The Inflamed Mind: A Radical New Approach to Depression
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As seen on "CBS This Morning"
Worldwide, depression will be the single biggest cause of disability in the next twenty years. But treatment for it has not changed much in the last three decades. In the world of psychiatry, time has apparently stood still...until now with Edward Bullmore's The Inflamed Mind: A Radical New Approach to Depression.
A Sunday Times (London) Top Ten Bestseller
In this game-changing book, University of Cambridge professor of psychiatry Edward Bullmore reveals the breakthrough new science on the link between depression and inflammation of the body and brain. He explains how and why we now know that mental disorders can have their root cause in the immune system, and outlines a future revolution in which treatments could be specifically targeted to break the vicious cycles of stress, inflammation, and depression.
The Inflamed Mind goes far beyond the clinic and the lab, representing a whole new way of looking at how mind, brain, and body all work together in a sometimes misguided effort to help us survive in a hostile world. It offers insights into how we could start getting to grips with depression and other mental disorders much more effectively in the future.
Edward Bullmore
Prof Edward Bullmore, MB PhD FRCP FRCPsych FMedSci, trained in medicine at the University of Oxford and St. Bartholomew’s Hospital, London; then in psychiatry at the Bethlem Royal & Maudsley Hospital, London. He moved to Cambridge in 1999 and is currently Co-Chair of Cambridge Neuroscience, Scientific Director of the Wolfson Brain Imaging Centre, and Head of the Department of Psychiatry at Cambridge University. He has published more than 500 scientific papers and is one of the most highly cited scientists worldwide in neuroscience and psychiatry.
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Reviews for The Inflamed Mind
21 ratings4 reviews
- Rating: 3 out of 5 stars3/5Having suffered from depression for years, this book caught my eye. The author is a Professor of Psychiatry at the University of Cambridge and his central thesis is that bodily inflammation is a major cause of depression, more so than a chemical imbalance in the brain, which has been the medical consensus for several decades. While he provides a range of evidence about links between inflammation and depression, to my mind he does not prove a causal link, cherry picks his supporting evidence, and makes varying contradictory comments about the effectiveness of anti-inflammatories in combating depression. He seems to have it in big time for Rene Descartes and his dualist philosophy, which he sees as preventing proper holistic consideration of mind and body in the treatment of disease. Overall, this was also quite a technical medical read, and I thought was of very little practical help to sufferers from depression.
- Rating: 4 out of 5 stars4/5A revolutionary view of depression as often caused by and concomitant with systemic inflammation. This inflammation can come from social stress, but it can also come from changes in the body in response to physical assaults. Bullmore does a great job of getting beyond Cartesian dualism (its the mind of the body) and showing that both mind and body are contiguous and continuous in generating the experience of depression. However he shows that the view of depression he puts forward has implications for treatment (give depressed patients anti-inflammatory drugs of treatments if the biomarker of C reactive protein is up - that is they are inflammed), and currently doctors won't give you this treatment even if you ask. Time for some more GPs to read this book.
- Rating: 5 out of 5 stars5/5This is brilliant work. The science behind Dr. Bullmore's approach is sound -- and it holds up in light of real-world data. Excellent information.
- Rating: 3 out of 5 stars3/5Bullmore asserts that certain types of depression are caused by inflammation in the body that can penetrate the blood-brain barrier. He believes this causal relationship has been missed over time due to the ongoing acceptance of the views of René Descartes, and contends these views are still influencing medical professionals today. He calls this a “Cartesian divide.” This divide splits mind and body into separate and distinct parts. He hopes to prove that treatment for inflammation will help some patients who are not responding to traditional psychiatric treatments. He describes the experiments that have been conducted in support of his ideas.
He starts by describing the immune system and how inflammation arises. He suggests measuring cytokines and macrophages as indicators (biomarkers) of inflammation. It appears there is some evidence for “inflamed depression,” which is presented in this book, but (as the author admits) his claims are far from proven. He contends anti-inflammatory drugs could, once studied and approved, help a substantial number of people. My overall impression is that further study of the “inflammation theory of depression” is warranted but I remain skeptical until more testing is completed.
This book will appeal to those with a specific interest in depression and the mind-body connection. I thought (from my previous reading) that the idea of the mind and body as an inseparable whole was more pervasive in the medical community than is depicted in this book. It is a bit jargon-laden in places but is easily consumed by someone with a basic knowledge in this field. I will be keeping an eye out for further research into “inflamed depression.”
