters best because those are the ones which focused more on how we can actually take control of our thoughts.
There are 13 techniques listed in the last chapter to implement to detox our brains. The one that "jumped" out at me describes exactly how if feel Mondays through Fridays which I share with you here:
"Rush, rush, rush! Hurry, hurry, hurry! Busy, busy, busy! The ever-increasing pace of life is called the “acceleration syndrome,” and it is causing a global epidemic of hurry sickness. The next time you think you don’t have time for exercise or relaxation, think again. The reality is simply that you have chosen to fill your time with activities and things other than exercise and relaxation." P. 135-136
I really need to relax during the weekdays too! Just to give you a sampling of some other things I learned by reading Who Switched Off My Brain?: Laugh and play every day, exercise, take time alone for prayer, love others no matter what, forgive freely, don’t eat when angry, touch, and root of stress is fear.
July 25, 2018
The book feels like a very simplified application of neuroscience, neuroplasticity and epigenetics, how we can change our thoughts and our brains in the process. It does not contain enough objectivity or information for the reader to make a fair evaluation. I guess the author tries to make it simple, and the notes in the back show that it is much more complex, but it still feels a lot like popular neuroscience(or neuroscience for dummies). Together with this science, she leaps to scripture and show how ideas are manifested there, but it’s often a very direct way. There is no extra theology in between. What I would have liked, is a little more dense read, and maybe take the step into psychology before going into the scripture and explaining the reasons why the scripture tell us the same thing as science. This book however is a 150 page big type fast read, so it is a bit gritty and direct in its approach. Leaf is not a very good writer in that sense, but she does put forth a somehow convincing argument nonetheless. An example is the sentence “Science and the Bible teach us not to fear!” but so does our human nature, and there is a lot more to fear than it only being good to avoid it. The last part, when Leaf goes through every one of her “Toxic Dozen”, it becomes a bit self helpy and formulaic, but also practical.
October 9, 2013
The Goodreads description of this book surprised me. The author quotes the Bible maybe a handful of times. I wouldn't describe this as a scriptural guidance book so much as a book about the brain with the occasional Biblical quote thrown in.
Leaf does a great job of breaking down how the brain creates and stores memories. She discusses: why we save some memories and not others, how to form new memories, and how children are affected by their brain chemistry. Chapter Six, detailing coping mechanisms, was particularly helpful. It's not a long read nor does it use complex language, which was nice.
I'd recommend this book to anyone- as we could all use fewer toxic thoughts and more positive ones in our brains.
"This is a book about a battle: the battle for your mind." pg 138
Leaf does a great job of breaking down how the brain creates and stores memories. She discusses: why we save some memories and not others, how to form new memories, and how children are affected by their brain chemistry. Chapter Six, detailing coping mechanisms, was particularly helpful. It's not a long read nor does it use complex language, which was nice.
I'd recommend this book to anyone- as we could all use fewer toxic thoughts and more positive ones in our brains.
"This is a book about a battle: the battle for your mind." pg 138
February 20, 2019
I love the premise of this book and of Dr Leaf’s take on toxic thought but I was very disappointed with the structure of the book itself. 5 of 6 chapters were filled with repetitive info, some irrelevant, and illustrations that didn’t make sense or, at best, didn’t add to the concept. The last chapter was the best but still not very in-depth if you are looking for practical application. Again, I’m a fan of Dr Leaf’s work but I would start with another Of her books instead of this one. Hopefully they are better written, organized, and more helpful in general.
February 19, 2015
Is really insightful about the brain. A short book that will help you improve your life. I would definitely recommend.
May 16, 2009
Now you know why Christ said to put the mind on good things.
April 21, 2019
This book is a highly practical guide to removing unhealthy patterns in our lives. It focuses on a process of gathering details, reflecting on their healthiness (or destructiveness), journaling in order to map out what is happening, revisiting the issue with greater clarity and then reaching out with a new, healthier habit.
