The Secret Teaching of Dr Caroline Leaf

Unless you’ve lived under a rock for the decade, “The Secret” is no secret.  We’ve all heard of the book or the movie, or the countless gurus that promote how they’ve made millions of dollars and found untold happiness by unlocking the power of the Law of Attraction.  You can have that same success too if you buy their book or attend their seminar, or sign up to be part of their network marketing scheme.

Let’s be honest, we’ve probably all, at some point, indulged someone telling us that we just need to think positive or visualise our goal and it will be ours.  It’s even something that many preachers over the years have sold to us in various guises, like hyper-faith, name it and claim it, sowing your seed.

The Secret claims that if we understand we’re all energy, one with the universe and its power, then we can leverage that power to create or receive anything we want with our thoughts.  We just need to think positively and visualise it.  It’s a repackaging of the human potential movement, new age philosophy and cosmic consciousness, all of which is a repackaging of pantheism and Eastern religious teaching.

The author, Rhonda Byrne, (who I’m embarrassed to say is Australian) wrote, “If you’re feeling good, it is because you are thinking good thoughts.”  Ok, but what about when you’re thinking good thoughts and you still feel bad?  What exactly are ‘good thoughts’ anyway?

She also wrote, “Remember that your thoughts are the primary cause of everything.”  So the rise of ISIS is because of my thoughts.  Donald Trump might be President … my thoughts.  An oceanic tectonic shift cuts the undersea trunk line taking out the internet for half the eastern seaboard … Sorry, my bad, I was having negative thoughts again.

So The Secret really doesn’t make a lot of objective sense.  I could go on, but it’s been taken down well enough by a number of commentators and critics over the last decade or so (;, so I’m not going to reinvent the wheel.  But suffice to say, The Secret fundamentally sells the power of thought to shape our reality … wait, that sounds oddly familiar.  Dr Leaf said the same thing at TD Jakes’ church, the Potter’s House, only this week.


@bishopjakes proudly shared this Instagram post which Dr Leaf duly forwarded to her adoring fans.  “You can shape your reality by the way you think” was even the title of her message.  (She followed it up with an e-mail to her subscribers saying the exact same thing …)


Dr Leaf’s teaching is eerily similar to The Secret in many other ways.  That quote from before: “Remember that your thoughts are the primary cause of everything” sounds remarkably similar to “Thoughts influence every decision, word, action and physical reaction we make.” (Who Switched Off My Brain, p13)

There are lots of others.  From The Secret:

“Everything else you see and experience in this world is effect, and that includes your feelings. The cause is always your thoughts.”

“Every thought of yours is a real thing – a force.”

“Everything else you see and experience in this world is effect, and that includes your feelings. The cause is always your thoughts.”

“Food cannot cause you to put on weight, unless you think it can.” (This one made me giggle more than the others … yep, those three bottles of Coke I just drank have absolutely no effect on my waistline because I believe that excessive soda consumption is slimming …)

“Your imagination is an extremely powerful tool.”

“Quantum physicists tell us that the entire universe emerged from thought!”

“Quantum physics … says that you can’t have a universe without mind entering into it, and that the mind is actually shaping the very thing that is perceived.”

“The amazing work and discoveries of the quantum physicists over the last eighty years has brought us a greater understanding of the unfathomable power of the human mind to create.”

“Thoughts are magnetic, and thoughts have a frequency. As you think thoughts, they are sent out into the Universe, and they magnetically attract all like things that are on the same frequency. Everything sent out returns to the source – you.”

“There are no limits to what you can create for you, because your ability to think is unlimited!”

Compare that to just a small sample of Dr Leaf’s work:

“Our mind is designed to control the body, not the other way around.  Matter does not control us; we control matter through our thinking and choosing.” (Switch On Your Brain, p33)

“Research shows that 75 to 98 percent of mental, physical and behavioral illness comes from ones thought life.” (Switch On Your Brain, p33)

“DNA actually changes shape according to our thoughts.” (Switch On Your Brain, p35)

“Whatever you are thinking about affects every cell in your body.” (Switch On Your Brain, p94)

“Everything you do and say is first a thought in your physical brain.  You think, then you do, which cycles back to the original thought, changing it and the thoughts connected to it in a dynamic interrelationship.  If your thinking is off … then your communication though what you do and say is off, and vice versa.” (Switch On Your Brain, pp98-99)