The author is a neuroscientist, Professor of Psychiatry at the University of Cambridge, and Vice-President of Experimental Medicine at the pharmaceutical company GlaxoSmithKline.
Book preview
The Inflamed Mind - Edward Bullmore
Preface
One of the things that first attracted me to psychiatry, many years ago, was that it tries to deal with the most personal human afflictions: clinical disturbances of our selves, our emotional balances and imbalances, our states of mind and memories, our ideas about the world and its relationship to us. As a young doctor, the richly individual content of mental health symptoms seemed much more interesting to me than physical health symptoms, like ankle swelling or skin itching. It was also attractive to me, from a scientific perspective, that all these mental symptoms must originate from the brain; but it was not yet known how. It seemed likely to me then, and it still does today, that if we could understand more about how mental health disorders are generated by brain mechanisms we would be in a much stronger position to do something about treatment and prevention. We would probably also feel less ashamed or afraid to talk about mental health issues if we knew more certainly where they came from, or what caused them.
So, when I was about 30, finding out more about how mental symptoms originated from the brain became a professional research mission for me. At this time, around 1990, many psychiatrists were focused on how brain chemicals like dopamine and serotonin could cause disorders like psychosis and depression. But it was clear there was an enormous amount more still to understand. I realised that I would need to become a scientist as well as a clinical psychiatrist.
For several years in the 1990s, I was supported by the Wellcome Trust to do a PhD, supervised by Professor Michael Brammer, at the Institute of Psychiatry in London. The first functional magnetic resonance imaging (fMRI) scanners were just starting up, in a few places around the world, and I got involved in mathematical analysis of these new-fangled fMRI data, to make maps of human brain function in healthy people and patients with mental health disorders. I started writing and co-writing many scientific papers on neuroimaging, neuroscience and mental health. This was a very exciting transition for me. I was lucky enough to be in the right place at the right time to catch the first wave of fMRI research, which has since expanded massively into a global science ecosystem. I thought it could only be a matter of time, perhaps a few years, certainly by the time I was 50, before the irresistible flood of new discoveries from brain scanning, and brain science generally, must force radical improvements in how we think about and treat mental health disorders.
It was in that spirit that I started as a Professor of Psychiatry in the University of Cambridge in 1999. At first, I carried on with my brain imaging research, trying to find new ways of measuring and analysing the complex network organisation of the human brain. I am probably most well-known as an academic scientist for my work on network neuroscience or the connectome
. But that is not the topic of this book.
As I approached my mid-40s, I couldn’t help noticing that, despite what seemed like a tremendous amount of progress in neuroscience internationally, there was no sign yet of any great change in what was happening day-to-day in local NHS clinics and hospitals. I became restless about the prospect of making any difference to psychiatric practice simply by writing more papers about brain scans. I recognised that the most powerful lever of change in the history of medicine was always the advent of a new treatment. I found myself wanting to know more about how new drug treatments were being discovered for depression, psychosis and other disorders.
That’s why, in 2005, I took an unusual chance to start working half-time for GlaxoSmithKline, also known as GSK, one of the UK’s biggest pharmaceutical companies. Half the week I spent working in my University lab on the fascinating esoterica of network analysis and the other half I spent working as the director of GSK’s clinical research unit, conveniently located about 200 yards down the hall in Addenbrooke’s Hospital. In the GSK unit, we did a lot of studies to test the effects of new drugs that were in clinical development for psychiatry, neurology and other areas of medicine. It felt exhilarating at times to be inching closer to the promise of new treatments; but then, in 2010, GSK abruptly closed down all its research and development programs in mental health. I realised I was a 50-year-old psychiatrist working for a company that didn't want to do psychiatry any more. And if a company as big and strong as GSK didn’t see an opportunity to make therapeutic progress in psychiatry, what did that mean for the prospects of those radical improvements in treatment that I had been confidently expecting to witness for the last 20 years? That is the moment I began to start thinking seriously about the ideas that this book is about.
I became increasingly interested in the work of other scientists who had been pioneering a new field of research that linked the brain and the mind to the workings of the immune system. They called it immuno-psychiatry or neuro-immunology. The first time I heard of it, to be honest, it sounded bonkers to me, for all sorts of good reasons. But as I delved into it deeper, it seemed increasingly plausible that this might be a scientific strategy that was different enough to offer a fresh chance of making therapeutic progress in psychiatry. I talked to lots of people and once again I was lucky. My GSK boss agreed it could be worth looking into and from about 2013 we were supported by the Medical Research Council and the Wellcome Trust to set up research partnerships with other companies and academic experts to find out more about the links between inflammation and depression.