Dr. Leaf has identified twelve debilitating processes that lead to breakdowns in thinking, health and spiritual well-being. She calls them the “dirty dozen”. They are: toxic thoughts, toxic emotions, toxic words, toxic choices, toxic dreams, toxic seeds, toxic faith, toxic love, toxic touch, toxic seriousness, toxic health and toxic schedules. Combining brain research from her PhD, Scripture and practice steps for each toxic effect, Leaf maps out a health plan for the reader to follow.
The chapters are short, highly accessible and tightly woven around the subject matter. There are few anecdotal diversions which leaves a work that succinctly provides tools for healthier living. Very enjoyable read.
Dr. Leaf has identified twelve debilitating processes that lead to breakdowns in thinking, health and spiritual well-being. She calls them the “dirty dozen”. They are: toxic thoughts, toxic emotions, toxic words, toxic choices, toxic dreams, toxic seeds, toxic faith, toxic love, toxic touch, toxic seriousness, toxic health and toxic schedules. Combining brain research from her PhD, Scripture and practice steps for each toxic effect, Leaf maps out a health plan for the reader to follow.
The chapters are short, highly accessible and tightly woven around the subject matter. There are few anecdotal diversions which leaves a work that succinctly provides tools for healthier living. Very enjoyable read.
April 7, 2021
Dla pierwszego znajomego i dla tych, którzy próbują samodzielnie sobie pomóc, nie prosząc o wsparcie - są dobre wskazówki. Polecam nie-specjalistom szerokiemu gronu odbiorców.
Nie do końca zgadzam się z koncepcją książki: jeśli jest to propaganda religijna, to należy o tym powiedzieć; jeśli informacja są przeznaczona dla docelowych odbiorców medyczno-religijnych, należy to również przekazać czytelnikowi z wyprzedzeniem. W przeciwnym razie dyskryminacja jest odczuwalna, jeśli ktoś wierzy w swojego boga, innego niż ogólnie przyjęty.
W 2021 roku książka jest przestarzała pod względem treści i znaczenia: klienci i ich terapeuci są teraz znacznie mądrzejsi.
Nie do końca zgadzam się z koncepcją książki: jeśli jest to propaganda religijna, to należy o tym powiedzieć; jeśli informacja są przeznaczona dla docelowych odbiorców medyczno-religijnych, należy to również przekazać czytelnikowi z wyprzedzeniem. W przeciwnym razie dyskryminacja jest odczuwalna, jeśli ktoś wierzy w swojego boga, innego niż ogólnie przyjęty.
W 2021 roku książka jest przestarzała pod względem treści i znaczenia: klienci i ich terapeuci są teraz znacznie mądrzejsi.
February 3, 2023
The first part of this book was so-so for me. It felt like an odd mixture of technical information written in a non-technical way so it wouldn't scare you off. There was nothing wrong with the information, it just didn't blend well in my opinion. And, there was hardly any story-telling, and this would prevent many people from reading the book.
The last part of the book was excellent. This is where it laid a practical, step-by-step plan to deal with toxic areas of your life. Caroline Leaf calls them the "Dirty Dozen." I plan to keep the book close at hand for the next week or so to pick it up and read these practical sections again.
The last part of the book was excellent. This is where it laid a practical, step-by-step plan to deal with toxic areas of your life. Caroline Leaf calls them the "Dirty Dozen." I plan to keep the book close at hand for the next week or so to pick it up and read these practical sections again.
September 8, 2023
This book exceeded my expectations! Not only does it explain the science behind thinking and how that correlates with your health, but it also gives you very practical solutions for dealing with toxic thoughts. It is a short read but gives you much to think about. It can be slightly confusing in the science-y parts of the book, but it is generally easy to comprehend. Also, she quotes the Bible like it is truth, which it is. I would highly recommend this book to anyone, but especially to people who often struggle with toxic thoughts and health problems related to stress. This book could help so many people.
April 22, 2020
I finished this book and immediately wanted to reread it, so I probably will since I am on vacation.
