The Strange History of the Research That Was Banned, Then Quietly Brought Back

How to Change Your Mind

A Deep Dive Into Michael Pollan’s Exploration of Consciousness, Habit and Change

A Mind Set in Stone Blog Deep Dive

A quick note before we start

This post is a discussion of a book, not advice to use any substance. Psilocybin, LSD and similar drugs are illegal in many countries, and they carry real risks, particularly for anyone with a personal or family history of psychosis or other serious mental health conditions. Everything in the tips section is something you can do with no substances at all, because the most useful ideas in Pollan’s book are about how minds get stuck and how they can loosen up.

Why This Book Matters

Most of us would love to be able to change our minds. Not just about small things, but about the deeper stuff: the thought loops that run at three in the morning, the habits we keep repeating, the way our world seems to narrow a little more each year. The trouble is that an adult mind is brilliant at one thing above all, which is staying the same.

That is the puzzle at the centre of Michael Pollan’s How to Change Your Mind. On the surface it is a book about psychedelics, and it covers their history, their science and their return to serious medical research in considerable detail. Underneath, it is a book about something much more universal: how a mind gets set in its ways, what it would take to loosen that, and what we might learn about consciousness along the way.

Pollan is best known for writing about food, and he approaches this subject the same way he approached that one, as a curious, sceptical, deeply thorough journalist who is willing to put himself into the story. He interviews scientists, therapists, underground guides and patients. He reads the old research and the new. And, in the most personal part of the book, he reports on his own experiences with a clear-eyed honesty that is part of why the book became a bestseller.

In this deep dive we are going to do something slightly different from a standard book summary. We will walk through the book’s main ideas, including the history, the neuroscience and the therapy trials. Then we will pull out 10 practical tips that you can use in everyday life, none of which require anything beyond a notebook, a bit of time and some willingness to try. We will finish with a ten question quiz so you can see how much has stuck.

If you have ever felt stuck in your own head, this one is for you.

About the Book and Its Author

Michael Pollan is a journalist, author and professor at the University of California, Berkeley, best known for books such as The Omnivore’s Dilemma and In Defense of Food. How to Change Your Mind, published in 2018, was a bit of a departure for him. The full title runs to a mouthful: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression, and Transcendence. It became a bestseller and was named among the best books of the year by several major outlets.

The book blends several kinds of writing. There is natural history, in the form of a deep dive into the world of mushrooms. There is cultural history, tracing how a group of compounds went from medical curiosity to counterculture symbol to banned substance and, eventually, back to the laboratory. There is neuroscience, with a clear explanation of what researchers think is happening in the brain. There are case studies from therapy trials. And there is memoir, as Pollan, then in his early sixties, tries out several of these experiences himself, partly to find out whether a mind as settled as his could still be moved.

That mix is what makes the book work. It never asks you to take anything on faith. It simply lays out what is known, what is suspected, and what Pollan himself experienced, and lets you draw your own conclusions.

A Short, Strange History

To understand why this research matters, it helps to know how remarkable the journey has been. Pollan tells it as a story in three acts: discovery, backlash and renaissance.

Act one: discovery. In the 1950s, a New York banker and amateur mycologist named R. Gordon Wasson travelled to a remote village in Mexico, where a healer named Maria Sabina led him through a ceremony involving sacred mushrooms. His account, published in Life magazine in 1957, introduced millions of Americans to the idea. Meanwhile, the Swiss chemist Albert Hofmann, who had first synthesised LSD in 1938, had discovered its extraordinary effects by accident in 1943. By the early 1950s, scientists and psychiatrists were exploring what these compounds might do.

Aldous Huxley’s 1954 essay The Doors of Perception brought the subject to a literary audience, and the psychiatrist Humphry Osmond coined the word “psychedelic”, meaning mind-manifesting, in correspondence with Huxley. For a while, serious researchers treated these compounds as promising tools. There was work on alcoholism, on anxiety and on the experience of dying.

Act two: backlash. Then the 1960s happened. Timothy Leary, a Harvard psychologist, became a cultural lightning rod, and the compounds escaped the laboratory and moved into the wider culture. Moral panic followed. By 1970, in the United States, LSD and psilocybin were classified in the most restrictive category of drugs, and a good deal of the international system followed suit. Research dried up almost entirely, and for roughly a generation, it was nearly impossible to study these substances at all.