Hopefully that explains how I came to be involved in the immuno-psychiatry research program that I am still working on scientifically; but it doesn’t explain why I wrote a book about it. Scientists are highly incentivised to write papers for a technically specialised readership of their professional colleagues, rather than books that almost anyone might read. But as I have spent the last five years or so learning more about how the immune system and the nervous system interact, how inflammation of the body can cause mental symptoms like depression, it has increasingly seemed to me that these questions resonate widely. They touch on some very basic ideas about the relationship between the body and the mind, as well as the traditional difference between psychiatry and the rest of medicine. And they point towards not just a few new anti-depressant drugs but a radically reconfigured – dare I say, radically better – way of dealing with mental and physical health disorders together, rather than apart, as we currently do.
This book does contain some technical language, especially in relation to the immune system, because if I tried to tell the story without any technical details I would not be telling it like it really is. And it is, I think, a really exciting story of how we could begin to see new science make a surprising difference to mental health. I hope you enjoy it.
Ed Bullmore
Cambridge, UK
March 2018
One
DARING TO THINK DIFFERENTLY
We all know depression. It touches every family on the planet. Yet we understand surprisingly little about it.
This dawned on me in an acutely embarrassing way one day in my first few years of training as a psychiatrist, when I was interviewing a man in the outpatient clinic at the Maudsley Hospital in London. In response to my textbook-drilled questioning, he told me that his mood was low, he wasn’t finding any pleasure in life, he was waking up in the small hours and unable to get back to sleep, he wasn’t eating well and had lost a bit of weight, he was guilty about the past and pessimistic about the future. I think you’re depressed,
I told him. I already know that,
the patient told me, patiently. That’s why I asked my GP to refer me to this clinic. What I want to know is why am I depressed and what can you do about it?
I tried to explain about anti-depressant drugs, like selective serotonin reuptake inhibitors, or SSRIs, and how they worked. I found myself burbling about serotonin and the idea that depression was caused by a lack of it. Imbalance was the word I had heard more experienced psychiatrists deploy with aplomb on these occasions. Your symptoms are probably caused by an imbalance of serotonin in your brain and the SSRIs will restore the balance to normal,
I said, waving my hands around to show how an imbalanced thing could be rebalanced, how his wonky mood would be restored to equilibrium. How do you know that?
he asked. I started to repeat all the stuff I had just learnt from the textbooks about the serotonin theory of depression, before he interrupted: No, I mean how do you know that about me? How do you know that the level of serotonin is imbalanced in my brain?
The truth is that I didn’t.
That was about 25 years ago, and we still don’t have confident or consistent answers to these and many other questions about where depression comes from or what to do about it. Is depression all in the mind? Is my depression just
the way I am thinking about things? But then why is it so often treated with drugs that work on nerve cells? Is it really
all in the brain? To our friends and family who are depressed, we may not know what to say. If we are depressed ourselves, we may feel ashamed to say so.
The silence around depression and other mental health disorders is less deafening now than it was. We are getting better at talking about it, which is good, even if we don’t always agree with each other. We can see that depression is very common, it can be really disabling in many ways and it can reduce both the quality of life – depressed people have less experience of pleasure – and the quantity of life – depressed people have reduced life expectancy. We’re not surprised to read that the economic costs of depression and related disorders are so vast¹, ² that if we could completely cure depression in the UK from the start of the next financial year it would be roughly equivalent to adding 4% to GDP, or tripling the projected annual growth rate of the whole economy from 2% to 6%. If the country somehow became totally un-depressed, we’d boost our national wealth massively.
But despite our growing awareness of how commonly depressive episodes and disorders crop up among people we know, and the massive scale of the public health challenge that depression represents globally, we still have only limited ways of dealing with it. There are some widely available and moderately effective treatments out there; but there have been no breakthrough advances in the last 30 years. What we had for depression in 1990 – serotonin-tweaking drugs, like Prozac, and psychotherapy – is pretty much still all that we’ve got therapeutically. And that’s evidently not good enough: otherwise depression wouldn’t be on track to become the biggest single cause of disability in the world by 2030.
We must dare to think differently.