“Quantum theory converts science’s conception of humans from being mere cogs in a gigantic, mechanical machine to being freethinking agents whose conscious, free choices affect the physical world.” (Switch On Your Brain: p120-1)

“Thought signals seem to move faster than the speed of light and in ways that classical physics cannot explain.  This means our mind controls matter, and is therefore a creative force.” (Switch On Your Brain, p121)

“These statistics show that the mindset behind the meal – the thinking behind the meal – plays a dominant role in the process of food-related health issues …” (Think and Eat Yourself Smart, p84)

The only difference between The Secret and Dr Leaf’s ministry is Dr Leaf’s claim that science and scripture support it, though lexical contortions of scripture, and cherry-picked pseudoscience does not qualify as supporting evidence.

In the last ten years since The Secret was published, many critics have lined up to pull it apart, some prominent Christians included.  So they should, because The Secret is an abhorrent, unscientific concoction of new age humanism, or as one critic astutely put it, “spiritual narcissism”.

I’ve dissected Dr Leaf’s teaching over the last three-and-a-bit years and shown that her science is wanting, and her scripture is tenuous.  As this week’s sermon aptly demonstrates, Dr Leaf’s teaching appears to be a lukewarm re-serving of The Secret, sprinkled with some scripture and pseudoscience to try and make it more palatable for the Christian church.  Despite the shared narratives of self-obsession and magical thinking, the Christian church still fawns over Dr Leaf.  It’s embarrassing to see the same Christian leaders and media outlets lambaste The Secret but unquestioningly accept the same message woven through Dr Leaf’s teaching.  Dr Leaf’s teaching is so close to The Secret I’m surprised Rhonda Byrne hasn’t asked for royalties.

“The only thing necessary for the triumph of evil is for good men to do nothing”.  The same goes for ignorance—the only thing necessary for the triumph of ignorance is for smart men (and women) to do nothing.  We also need consistency.  Rejecting The Secret but accepting the same teaching from Dr Leaf creates a cultural cognitive dissonance amongst the Church that’s unhealthy.

Church, it’s time to stand against mistruth no matter what the source.


Byrne, R., The Secret, Atria Books, New York. 2006 ISBN 978-1-58270-170-7

Leaf C., Who Switched Off My Brain? Controlling toxic thoughts and emotions. 2nd ed. Southlake, TX, USA: Inprov, Ltd, 2009.

Leaf C.M., Switch On Your Brain: The Key to Peak Happiness, Thinking, and Health. Grand Rapids, Michigan: Baker Books, 2013.

Leaf C.M., Think and Eat Yourself Smart. USA: Baker Books, 2016.

Dr Caroline Leaf – Not a mental health expert


Dr Caroline Leaf is a communication pathologist and self-titled cognitive neuroscientist.  She wrote a PhD on a learning program developed for an educational setting.  She is not a medical doctor.  She is not a psychologist.  She has no experience or training in the diagnosis and management of mental illness.  She is no more qualified to give advice on mental illness than my hairdresser is.

And it shows in her latest social media post: “Lets really start loving as a church- true unconditional non judgmental love – pushing people away and locking them up and drugging them against their will is not the solution to the the problems of life.”

Her statements is a nonsense, nothing more than a scarecrow fallacy.  Yes, pushing people away and locking them up and drugging them against their will is not the solution to the problems of life, that’s why no one does it.  If people were locked up or drugged against their will because of “the problems of life” then we’d all be locked up and drugged.

The only people that are forcibly treated are those with the most serious of mental illnesses whose condition has deprived them of the insight they need to make the decision for themselves.  Even then, the consent for treatment is given by the next of kin, and if no next of kin can provide consent, then the consent is usually made by a independent statutory body so there’s no conflict of interest.

That Dr Leaf continues to make such inane statements about mental illness confirms that she is not fit to give the church, or anyone else for that matter, any advice on mental health.  She may have a PhD in communication pathology but that is a highly specialised field that doesn’t even begin to cross over to clinical knowledge of mental illness.

Dr Leaf has chosen to fill her vacuum of mental health experience with the opinions of Mad In America, a group that’s irrationally biased against modern mental health care.  She regurgitates their creed almost verbatim – mental illness is over diagnosed, psychiatric medications are useless and dangerous, and Dr Leaf also claims that psychiatric medications are only prescribed to bring the cabal of the American Psychiatric Association and the pharmaceutical companies more power and money.