Act three: renaissance. From the 1990s onwards, a small number of determined scientists began to carefully restart the work. A major turning point came in the 2000s, when researchers at Johns Hopkins University published studies looking at the kinds of experiences volunteers had under carefully controlled conditions. Teams at NYU and Imperial College London followed. Pollan’s book arrived at the point when this quiet revival was becoming impossible to ignore.

The Brain Science: Ruts, Networks and Filters

The scientific heart of the book is a set of ideas about how the brain organises itself, and what changes when that organisation is disrupted. There are three concepts worth knowing.

The default mode network. When you are not focused on a task, your brain does not simply idle. A particular set of regions switches on and gets busy with self-reflection, daydreaming, remembering and imagining the future. This is the default mode network, or DMN. Researchers working with Pollan describe it as something like the brain’s centre of gravity for the sense of self. When it is overactive, as seems to happen in depression and rumination, it can become a kind of echo chamber.

The entropic brain. Robin Carhart-Harris, a researcher at Imperial College London, proposed that a healthy adult brain tends towards order, and that this order can become excessive. A mind that is too rigid keeps running the same patterns. Disrupting that rigidity, even briefly, lets different regions of the brain talk to each other in new ways. This is where the snow-covered hill image comes in: the ruts are the old patterns, and shaking them up opens up the possibility of new routes.

The reducing valve and the controlled hallucination. Huxley’s reducing valve is the idea that the brain filters experience down to what is useful. Pollan notes that modern neuroscience supports a related view: ordinary waking consciousness is less like a window on reality and more like a model the brain builds, a kind of controlled hallucination guided by incoming data. The model is usually good enough, but it is still a model. That is a humbling thought, and an oddly freeing one.

What makes all this relevant to anyone, drugs or no drugs, is the overlap. Pollan points out that experienced meditators show patterns of reduced DMN activity that resemble those seen in the trials. In other words, the basic mechanism, a quieter self-focused network and a looser, more flexible mind, may be something humans have been working towards through contemplative practice for thousands of years.

Set and Setting

One of the most practical ideas to come out of the book is the concept of set and setting, which was popularised by Leary and which every guide and researcher Pollan meets takes seriously. Set refers to the mindset a person brings: their mood, their expectations, their fears and their intentions. Setting refers to the surroundings: the room, the music, the people who are present, and how safe it all feels.

The researchers are clear that these factors are not decoration. They can shape an experience as strongly as anything else. A person who arrives frightened, in a chaotic or unfamiliar environment, with no one they trust, is likely to have a very different time from a person who arrives prepared, in a calm room, with a guide they know.

This is why the research is so structured. Volunteers meet their guides several times beforehand. The room is designed to feel comfortable. Music is chosen carefully. There is time afterwards to talk it through. The whole thing is built to maximise the chances of a safe and meaningful experience.

Why it matters for the rest of us

You do not need to be anywhere near a laboratory to use this. Any moment that matters, whether it is a difficult conversation, a job interview or a creative session, goes better when you take your state of mind and your surroundings seriously.

The Therapy Trials

The most hopeful part of the book looks at what happened when researchers began to test these compounds as part of structured therapy. Pollan focuses on three areas.

End-of-life anxiety: Researchers at institutions including Johns Hopkins and NYU worked with people facing terminal cancer diagnoses, many of whom were experiencing intense fear and distress. Many participants reported that their anxiety eased and that they felt more at peace afterwards. These are some of the most affecting stories in the book.
Addiction: Early work looked at whether guided sessions might help people quit smoking, with small pilot results that the researchers found encouraging, and at alcohol dependence, which has a longer, older history in the research.
Depression: Teams at Imperial College London studied people with long-standing depression that had not responded to other treatments. The rationale connects directly to the ruts and the DMN: if depression is partly a matter of rigid, repetitive thought, loosening those patterns might create an opening.

Pollan is careful to stress that these were small studies, and that the guided structure of the sessions is a big part of the picture. The compounds were never simply handed over. Every participant had preparation, a trained guide present throughout, and follow-up conversations to help them make sense of what had happened. That structure is easy to overlook and, according to the researchers, is essential.