One day in 1989, when I was training as a physician, just before I started to specialise in psychiatry, I saw a woman in her late fifties with an inflammatory disease called rheumatoid arthritis. I’ll call her Mrs P. She had been arthritic for many years. The joints in her hands were painfully swollen and disfigured by scarring. The collagen and bone in her knees had been destroyed so that the joints no longer worked smoothly and she found it difficult to walk. Together we talked through the long list of physical signs and symptoms that are diagnostic of rheumatoid arthritis. She ticked all the boxes. Then I asked her a few questions that weren’t on the standard checklist. I asked about her state of mind, her mood, and over the course of the next 10 minutes or so she quietly but clearly told me that she had very low levels of energy, nothing gave her pleasure any more, her sleep was disturbed and she was preoccupied by pessimistic and guilty thoughts. She was depressed.
I was pleased with myself. I thought I had made a minor medical discovery by doubling her diagnoses. She had come to see me with rheumatoid arthritis; I had added depressive disorder. I rushed to tell my senior physician this important news: Mrs P is not only arthritic, she’s also depressed.
He was not impressed by my diagnostic acumen. Depressed? Well, you would be, wouldn’t you?
We could both recognise that Mrs P was depressed and she was inflamed. However, the conventional medical wisdom of the time was that she was depressed because she knew she had a chronic inflammatory disease. It was all in the mind. It did not occur to either of us that it might originate in the body. That Mrs P might be depressed – not because she knew she was inflamed – but simply because she was inflamed. Mrs P left the clinic no less likely to be depressed or fatigued than she was when she’d arrived. We’d not dared to think differently and we’d done nothing to make a difference.
About 30 years down the road, we are becoming much more fluent in a new way of thinking scientifically about the links between depression and inflammation, between mind and body, as I recently discovered for myself after a visit to the dentist.
Root canal blues
A few years ago I had an old filling in one of my molars that had gone rotten, become infected, and my dentist needed to drill out the cavity all the way to the tips of the roots of the tooth. Undergoing root canal surgery is not my favourite way to while away an hour or so but I knew it had to be done. I was cheerful enough when I obediently hopped up on the chair and opened wide. But as soon as it was all done, I wanted to go home, to go to bed and not talk to anyone. And when I was alone at home I found myself cogitating gloomily on the grave until I went to sleep.
The next morning I got up, went to work and forgot about mortality. I had endured some drilling of my tooth, some bruising of my gums, and I had briefly experienced some mental and behavioural symptoms: lethargy, social withdrawal, morbid rumination. You could say I had been a bit depressed: but – hey – who likes going to the dentist?
There seems to be nothing out of the ordinary about this sequence of events – and there isn’t – but the ordinary explanation for it turns out to be not the only one.
The traditional way of thinking about this tiny episode of illness starts with my body’s immune response to infection and injury. My tooth had been infected by some bacteria; my gums had become inflamed in response to that infection; the dentist’s drilling and scraping, although intended to achieve a long-term surgical cure, had the short-term disadvantage of making my gums even more inflamed and increasing the risk of the bacteria spreading from my tooth into my bloodstream. The reason I went to the dentist, and what happened to me when I got there, amounted to a challenge to my body’s integrity, a threat to my survival and a clarion call to my immune system to step up its inflammatory response.
Working out this mechanistic chain of cause and effect, which leads from a physical attack, like an injury or an infection, to an inflammatory response from the immune system, is one of the truly game-changing triumphs of scientific medicine. This is the triumph of immunology, the science that now permeates our understanding of almost all diseases, and underpins the therapeutic success of vaccination, transplant surgery and successful new drugs for diseases like rheumatoid arthritis, multiple sclerosis and increasingly more kinds of cancer. This immensely powerful science can provide a minutely detailed explanation for how infection in my tooth could cause local inflammation of my gums, and how surgery could exacerbate the inflammation acutely.
But immunology has not yet had nearly so much to say about what inflammation feels like for the inflamed patient, or how inflammation can have effects on thoughts and behaviour. Why did I want to be by myself? Why did I want to go to bed and stay there? Why was I so gloomy? The answers to questions like these have traditionally come from psychology, rather than immunology.
Thus I told myself a psychological story, that my close encounter with the dentist must have reminded me that I was literally getting long in the tooth. And this concrete affirmation of a well-worn metaphor for mortality must have triggered a period of rational pessimism as I calculated how much longer I might have to live. To paraphrase my self-diagnosis, to put it another way: I became momentarily depressed because I thought about the implications of my root canal surgery. My mental state was a reflection or meditation on my physical state, rather than directly caused by my physical