Read
May 18, 2019"...once that cycle of toxic thinking has been broken, your thoughts can actually start to improve every area of your life..." (13)
"A thought may seem harmless . . . Thoughts are measurable and occupy mental 'real estate.' Thoughts are active; they grow and change. Thoughts influence every decision, word, action and physical reaction we make. Every time you have a thought, it is actively changing your brain and your body..." (13)
"The result of toxic thinking translates into stress in your body, and this type of stress is far more than just a fleeting emotion . . . It harms the body and the mind in a multitude of ways from patchy memory to severe mental health, immune system problems, heart problems and digestive problems." (15)
"A massive body of research collectively shows that up to 80% of physical, emotional and mental health issues today could be a direct result of our thought lives." (15)
"...for every memory you make, you have a corresponding emotion attached to it, which is stored in your brain, and as a photocopy in your body's cells." (21)
"These emotions are very real and link your thoughts to the reaction in your body and mind . . . They can surface even years after an event has occurred, when the memory of that event is recalled." (22)
"...your thoughts create changes right down to genetic levels, restructuring the cell's makeup. Scientists have shown this restructuring is how diseases are able to take hold in the body. On the flip side, when we choose non-toxic thinking, we step into a whole new realm of brain and body function. 'Feel good' chemicals are released that make us feel peaceful and also promote healing, memory formation and deep thinking, which increase intelligence when combined together." (22)
"Your thoughts can sweep away stress, making you more clever, calm and in control of your emotions." (24)
"You can't have optimal growth and protection at the same time because your body usually concentrates on one or the other at any given time. . . Ideally, your body should be focusing more on growth than protection." (31)
"Cortisol regulates and supports functions in your heart, immune system and metabolism. However, when the cortisol level increases because of stress and flows in excess quantities through the brain, it causes memories to temporarily shrink, so you are unable to access particular memories." (32)
"Stress is harmful when it is sparked by negative emotions. But your body is designed to cope with brief bursts of stress like unforeseen circumstances or incredible obstacles, for example. When your system is stimulated by healthy, non-toxic thoughts, it can be very constructive; it makes you alert and focused and ready to move forward. These short bursts of stress can be protective, helping you avoid danger or preparing your brain to build helpful memories." (36)
"...your heart has its own independent nervous system, which is a complex system referred to as the 'brain in the heart.'
There are at least 40,000 neurons (nerve cells) in the heart - as many as are found in various parts of the brain . . . The heart also produces an important biochemical substance called an atrial peptide (specifically ANF). It is the balance hormone that regulates many of your brain's functions and stimulates behavior.
New scientific evidence on the heart's neurological sensitivity indicates there are lines of communication between the brain and the heart that check the accuracy and integrity of your thought life. " (40)
"Your immune system is definitively shown to be neurologically sensitive to your thought life. When your immune system faces an attack, such as when your thoughts life is toxic, it generates blood proteins called cytokines, which are known to produce fatigue and depression." (41)
"If you have been told that you are doomed to repeat the patterns in your family, that you are controlled by biology, that you cannot transcend the influence of your environment, then you have been lied to and need t0 hear the truth." (46)
"Positive habits and negative habits are built through the exact same process in your brain. The only difference is that the thoughts release different quantities of chemicals. Depending upon which kind of thought it is, either positive or negative, it will have a different structure caused by these chemicals." (47)
"The information stays in the hippocampus for 24 to 48 hours constantly being amplified each time it swirls to the front . . .
This amplification means the thought is very conscious and becomes 'labile' or unstable, which means it is moldable and can be changed. In fact, it must change." (59)
"...science is confirming that we can choose to interfere with protein synthesis by our free will. If you say you 'can't' or 'won't,' this is a decision of your free will and will actually cause protein synthesis and changes in the real estate of your brain. (60)
"Research has shown that mental practice - imagination, visualization, deep thought and reflection - produces the same physical changes in the brain as it would physically carrying out the same imagined process." (61)
"...we cannot control our circumstances, but we can control our reactions to those circumstances." (71)
"Negative words can be more harmful to you than the person you say them to, because your mind formed the toxic thought, meditated on the words and spoke them - reinforcing them in your mind. Because you created a negative stronghold, your body reacts with stress. If the stress chemicals flow in your brain for longer than 30 seconds, your thinking, intelligence, body and everything else are all going to be negatively affected." (95)
"...epigenetics (which teaches that our perceptions and life experiences remodel our genes, not the other way around) has changed the conventional understanding of genetic control." (99)
"Your heart is not just a pump. It is your body's strongest biological oscillator, which means it has the ability to pull every other system of the body into its own rhythm. When the heart is at peace and filled with love, the entire body under the direction of the brain, feels peace and love as well.