Another recurring theme is the sense of meaning and connection that many participants report, and how long it can last. The researchers do not claim to fully understand why. Pollan, characteristically, is happy to say so too.

Pollan’s Own Journey

What lifts the book above a standard science explainer is that Pollan does not stay on the sidelines. Having spent years interviewing scientists and therapists, he decides that to write honestly about the subject he needs to experience some of it himself. He does so cautiously, with guides, and he is open about his nerves.

He describes several experiences with different compounds, some of them shifting his sense of self in ways that he finds genuinely hard to put into words. He writes about the strange feeling of watching his ego loosen and, for a time, seem to dissolve altogether, which he describes as both unnerving and, in the end, surprisingly freeing. He is also honest about the limits of what he can claim. Memoirs of extraordinary experiences always risk sounding grandiose, and he works hard to avoid that.

What he comes away with is subtle rather than dramatic. A more relaxed relationship with his own thoughts. A new openness to practices such as meditation that he had previously found hard to take seriously. A renewed sense of how much of ordinary life he usually misses. Whether you find that persuasive or not, it is a refreshing change from the usual breathless account.

Hype, Risk and Reality Checks

A good deep dive should be honest about the limits of a book, and Pollan himself provides plenty of material for caution.

The trials are small: Most of the studies involve small numbers of volunteers, often carefully screened. That is a long way from showing how well a treatment would work across the wider population.
Blinding is hard: It is difficult to run a classic blinded trial when participants can generally tell whether they have received an active compound, which raises questions about expectation and placebo effects.
Risks are real: The book makes clear that these experiences can be frightening, and that people with a personal or family history of psychosis or certain other conditions are generally excluded from trials for good reason.
Hype is a danger: Pollan notes that the field has been through cycles of excitement before. Commercial interest and enthusiasm are growing, and that makes sober assessment more important, not less.
Legal reality: These substances remain illegal in many countries. Nothing in the book is a recommendation to seek them out, and none of the tips in this post requires you to.

Reading with that balance in mind is part of the point. The book is at its best when it asks questions rather than delivering verdicts, and a reader who comes away both curious and cautious has probably read it correctly.

Common Questions About the Book

Is the book telling people to take drugs? No. Pollan reports on the research and on his own experiences, and he is explicit about the risks and the legal position. It is journalism, not a how-to guide.

Do I need a science background? Not at all. The neuroscience sections are written in plain language, and the analogies, such as the snow-covered hill, do most of the heavy lifting.

Is it a good read for sceptics? Probably the best kind. Pollan keeps asking the awkward questions himself, so you rarely feel as though you are being sold something.

Where is the most useful part for everyday life? The sections on the default mode network, set and setting, and integration. They translate directly into habits you can try without any special circumstances.

Is there a video version? Yes, the book was later adapted into a documentary series, though the book goes into considerably more depth on the history and the science.

10 Tips and Tricks You Can Use Without Any Substance

The most valuable ideas in How to Change Your Mind are about how minds get stuck, and how they can loosen. These 10 tips take those ideas and turn them into everyday practices. Each comes with a short explanation, a real-world style example and some simple steps to try.

Spot your mental ruts before you try to climb out of them

One of the most useful images in the book comes from the brain scientists Pollan interviews. Picture a hill covered in fresh snow. Every time you ski down it, you follow the tracks that already exist, and every run deepens them. After years, the ruts are so deep that you can barely steer out of them. That, the researchers suggest, is a decent picture of how a mature brain works. Our habitual thoughts, reactions and routines run down well-worn channels because that is efficient.

The trouble is that the same efficiency can trap us. The book links rigid, repetitive patterns to problems such as depression, addiction and obsessive thinking, where the mind keeps sliding into the same groove no matter how much we want to go somewhere else. The first step to doing anything about a rut is knowing exactly which ones are yours.

Example: Sam notices that every Sunday evening he spirals into the same dread about Monday: “I’m behind, they’ll notice, I’ll be found out.” The script has barely changed in six years. Once he writes it down for three weeks running, he realises it isn’t ten separate worries. It is one rut, and it has a very predictable trigger.