Psychiatric medications are more helpful than harmful (Leucht et al, 2012, Torniainen et al, 2015).  I’ve discussed this in blog posts in the past.  Yes, they’re not without their side effects, and they’re not for every patient, but they have their place in psychiatric care.  That Dr Leaf can’t or won’t review this evidence is just another indictment against her ministry.  That she actively promotes the idea that pharmaceutical companies and the APA are actively attempting to harm people for their own power and riches is scandalous.

If Dr Leaf was serious about promoting good mental health through the church, she should stop promoting baseless anti-psychiatric propaganda, and start encouraging Christians with mental illness to seek the best treatment available, whether that be medications or counselling or both.  She should also start teaching the church the truth about mental illness … That mental illness isn’t caused by poor choices or toxic thoughts, but because of genetic abnormalities that make the affected persons brain more vulnerable to external stress.

Because to stop turning pain and trauma into shame, anger, fear and then hate, people need correct information to allow them to offer real loving understanding and nonjudgmental support to move through the pain.  At the moment, Dr Leaf isn’t offering the church anything even close to that.


Leucht S, Tardy M, Komossa K, et al. Antipsychotic drugs versus placebo for relapse prevention in schizophrenia: a systematic review and meta-analysis. Lancet 2012 Jun 2;379(9831):2063-71.
Torniainen M, Mittendorfer-Rutz E, Tanskanen A, et al. Antipsychotic treatment and mortality in schizophrenia. Schizophrenia bulletin 2015 May;41(3):656-63.

Dr Caroline Leaf and those three little words


Dr Caroline Leaf, communication pathologist and self-titled cognitive neuroscientist, broke the most fundamental rules of both science and Christian teaching in her social media post today.

“Mind creates matter!  Read James 1:2”

Dr Leaf’s statement not only violates the laws of physics, but it also contradicts the Bible by elevating the human mind to the level of God himself.

  1. In our physical universe, matter, like energy, is conserved. It can not be created or destroyed.  The amount of matter that goes in to a chemical reaction is the same amount at the end of a chemical reaction.  Suggesting that our mind ‘creates’ matter violates this basic law known by every high school chemistry student.
  2. There are only two explanations for the creation of matter – the Big Bang or God’s creation. Most Christians believe the second explanation, that God was the only being to create matter which he did during the six days of creation.  By saying that our minds create matter, Dr Leaf is saying that our minds have the same amount of power that God does, a suggestion that’s incongruent with basic Biblical truth.

So much for being a scientific and Biblical expert.  In just three little words, Dr Leaf manages to violate the most basic principles of science and Christianity.

To add salt to the wound, Dr Leaf tries to justify her unscientific heresy by referencing James 1:2, as if tagging a scripture will somehow vindicate her.  Except James 1:2 says, “My brethren, count it all joy when you fall into various trials”.  Well, that’s awkward … James 1:2 has nothing to do with matter or the mind.

Her meme is just as irrelevant and unscientific.

“When we ‘rejoice despite the circumstances’, the brain responds by secreting neurotransitters that help us cope.”

Ummm … the brain does everything by releasing neurotransmitters.  That’s how the brain works.  It releases neurotransmitters when awake or asleep, active or resting.  There are no specific neurotransmitters just for coping, or for when we ‘rejoice despite the circumstances’.   Her statement is meaningless.

There would many in Dr Leaf’s camp that would try and defend her statement by claiming that it was a poor choice of words perhaps, or that it was meant to be taken metaphorically not literally.  Sure, if that’s how you want to continue to delude yourself, then be my guest, but really there isn’t much wriggle room here.  How else can you interpret the words ‘create’ and ‘matter’?  You can’t really misrepresent it as matters of fact, or matters of law, or a state of affairs.  Dr Leaf meant it as the mass noun form of the word, “physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass”.  And the word ‘create’ … we all know the meaning of that word, “to bring (something) into existence”.  It wouldn’t make any sense to say that the mind causes matter to happen as a result of one’s actions, or that the mind invests matter with a title of nobility.  It might be common to metaphorically say, “mind over matter” but there’s no metaphorical meaning for “mind creates matter”.