The opposite is also true. When your thought life is filled with toxic emotions, your heart is heavy and burdens your body and mind. In effect, your heart amplifies what is going on in the brain." (120) // like, what??!? mind. blown.
"...relaxing is not just a luxury; it's a necessity. . . If you don't build relaxation into your lifestyle you will become a less effective thinking . . . for the brain to function like it should, it needs regroup/consolidation time." (144)
"We need 10 to 20 minutes of some sort of down time every one-and-a-half to two hours. . . Work on your thoughts with imagination and fun-filled mental exercises. . . Imagine anything relaxing. Remember: when you imagine, it actually happens in your brain, so when you imagine fun things, all kinds of good chemicals flow, preparing you for the next round of concentration." (145)
"A thought may seem harmless . . . Thoughts are measurable and occupy mental 'real estate.' Thoughts are active; they grow and change. Thoughts influence every decision, word, action and physical reaction we make. Every time you have a thought, it is actively changing your brain and your body..." (13)
"The result of toxic thinking translates into stress in your body, and this type of stress is far more than just a fleeting emotion . . . It harms the body and the mind in a multitude of ways from patchy memory to severe mental health, immune system problems, heart problems and digestive problems." (15)
"A massive body of research collectively shows that up to 80% of physical, emotional and mental health issues today could be a direct result of our thought lives." (15)
"...for every memory you make, you have a corresponding emotion attached to it, which is stored in your brain, and as a photocopy in your body's cells." (21)
"These emotions are very real and link your thoughts to the reaction in your body and mind . . . They can surface even years after an event has occurred, when the memory of that event is recalled." (22)
"...your thoughts create changes right down to genetic levels, restructuring the cell's makeup. Scientists have shown this restructuring is how diseases are able to take hold in the body. On the flip side, when we choose non-toxic thinking, we step into a whole new realm of brain and body function. 'Feel good' chemicals are released that make us feel peaceful and also promote healing, memory formation and deep thinking, which increase intelligence when combined together." (22)
"Your thoughts can sweep away stress, making you more clever, calm and in control of your emotions." (24)
"You can't have optimal growth and protection at the same time because your body usually concentrates on one or the other at any given time. . . Ideally, your body should be focusing more on growth than protection." (31)
"Cortisol regulates and supports functions in your heart, immune system and metabolism. However, when the cortisol level increases because of stress and flows in excess quantities through the brain, it causes memories to temporarily shrink, so you are unable to access particular memories." (32)
"Stress is harmful when it is sparked by negative emotions. But your body is designed to cope with brief bursts of stress like unforeseen circumstances or incredible obstacles, for example. When your system is stimulated by healthy, non-toxic thoughts, it can be very constructive; it makes you alert and focused and ready to move forward. These short bursts of stress can be protective, helping you avoid danger or preparing your brain to build helpful memories." (36)
"...your heart has its own independent nervous system, which is a complex system referred to as the 'brain in the heart.'
There are at least 40,000 neurons (nerve cells) in the heart - as many as are found in various parts of the brain . . . The heart also produces an important biochemical substance called an atrial peptide (specifically ANF). It is the balance hormone that regulates many of your brain's functions and stimulates behavior.
New scientific evidence on the heart's neurological sensitivity indicates there are lines of communication between the brain and the heart that check the accuracy and integrity of your thought life. " (40)
"Your immune system is definitively shown to be neurologically sensitive to your thought life. When your immune system faces an attack, such as when your thoughts life is toxic, it generates blood proteins called cytokines, which are known to produce fatigue and depression." (41)
"If you have been told that you are doomed to repeat the patterns in your family, that you are controlled by biology, that you cannot transcend the influence of your environment, then you have been lied to and need t0 hear the truth." (46)
"Positive habits and negative habits are built through the exact same process in your brain. The only difference is that the thoughts release different quantities of chemicals. Depending upon which kind of thought it is, either positive or negative, it will have a different structure caused by these chemicals." (47)
"The information stays in the hippocampus for 24 to 48 hours constantly being amplified each time it swirls to the front . . .