Try this:

For one week, jot down any thought that you notice repeating, however small.
Next to each, note the situation that set it off and what you usually do next.
Pick just one rut to work on. Trying to reroute every habit at once is a recipe for giving up by Thursday.

Give your default mode network a rest, with no chemistry required

The brain science at the heart of the book centres on the default mode network, or DMN. It is the set of brain regions most active when your mind wanders, when you replay past conversations, rehearse future ones, or think about yourself. It is useful, because it helps build your sense of who you are. It is also the engine of rumination.

Researchers Pollan speaks to found that activity in this network drops sharply during a psychedelic experience. The detail that matters for the rest of us is that brain scans of experienced meditators show a similar quieting. You do not need a substance to get some of the benefit. Anything that pulls attention firmly into the present, outside your own head, gives the network a break.

Example: Priya is chewing over a clipped email from her manager at lunchtime. Instead of reading it for the fifth time, she takes a ten minute walk with her phone in her pocket and names five things she can see and four she can hear. It does not solve the email. It does stop the loop, and by the time she is back at her desk she can answer it calmly.

Try this:

Try ten minutes a day of meditation or mindful walking. Apps help, but a timer works fine.
When you catch yourself ruminating, shift attention to the senses: what can I hear, feel and see right now?
Protect one phone-free block each day, even if it is only the first twenty minutes after waking.

Practise beginner’s mind in ordinary life

Pollan returns again and again to the idea that adult consciousness is a filter. He draws on Aldous Huxley, who borrowed the idea of a “reducing valve” from the philosopher Henri Bergson: the brain narrows the flood of sensory information down to what is useful for getting through the day. That is why a child can spend half an hour fascinated by a puddle and an adult walks straight past it.

The filter is useful, but it comes at a cost. The longer we live on autopilot, the less we actually notice, and the flatter life can feel. The remedy the book points towards is novelty and fresh attention. You do not need an extreme experience for that. You can practise looking at familiar things as though you were seeing them for the first time.

Example: Dan has driven the same route to work for eight years and could do it in his sleep, which is more or less what he has been doing. One Tuesday he takes a different road and spots a bakery, a mural and a footpath he never knew existed. It is a tiny thing, but he arrives at work more awake than he has been in months.

Try this:

Change one small routine each week: a different route, a different breakfast, a different seat in the meeting room.
Pick one everyday object or place and give it five minutes of full attention, as if you had never seen it before.
Ask yourself: what would I notice here if this were my first day?

Design your set and setting for anything that matters

“Set and setting” is one of the book’s most portable ideas. Set means your mindset: your mood, expectations and intentions going into an experience. Setting means the physical and social environment: where you are, who is there, what the room feels like. The researchers and guides in the book are emphatic that these two factors shape an experience at least as much as what is on the table in front of you.

The principle works well beyond the lab. A difficult conversation, a creative session, a therapy appointment and even a night’s sleep all go better when you think about your state of mind and your surroundings in advance, rather than just turning up and hoping.

Example: Alex needs to have a hard conversation with his brother about money. His first instinct is to do it over a noisy lunch. Instead he suggests a walk, and spends five minutes beforehand writing down what he actually wants from the conversation, which is to be heard, not to win. The talk is still hard, but it does not blow up.

Try this:

Before any important moment, ask: what state am I in, and what space am I in?
Change one thing about each. Eat first, put the phone away, move the conversation outdoors, dim the lights.
Set an intention in a single sentence, such as “I want to listen before I react.”

Seek out awe on purpose

When volunteers in the trials described their most powerful sessions, they kept reaching for the same words: awe, wonder, unity, meaning. Researchers measure this with questionnaires about mystical-type experience, and many participants rated their sessions among the most meaningful experiences of their lives. Pollan is careful to say that these experiences are hard to put into words, and that is partly the point.

You will not reproduce that intensity on a Saturday afternoon, but a gentler version of awe is available to almost everyone. Standing in front of something vast, whether that is a coastline, a night sky, a piece of music or a great work of art, tends to shrink our sense of self and our problems with it. For a mind that is stuck circling its own concerns, that shift in scale can be quietly powerful.

Example: Maya is anxious about a promotion decision and has barely slept. On Saturday evening she sits on the sea wall and watches the waves for an hour without a phone. Her problems do not vanish, but they stop feeling like the whole of her life.