And so with just three little words, Dr Leaf contradicts the most basic of all principles of science and Christianity, and aptly demonstrates the irreconcilable deviation of her teaching from reality.  She has shown how willing she is to take an irrelevant scripture and try to use it to justify a misguided pseudoscientific proclamation.  Today’s meme calls her claim as a Biblical and scientific expert into serious question.

Dr Caroline Leaf and the Maligned Master Mind Meme


On Facebook today, Dr Leaf published a menagerie of memes, a full house of five of her favourite little nuggets of wisdom that comprise the pillars of her teaching.  For example, “Everything you first do and say is first a thought.” And, “You alone are responsible and can be held responsible for how you react to what happens in your life: your future is open, filled with an eternity of possible situations and choices.”  Too bad that our genes, which are not the result of our choices, are the biggest influence of our personality and our capacity to cope with our external environment (Vinkhuyzen et al, 2012), and that we often do and sometimes say things without thinking (

But the most interesting meme in today’s trick is “The mind controls the brain … the brain influences but does not control the mind.”

For years, Dr Leaf has taught that the mind is separate from and controls the brain through social media and through her books.  Take a meme she posted to social media in May 2016.  It said, “As triune beings made in God’s image, we are spirit, mind (soul) and body – and our brain being part of the body does the bidding of the mind …”, and “God has designed the mind as separate from the brain. The brain simply stores the information from the mind and your mind controls your brain.”

With the weight of scientific evidence bearing down on her, Dr Leaf has finally given a little and made a concession.  Now the brain influences, but is still controlled by, the mind.

While it’s a step in the right direction, Dr Leaf’s meme is still wrong.  It doesn’t matter what small changes Dr Leaf makes to the window dressing of her teaching, her ministry is so structurally unsound that it’s derelict.

This is because the mind is a product of the brain.  Yes, the brain influences the mind, because the brain creates the mind.  Actual neuroscientists like Professor Bernard Baars in collaboration with mathematician and computer scientist Professor Stan Franklin have shown that the mind is simply a small projection of a much greater stream of unconscious brain activity (Baars and Franklin, 2003; Franklin, 2013; Baars, 2005)

The relationship of the brain to the mind is a little like the relationship of our cars dashboard to the engine.  We don’t see all of the actions of the engine under the hood of our car, but it powers our car nonetheless.  What we do see is the dashboard.  We can see our speed, and depending on the make and model of the car you drive, the dashboard also shows the engine temperature, revs, fuel and the warning lights for our engine and our electrics.

In the same way, our brain powers us.  It’s the engine purring along under the surface.  Our mind is the dashboard, giving us a tiny glimpse at a much greater process underneath the surface.  Suggesting that our mind is in control of our brain is like suggesting that our dashboard is in control of our engine.  The mind is a product of our brain designed to give us conscious awareness of a small portion of a much deeper stream of activity that senses our environment, alters our moods, plans our actions and then executes them.

By basing her entire ministry on such science fiction, Dr Leaf makes a mockery out of every church that hosts her, of everyone that buys her books, and of everyone who subscribes to her programs.  She also makes a mockery of herself, which is the saddest part of this whole story.  I hope that she stops making changes to the window dressings of her ministry, and starts to make the necessary changes to her foundations before it’s too late and the whole thing comes crashing down.


Baars, B.J., Global workspace theory of consciousness: toward a cognitive neuroscience of human experience. Progress in brain research, 2005. 150: 45-53

Baars, B.J. and Franklin, S., How conscious experience and working memory interact. Trends Cogn Sci, 2003. 7(4): 166-72 ;

Franklin, S., et al., Conceptual Commitments of the LIDA Model of Cognition. Journal of Artificial General Intelligence, 2013. 4(2): 1-22

Vinkhuyzen, A.A., et al., Common SNPs explain some of the variation in the personality dimensions of neuroticism and extraversion. Transl Psychiatry, 2012. 2: e102 doi: 10.1038/tp.2012.27

60 seconds – Dr Leaf and Anxiety

Screen Shot 2016-08-22 at 9.32.03 PM

Dr Caroline Leaf, communication pathologist and self-titled cognitive neuroscientist, says that “A chaotic mind filled with rogue thoughts of anxiety and worry sends out the wrong signals and affects you right down to the level of your DNA!” She also says that “Toxic thinking destroys the brain!”