This amplification means the thought is very conscious and becomes 'labile' or unstable, which means it is moldable and can be changed. In fact, it must change." (59)
"...science is confirming that we can choose to interfere with protein synthesis by our free will. If you say you 'can't' or 'won't,' this is a decision of your free will and will actually cause protein synthesis and changes in the real estate of your brain. (60)
"Research has shown that mental practice - imagination, visualization, deep thought and reflection - produces the same physical changes in the brain as it would physically carrying out the same imagined process." (61)
"...we cannot control our circumstances, but we can control our reactions to those circumstances." (71)
"Negative words can be more harmful to you than the person you say them to, because your mind formed the toxic thought, meditated on the words and spoke them - reinforcing them in your mind. Because you created a negative stronghold, your body reacts with stress. If the stress chemicals flow in your brain for longer than 30 seconds, your thinking, intelligence, body and everything else are all going to be negatively affected." (95)
"...epigenetics (which teaches that our perceptions and life experiences remodel our genes, not the other way around) has changed the conventional understanding of genetic control." (99)
"Your heart is not just a pump. It is your body's strongest biological oscillator, which means it has the ability to pull every other system of the body into its own rhythm. When the heart is at peace and filled with love, the entire body under the direction of the brain, feels peace and love as well.
The opposite is also true. When your thought life is filled with toxic emotions, your heart is heavy and burdens your body and mind. In effect, your heart amplifies what is going on in the brain." (120) // like, what??!? mind. blown.
"...relaxing is not just a luxury; it's a necessity. . . If you don't build relaxation into your lifestyle you will become a less effective thinking . . . for the brain to function like it should, it needs regroup/consolidation time." (144)
"We need 10 to 20 minutes of some sort of down time every one-and-a-half to two hours. . . Work on your thoughts with imagination and fun-filled mental exercises. . . Imagine anything relaxing. Remember: when you imagine, it actually happens in your brain, so when you imagine fun things, all kinds of good chemicals flow, preparing you for the next round of concentration." (145)
April 13, 2013
Dr Caroline Leaf is a brain scientist who has specialized in the science of thoughts for over 20 years. She is also a Christian. In this book, she explains scientifically (though in layman's terms) how our thoughts affect our bodies, and even our genes (epigenetics). She shows how to utilize this knowledge to better our mental and physical health.
Some minor annoyances...
She throws in Bible verses here and there that are pertinent to what she is discussing, but not always taken in context to the greater Bible passage that it came from. Also the verses are taken from the NLT version which used quite a bit of artistic license in its translation. I personally think a more literal translation like the NKJV would have been a better fit.
The interior graphic design of the book is very amateurish. Bad spacing, too many different fonts and cheap clipart really didn't do this wonderful book justice.
Nitpicking aside, I only had one real issue with the book...
I docked one star because in chapter 18, she discusses an experiment involving baby monkeys that were starved of contact from older monkeys to see the affect on their health. Not only can I think of several flaws off the top of my head which renders this experiment ludicrous, but I also believe that authors should stop quoting the findings of animal experiments because it seemingly justifies this cruelty. Animals are not for experimenting on.
Despite its flaws, I really believe this is an important book that should be read by almost everyone at some point in their lives.
It is a quick and easy read but there are sections that require meditation and I get the feeling that if I read this book a few times, new pearls will be revealed each time. I'm about to go for round two.
Some minor annoyances...
She throws in Bible verses here and there that are pertinent to what she is discussing, but not always taken in context to the greater Bible passage that it came from. Also the verses are taken from the NLT version which used quite a bit of artistic license in its translation. I personally think a more literal translation like the NKJV would have been a better fit.
The interior graphic design of the book is very amateurish. Bad spacing, too many different fonts and cheap clipart really didn't do this wonderful book justice.