Try this:

Schedule one awe experience a week, the way you would schedule a gym session.
Go somewhere that feels big: a hilltop, the shoreline, a planetarium, a cathedral, an open field at night.
Listen to one piece of music all the way through with nothing else competing for your attention.

Loosen the grip of the ego without losing yourself

Pollan spends a good deal of the book on the ego, which in his account is a useful part of the mind that mediates between our inner impulses and the outside world. It gives us a stable sense of who we are. The problem comes when it becomes too dominant, turning into a defensive, self-protecting voice that treats every criticism as a threat and every change as a danger.

The most dramatic experiences in the book involve a temporary dissolving of that sense of a separate self, often described as frightening and liberating in equal measure. The everyday takeaway is much more modest, and much more usable: you are not the same thing as your thoughts. Learning to see a thought as something your mind is producing, rather than as a fact about you, gives you room to choose your response.

Example: After a blunt piece of feedback, Chris’s first thought is “I’m a failure.” He tries rewording it: “I’m having the thought that I’m a failure.” The feeling does not disappear, but it loses some of its authority. He can now ask whether the feedback is actually fair, and what he might do with it.

Try this:

Practise the phrase “I’m having the thought that…” whenever a harsh self-judgement shows up.
Ask whether you would say the same thing to a friend in the same situation.
Remind yourself that a role (manager, parent, expert) is something you do, not the whole of who you are.

Let mortality sharpen what matters

Some of the most moving material in the book concerns people with life-threatening illnesses who took part in guided sessions as part of research at institutions such as Johns Hopkins and NYU. Many of them reported that their fear of death eased, and that they came away with a clearer sense of what mattered to them. Pollan is cautious about overstating what small trials can show, but the stories stay with you.

You do not need to be ill to borrow the underlying lesson. Keeping death at the edge of your awareness, gently and without drama, is a very old way of cutting through trivia. Most of what clutters a busy mind looks different when you remember that time is limited.

Example: Hannah writes a short letter from herself at ninety, describing what she is glad she did with her life. Halfway through, she realises that three of the things on the list involve her dad, whom she has been meaning to visit for a year. She books the trip that evening.

Try this:

Write a one-page letter from your ninety-year-old self to the person you are today.
Ask: what would I most regret not having done in five years’ time?
Take one small action towards it this week. Small and real beats large and imaginary.

A gentle note: if thinking about death feels overwhelming or distressing rather than clarifying, that is a good moment to talk to a doctor, a therapist or someone you trust.

Don’t change alone: find a guide

It is easy to miss, but the research in the book is built around people, not just pills. Sessions involve trained guides who spend time with participants beforehand, stay with them throughout, and help them make sense of what happened afterwards. Pollan returns often to the idea that the relationship and the structure around the experience are a large part of why it works.

That is a lesson worth taking seriously in ordinary life. We tend to treat personal change as a solo project and then wonder why willpower runs out by February. People who change most reliably usually have someone alongside them: a therapist, a coach, a mentor, a patient friend.

Example: Jo has been trying to change her relationship with work for years, with a stack of self-help books and no real change. When she finally books sessions with a coach and agrees to a fortnightly check-in, she makes more progress in three months than in the previous three years.

Try this:

Think of one person who has already made the kind of change you want, and ask them how they did it.
Set up a recurring check-in with someone, even if it is just fifteen minutes every other week.
If you are struggling with your mental health, a qualified professional is the right guide. Consider seeking one out.

Integrate: turn insight into small, repeated actions

A recurring theme in the book is that the experience is only the beginning. Therapists in the trials spend considerable time on what they call integration: talking through what came up, working out what it means, and translating it into changes in everyday behaviour. Without that step, even a profound session can fade into a pleasant memory.

Everyone has had a smaller version of this. You come back from a holiday or a good conversation or a long walk with a flash of clarity, and by Wednesday it has evaporated. The insight was real. It just never got anchored to anything.

Example: After a weekend away, Leo is full of resolve about spending less time on his phone in the evenings. Before the feeling fades, he writes three sentences about what he realised, picks one ten minute habit (phone charges in the hallway at nine), and puts a reminder in his calendar to review it in a week.