In other words:

Anxiety → Toxic thought → DNA changes +  Brain damage

But that’s not what science says. According to modern research, anxiety disorders are the result of a genetic predisposition to increased vulnerability to early life stress, and to chronic stress [1]. The other way of looking at it is that people who don’t suffer from anxiety disorders have a fully functional capacity for resilience [2,3].

In other words:

DNA changes + External stress → Anxiety

Dr Leaf’s teaching is backwards. Perhaps it’s time she turned it around.


[1] Duman EA, Canli T. Influence of life stress, 5-HTTLPR genotype, and SLC6A4 methylation on gene expression and stress response in healthy Caucasian males. Biol Mood Anxiety Disord 2015;5:2
[2] Wu G, Feder A, Cohen H, et al. Understanding resilience. Frontiers in behavioral neuroscience 2013;7:10
[3] Russo SJ, Murrough JW, Han M-H, Charney DS, Nestler EJ. Neurobiology of resilience. Nature neuroscience 2012 November;15(11):1475-84

Dr Leaf and Anxiety

Can you really Think and Eat Yourself Smart?


Today I’m in Sydney, a vibrant, bustling city which centres on one of the most beautiful harbours in the world.  When I booked my flights in April, I was originally going to spend the day attending Dr Caroline Leaf’s Australian Think and Eat Yourself Smart workshop.  Dr Leaf and her minions revoked my ticket a few weeks later.  She also changed the workshop twitter hashtag from #thinkandeatsmart to just #eatsmart, so perhaps Dr Leaf doesn’t want free thinking at the workshop.

It’s such a shame really, because I was looking forward to being part of the history of Dr Leaf’s first workshop on Australian soil.  But no matter … why waste a perfectly good plane ticket when I can have a day to sightsee, take photos, and catch a few Pokemon here and there as well.

And as a special something for all the people who’re attending the workshop today with Dr Leaf, I thought I’d pen a blog in their honour … something for them to ponder as they listen to Dr Leaf’s presentation, and maybe even provide them with a nidus of a question to pose to her during the day.  So here goes …

As the name would suggest, the Think and Eat Yourself Smart workshop is based on Dr Leaf’s book, Think and Eat Yourself Smart.  Does the book (and the subsequent workshop) deliver what it promises?  That is, can you really think and eat yourself smart?  It’s all well and good for Dr Leaf to espouse her fringe opinions on the food industry and modern farming, and to recycle nutritional information that doctors and dieticians have been promoting for years, but if her book can’t deliver on its titular promise, then it’s just an unoriginal rehash.

To support her thesis that we can think and eat ourselves smart, Dr Leaf declares that what you think affects what you eat, and what you eat affects what you think.  It’s on these intertwined ideas that Dr Leaf’s book stands or falls.  Let’s look at those statements in more detail.

Statement number 1 – “What you think affects what you eat”

Dr Leaf has a broad approach with this premise.  She suggests that the mindset that you have will not only determine what you consume, but also how your body will process it.

For example, she said on page 84 of Think and Eat Yourself Smart, “Research shows that 75 – 98 percent of current mental, physical, emotional and behavioural illnesses and issues come from our thought life; only 2 – 25 percent come from a combination of genetics and what enters our bodies through food, medications, pollution, chemicals, and so on.  These statistics show that the mindset behind the meal – the thinking behind the meal – plays a dominant role in the process of human food related health issues, approximately 80 percent.  Hence the title of this book: you have to think and eat yourself smart, happy and healthy.”

She goes on to say, “If we do not have a healthy mind, then nothing else in our life will be healthy, including our eating habits.”

We can break down these statements to assess their validity.

First of all, this statement is predicated on her 98 percent myth, something which I’ve previously proven to be implausible, but which Dr Leaf continues to use despite the overwhelming evidence against it.  To arrive at this conclusion, Dr Leaf has over-extrapolated, paraphrased, and exaggerated a handful of sources that were either out-of-date, clearly biased, or irrelevant.  She even had the gall to ascribe a made-up figure to an article which, ironically, twice contradicted her.  If you want to know more, see Chapter 10 in my book (

This means that Dr Leaf’s statement, and indeed, her entire book, is built on gross misrepresentations of illegitimate resources.  Genetics and our external environment actually play a much greater role than she is willing to give credit for.  The mindset behind the meal is largely irrelevant – nowhere near 80 percent as Dr Leaf suggests.