Nitpicking aside, I only had one real issue with the book...
I docked one star because in chapter 18, she discusses an experiment involving baby monkeys that were starved of contact from older monkeys to see the affect on their health. Not only can I think of several flaws off the top of my head which renders this experiment ludicrous, but I also believe that authors should stop quoting the findings of animal experiments because it seemingly justifies this cruelty. Animals are not for experimenting on.
Despite its flaws, I really believe this is an important book that should be read by almost everyone at some point in their lives.
It is a quick and easy read but there are sections that require meditation and I get the feeling that if I read this book a few times, new pearls will be revealed each time. I'm about to go for round two.
March 15, 2018
The reason why I didn't give five stars is that a lot of the information presented is scientific, and just not very interesting or of use to me. The author did a great job of relating the scientific to Biblical Scriptures, which is not easy. In fact, it is hard to convince scientists that there is a God, so it was refreshing to read a book that explained the physical processes going on in your brain, and then give recommendation how to get mental healing from toxic issues by relying on scripture philosophies. I do like many of the activities that are recommended.
January 24, 2021
I follow Dr. Caroline Leaf on IG and love her posts so I thought I’d check out one of her books from the library. Maybe some of her newer books are better? Most of this book is a dry scientific explanation of the mind-body relationship as it pertains to toxic thoughts. The last chapter was practical application. I feel like the first five chapters could have been condensed and the last chapter practical application could have gone way deeper. Overall though, helpful info to know and apply to your life and thought patterns for sure.
May 2, 2012
I can't say I like her writing style, it has that yucky self-help book tone that turns me off and for some reason nothing she has written so far has stuck in my brain. Yet nonetheless, I am pleased that a Christian scientist wrote a book on this subject, i hope I enjoy the last half of the book more then the first half
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February 9, 2015This book is revolutionary! I love that God has shown Dr. Caroline how science is matching up with what the Bible has said all along! Fascinating!
October 30, 2023
After seeing DVD series of Dr. Caroline leaf, my brain just saw the light and I was able to believe in healing, and to work on a plan to achieve my healing. Understanding how the brain works through her shared knowledge saved me from several years of Chronic depression. For this reason I was excited to read this book and I wasn't disappointed. As a Christian, it was very enjoyable all throughout because everything she mentioned resonated with my beliefs, but if you are not Christian, many of her phrases and things she mentions might be a little less relatable, however, I hope it doesn't discourage you from reading her books because after all she's a scientist and regardless her religious beliefs, she also shares very valuable scientific information that can be extremely helpful for someone who is trying to become a better person. Also, if you are very visual, I recommend watching her cds, which will show images of everything she explains about how the brain and the mind works.
April 17, 2019
Dr. Leaf breaks down the way the brain works and creates memories and thoughts, and explains how we can work within our own brains to rewire them from toxicity to health in 12 main areas of our lives. This is vital! I now feel the freedom to throw out a lot of other books on healing and self-help that were good but didn’t quite scratch the itch... this truly scratches every itch and, best of all, it’s written in basic, clear writing.
This book is a must-read, and I recommend taking the time to go through all of her exercises for 21 days and rewire your brain! I read the content but since this is a library book I ordered myself a physical copy so that I can take 21 days to do the toxic thought detox.
This book is a must-read, and I recommend taking the time to go through all of her exercises for 21 days and rewire your brain! I read the content but since this is a library book I ordered myself a physical copy so that I can take 21 days to do the toxic thought detox.
May 30, 2019
Very interesting book with a lot of details about how your brain works in a way that makes it understandable. Author doesn't really think you should used medication for mental health issues unless it is absolutely essential and uses research to show how changing your thinking should improve your mental thought processes and effects on the rest of your body. Not sure I agree with this coming from healthcare background.
September 4, 2024
Really good book on your thought life and how to examine it both spiritually and from a natural health perspective. She gives great tips on handling toxic thoughts and being mindful of stress and the effects it has on your body and life in general. It’s a very practical book too. I enjoyed it. Some of it was a little over my head (like the more in depth scientific terms etc) but a lot of it was useful and beneficial for normal daily life application.
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