Try this:

Write down your insight within 24 hours, in plain words and in your own voice.
Choose one tiny action that follows from it, small enough that you cannot reasonably skip it.
Schedule a check-in for seven days later, and tell someone what you are trying.

Stay curious and sceptical at the same time

Pollan is a journalist first, and one of the book’s strengths is how openly he handles his own doubts. He is fascinated by the research and moved by the stories, but he keeps pointing out the limits: the trials are small, the effects are hard to blind, the risks are real, and there is a lot of excitement, and some money, behind the field. He wants to be open without being gullible.

That balance is the real skill behind changing your mind well. Being open means you can update your views when something new comes along. Being sceptical means you ask who is saying it, what the evidence is, and what could be wrong with it. Pollan also leans on the image of the mind as a garden: something you tend over time, rather than fix once.

Example: Nina reads a breathless article about a new wellness trend. Before sharing it, she asks four questions: who is making this claim, how large was the study, what is the downside, and what would change my mind? Two minutes later she has gone from excited to appropriately interested, which is a much better place to make decisions from.

Try this:

Use the four questions above whenever you meet a big claim, in this book or anywhere else.
Keep a short running list titled “Things I’ve changed my mind about”. It is surprisingly motivating.
Once a quarter, review one firmly held belief and ask whether you would still choose it today.

A 7 Day Starter Plan

Ten tips can feel like a lot. If you would rather start small, here is a simple week that borrows from each of them without asking you to overhaul your life. Treat it as an experiment, not a test.

Day 1: Notice. Spend the day jotting down any thought that repeats. Do not try to fix anything yet. You are just collecting evidence about your ruts.

Day 2: Quiet. Do ten minutes of meditation or mindful walking, and keep your phone out of reach for the first twenty minutes after you wake.

Day 3: Freshen. Change one routine. Take a new route, sit somewhere different, or eat one meal with full attention and no screens.

Day 4: Prepare. Pick one thing that matters this week, such as a conversation or a piece of work, and decide on your mindset and your setting before you go in.

Day 5: Awe. Go somewhere that feels big, or listen to a piece of music all the way through with nothing else competing for your attention.

Day 6: Reflect. Write the letter from your ninety-year-old self. Ask what they would most want you to do next.

Day 7: Integrate. Look back over the week. Write three sentences about what you noticed, choose one small habit to keep, and tell someone about it.

At the end of the week, do not ask whether your life has changed. Ask what you noticed. The point of the plan is to build the habit of paying attention, because that is the part that compounds.

Putting It Together: A Month in One Person’s Life

It can help to see how several of these ideas combine. Here is a composite example of how one person, Rosa, a 38 year old project coordinator who feels permanently on edge, might use them over a month. She is not a real person, but her situation will probably feel familiar.

Week one: noticing. Rosa keeps a note on her phone and logs every time she catches herself replaying a conversation or bracing for bad news. By Friday she has fourteen entries, and twelve of them involve the same worry: that her manager is quietly disappointed in her. That is her rut.

Week two: quieting and freshening. She starts a ten minute walk at lunch with no phone, and she swaps her usual commute playlist for silence twice a week. She does not feel transformed, but she notices that the worry has slightly less grip when she has just been outside.

Week three: set and setting, plus a guide. Rosa decides to ask her manager for feedback directly. She chooses a quiet room and a morning slot, writes down one sentence about what she wants to hear, and mentions the plan to a friend who agrees to check in afterwards. The conversation is uncomfortable, but the feedback is far kinder than the story in her head.

Week four: integrating. That evening she writes down what she learned, which is that her prediction was wrong, and picks one habit: when the worry returns, she will say, “I’m having the thought that she is disappointed in me,” and then check the evidence. A week later she reviews how it went.

Nothing here is dramatic. There is no single breakthrough moment. But a month in, Rosa has a clearer picture of one of her ruts, a few tools for loosening it, and some real evidence that her mind’s predictions are not always reliable. That is how most real change tends to look: quiet, cumulative and a bit unglamorous.

Journal Prompts and Discussion Questions

If you are reading this as part of a book club, or just want to keep thinking after you close the page, these questions are a good place to start.