But for the sake of argument, let’s take a couple of well-known medical conditions that are often associated with lifestyle and compare the research examining the difference that thinking and food make to them.  After all, if your mindset really is responsible for more than 80 percent of our health, then these two very common conditions should improve by more than 80 percent when thought patterns are changed.

Example 1: Hypertension.

Hypertension is also known as high blood pressure.  First, a brief explanation of what the numbers mean when talking about blood pressure so we’re on the same page: Blood pressure is measured in units of millimetres of mercury (or mmHg).  The old sphygmomanometers were hand pumps attached to a rubber bladder and a column of liquid metal mercury.  The blood pressure reading was however high the column of mercury rose at the two ends of the cardiac cycle.  There are always two numbers, expressed as ‘number 1 over number 2’ and written as N1/N2, like 120/80 or ‘one hundred and twenty over eighty’.  The top number is the maximum pressure in the arterial system when the heart pumps the blood into the arteries.  The bottom number is the pressure left over in the arterial system just before the heart beats again.  A blood pressure of 120/80 is the gold-standard physiological reference of normal blood pressure.  A blood pressure consistently above 140/90 is considered high.

Primary hypertension, which accounts for about 95 percent of all cases, has a strong genetic component.  According to eMedicine, “Epidemiological studies using twin data and data from Framingham Heart Study families reveal that BP has a substantial heritable component, ranging from 33-57%.” (  Environmental causes account for nearly all of the rest.  Secondary hypertension is related to a number of different diseases of the arteries, kidneys, hormone system and many others.  Diet is clearly part of those environmental causes.  Psychological stress is in there too, but the question is, how important is it?  If Dr Leaf is right, it should be 80 percent.

According to medical research, reducing alcohol intake to one standard drink per day or less reduces the systolic blood pressure (the top number) by between 2 and 4 mmHg.  Reducing salt to less than 6g a day decreases the systolic blood pressure by between 2 and 8 mmHg.   At best, that’s a 12mmHg reduction.  The DASH diet is as close to Dr Leaf’s macrobiotic tree-hugging anti-MAD diet as one could reasonably get, relying not just on cutting out salt, but also consuming low fat milk and lots of fruit and vegetables.  At best, the DASH diet could shave another 6mmHg from the standard low salt diet.  So that’s a grand total of 18mmHg with even the most optimistic of expectations.

Compared to diet, the best improvement in blood pressure from mind control is 5mmHg at best (and given the size and quality of the studies, that’s being generous) (Anderson et al, 2008; Barnes et al, 2008).

So for hypertension, changing your thinking has, at best, only about a quarter as powerful as changing your diet, not four times more powerful as Dr Leaf would have us believe.  One more nail in in the coffin for Dr Leaf’s theories.

Example 2: Dyslipidaemia.

Dyslipidaemia is medical jargon for cholesterol behaving badly.  Cholesterol is a waxy substance that’s found as a component of the fats in our diet.  To simplify a complex process, we need cholesterol to make our cell membranes, and cholesterol is also an essential building block for most of our hormones.  Cholesterol is usually carried around the body on protein transports called lipoproteins.  If there’s over-production of these lipoprotein particles or they’re not cleared by the liver properly, then the cholesterol they carry can get up to mischief.  The pathways and means of lipid metabolism in the human body reflect complex processes, and genetics, certain medical conditions, medications, and environmental factors can change how the lipoproteins behave.

So how much does thinking affect our cholesterol?  Well, there isn’t a lot of research looking at the subject, but a few studies have looked at cholesterol (specifically triglycerides, one of the lipids in the cholesterol ‘team’) and ‘mind-body practices’ (such as self-prayer, meditation, yoga, breathing exercises, or any other form of mind-body related relaxation technique or practice).  In a cross-sectional analysis of a cohort from the Rotterdam Study, Younge and colleagues examined the association between mind-body practices and the blood levels of triglyceride.  They found that mind-body practices were associated with a triglyceride level 0.00034 mmol/L less than those who did not perform mind-body practices (Younge et al, 2015).  That’s nearly imperceptible, possibly an artefact.  In fact, the average effect of placebos (the fake pills given as a control in therapeutic drug trials) are far greater – 0.1 mmol/L on average (Edwards and Moore, 2003).  Dietary interventions such as low carbohydrate diets decreased triglycerides by 0.26 mmol/L compared to low fat diets (Mansoor et al, 2016), and low fat diets up to 0.27 mmol/L lower than standard diets (Hooper, 2012).  Statins, the lipid-lowering medications, reduce triglycerides by between 0.2-0.4 mmol/L depending on the specific drug studied (Edwards and Moore, 2003).