Which of your own thought patterns feels most like a rut, and when did it first form?
When did you last feel genuine awe, and what were you doing at the time?
What does your ideal set and setting look like for the conversations that matter most to you?
Where in your life are you trying to change entirely on your own, and who could act as a guide?
Pollan balances enthusiasm with scepticism. Where do you tend to lean, and what would it take to hold both?
What is one belief you hold firmly that you would be willing to test this month?

Why This Approach Actually Works

What makes How to Change Your Mind land so differently from the usual self-improvement book is that it starts from a genuinely interesting question and follows it wherever it leads. It does not promise a quick fix. It shows you a mind as a living system that can become rigid over time, and then offers some ideas for how to loosen it.

The tips above are not a replacement for the experiences Pollan describes, and they are not meant to be. They are simply the portable parts: noticing your ruts, quieting the noise, seeing the familiar with fresh eyes, making deliberate choices about your mindset and surroundings, seeking out awe, holding your ego more lightly, taking mortality seriously, getting good support, anchoring insights in action and staying both curious and sceptical.

None of that is dramatic. All of it is available to you today. And over time, that kind of steady practice might just do what the title promises.

Key Terms at a Glance

Default mode network (DMN): A set of brain regions most active when your mind wanders, ruminates or thinks about the self.
Ego dissolution: A temporary loss of the sense of being a separate, bounded self.
Reducing valve: Huxley’s image for the brain’s filtering of experience down to what is practically useful.
Set and setting: The mindset a person brings and the physical and social environment around them.
Entropic brain: Carhart-Harris’s idea that a healthy brain is ordered, and that too much order can become rigidity.
Integration: The process of making sense of an experience and turning its lessons into lasting changes in daily life.
Psychedelic: A word coined by Humphry Osmond, meaning mind-manifesting.

Who Should Read This Book

This is not only a book for people interested in psychedelics. It will suit anyone who is curious about how the mind works and why change is so hard. Readers who enjoyed the science of habit, attention and mindset will find a lot here, as will anyone who likes long-form journalism that takes its time and is honest about what it does not know.

It is also a good fit for people who are sceptical. Pollan starts from a position of doubt himself, and he spends a lot of the book testing his own assumptions. If you pick it up expecting a sales pitch, you will be surprised by how balanced it is.

If you are currently struggling with your mental health, treat the book as background reading rather than a roadmap, and speak to a qualified professional about what might help you.

Key Takeaways in Five Lines

Adult minds run on well-worn ruts, which makes them efficient but sometimes stuck.
The default mode network is closely linked to the sense of self, and to rumination.
Mindset and environment shape experience far more than we usually admit.
Guidance, preparation and follow-up matter as much as the experience itself.
Openness and scepticism work best together.

If You Enjoyed This, Read Next

The Doors of Perception by Aldous Huxley: The short 1954 essay that gave the world the idea of the brain as a reducing valve. Pollan engages with it throughout.
The Craving Mind by Judson Brewer: A neuroscientist’s account of how habits, craving and the default mode network connect, with a strong focus on mindfulness.
Atomic Habits by James Clear: A practical companion on how small, repeated actions reshape the ruts we live in.
Think Again by Adam Grant: A closer look at why we resist updating our beliefs and how to get better at it. It pairs neatly with Pollan’s themes of rigidity and openness.

Part Two

The Companion Guide

A timeline, a cast of characters, a section by section reading guide, deeper notes on every tip, a 30 day practice plan, worksheets, and a bonus quiz.

How to Use This Companion Guide

Part Two is a toolkit rather than a straight read from start to finish. Depending on how much time and energy you have, here are three ways to use it.

The one hour skim. Read the timeline, the who’s who and the one page cheat sheet. Then pick a single tip from Part One and try it today. This is the right choice if you are short on time or are simply curious.

The weekend deep dive. Work through the section by section reading guide alongside the book, or alongside Part One if you have not read it. Then read the going deeper notes for the three tips that appeal to you most, and complete one or two of the worksheets.

The 30 day course. Use the 30 day practice plan as your spine. Keep the worksheets handy, dip into the going deeper notes when you hit an obstacle, and use the journal prompts on days when you want something extra to reflect on. Finish with the quiz to see how much has sunk in.

For groups. If you are running a book club, a team session or a podcast episode, the discussion guide, the scenarios and the myths and realities table give you plenty of material for one or two sessions.

Whichever route you choose, treat it as an experiment. You are not trying to get everything right. You are trying to find out, by paying attention, which practices make a difference in your own life.

A Timeline: From Sacred Mushrooms to the Modern Lab

Pollan’s story spans centuries of human history, but the modern chapter happens surprisingly fast. This timeline pulls out the dates that matter most, so you can see how the pieces fit together.

When	What happened
1938	The Swiss chemist Albert Hofmann first synthesises LSD while working at the pharmaceutical company Sandoz.
1943	Hofmann discovers its effects after accidentally absorbing a small amount, and deliberately investigates further.
1954	Aldous Huxley publishes The Doors of Perception, bringing the subject to a literary audience.
1957	R. Gordon Wasson’s article on a Mexican mushroom ceremony appears in Life magazine. Humphry Osmond coins the word “psychedelic”.
1950s to early 1960s	Researchers explore LSD and psilocybin in psychiatry, including work on alcoholism, anxiety and the experience of dying.
1960s	Timothy Leary and Harvard become a lightning rod. The compounds spread into the counterculture, and a backlash builds.
1970	In the United States, the Controlled Substances Act places LSD and psilocybin in the most restrictive category of drugs.
1970s to 1990s	Research is largely frozen. For roughly a generation, it is almost impossible to study these substances.
2006	Researchers at Johns Hopkins publish a landmark study on mystical-type experiences with psilocybin.
2010s	Imperial College London publishes brain imaging work. Johns Hopkins and NYU run therapy trials with people facing cancer, addiction and depression.
2018	Pollan publishes How to Change Your Mind.
2022	A documentary series based on the book is released.

A note on timing: the research and the legal picture have continued to move since the book came out, and they differ from country to country. If you want the current position where you live, check an up to date, reputable source rather than relying on any book or blog, including this one.

Who’s Who in the Book

Pollan’s cast of characters is large. Here is a quick guide to the people you are most likely to want to keep track of.

Gordon Wasson: A New York banker and amateur mycologist whose 1957 Life magazine article introduced millions of Americans to the idea of sacred mushrooms.
Maria Sabina: The Mexican healer who led Wasson through a mushroom ceremony. Her story is part of the book’s reflection on how outsiders have treated traditional practices.
Albert Hofmann: The Swiss chemist who first synthesised LSD and discovered its effects, and who spent much of his life reflecting on what he had found.
Aldous Huxley: The novelist and essayist whose book The Doors of Perception, and the idea of the brain as a reducing valve, set the terms for decades of discussion.
Humphry Osmond: The psychiatrist who coined the word “psychedelic” and was an early researcher of these compounds in treating alcoholism.
Timothy Leary: The Harvard psychologist who became a symbol of the 1960s counterculture. His role in the story is both pivotal and controversial.
Paul Stamets: A mycologist who has written extensively on mushrooms. He guides Pollan through the world of fungi in the natural history chapter.
Roland Griffiths: A researcher at Johns Hopkins whose studies helped restart serious scientific work on psilocybin and mystical-type experience.
Robin Carhart-Harris: A researcher at Imperial College London, known for brain imaging work and for the idea that a healthy adult brain can become too rigidly ordered.
Anthony Bossis and Stephen Ross: Researchers at NYU who worked on trials with people facing cancer-related distress.
Matthew Johnson: A Johns Hopkins researcher associated with early work on helping people quit smoking.

You do not need to memorise the names. If you remember one idea from each, you will be able to follow the argument: Wasson for the rediscovery, Huxley for the filter, Leary for the backlash, Griffiths for the restart and Carhart-Harris for the ruts.

The Book Section by Section: A Reading Guide

Pollan’s book is organised into a prologue, six chapters and an epilogue. If you are reading it alongside this guide, or using it for a book club, the following notes give you a map for each part: what it covers, the idea worth holding on to, and a few questions to chew on.

Prologue: A New Door, and A Renaissance

What it covers. Pollan sets the scene. He explains how a subject he had never felt drawn to came to fascinate him, introduces the modern revival of serious research, and raises the question that drives the whole book: can an adult mind that has grown set in its ways be changed?

The idea to hold on to. The surprising thing about this story is not that the compounds exist but that serious science had been shut out of the conversation for so long.