The point of all this isn’t so much the specific numbers but the obvious difference between the (lack of) power of thought over an important lifestyle condition compared to the effectiveness of diet and medications.  If thinking was four times more important to the process of human food related health issues as Dr Leafs proposes, then thought-related ‘mind-body’ interventions should be at least four times more effective than any other intervention.  But the numbers don’t reflect that – ’Mind-body’ interventions are 1000 times weaker than dietary or drug interventions.

So Dr Leaf’s pronouncement that “the mindset behind the meal – the thinking behind the meal – plays a dominant role in the process of human food related health issues, approximately 80 percent” is complete bunkum.  There is no evidence to support the 98 percent myth which forms her statements underlying premise, and the examples of hypertension and dyslipidaemia, two common lifestyle conditions with proven genetic and dietary links, prove that thought based interventions are much, much weaker than dietary or drug interventions.

Therefore Dr Leaf’s claim that what you think affects what you eat is entirely baseless.

Statement number 2 – “What you eat affects what you think”

Dr Leaf writes, “Although your brain is only 2 percent of the weight of your body, it consumes 20 percent of the total energy (oxygen) and 65 percent of the glucose – what you eat will directly affect the brain’s ability to function on a significant scale.  Your brain has ‘first dibs’ on everything you eat.  I call this the ’20 percent factor’ or the eating behind the thinking, and it underscores the fact that how and what we eat affects our mind, brain and body.” (p84-5)

On face value, the statement seems to hold some weight.  Food does have an impact on how our brain works.  It certainly isn’t the only factor though – demands in the environment, our oxygen levels, our hormones, the function of our major organs, infections or injury, and our levels of sleep, all play a significant role on how our brain functions too.  But strictly speaking, what we eat does have an impact on how we think – if we haven’t eaten, or if we don’t consume enough calories, especially carbohydrates, our body slows some of our bodily functions down to preserve energy, including some of our cerebral functions.  So when you hear people complain that they can’t think because they have low blood sugar, that may in fact be true.  On the other hand, a pure glucose load can shift the balance of the amino acid tryptophan in our body, which enables the brain to produce more of the neurotransmitter serotonin, which can lift our mood.  Or ingesting food or drinks with stimulants like caffeine, such as my morning espresso, also improves how we think by making us more alert.

Unfortunately, Dr Leaf’s application of this premise goes several steps too far.  Later on page 85, Dr Leaf says, “if you eat while emotional, your body does not digest your food correctly.”

Well, that statement may contain an element of truth but only because it’s so hazy and indefinite that it’s applicable in the broadest sense.  Technically, we’re always emotional to one degree or another.  Even if I assume that Dr Leaf’s is meaning ‘angry’ when she says ‘emotional’ then it’s not so much that our body digests food incorrectly, but just differently.   When you’re highly aroused (physiologically, not sexually, just to clarify), your body goes into fight or flight mode.  The body diverts blood away from your intestines and towards your muscles, heart and lungs, so that you have the energy to handle the crisis.  The food in your stomach and guts isn’t going anywhere, and your body leaves it where it is to come back to it later when the crisis has been averted.  This is a normal physiological response.  The body still digests the food and absorbs it correctly, things are just delayed a little (Kiecolt-Glaser, 2010).

The biggest problem with Dr Leaf’s ‘eating behind the thinking’ argument is that it directly undermines her previous teaching.

Dr Leaf has made multiple social media posts claiming that the mind is separate from the brain and controls the brain.  She’s written much the same sentiment in her books.  Take a meme she posted to social media in May 2016.  It said, “As triune beings made in God’s image, we are spirit, mind (soul) and body – and our brain being part of the body does the bidding of the mind …”, and “God has designed the mind as separate from the brain. The brain simply stores the information from the mind and your mind controls your brain.”

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So the obvious question is, “If God designed our mind (our thinking) to be separate from the brain and to control the brain, then how can the food we eat make any difference to what we think? My diet affects my brain through the amount and timing of glucose I ingest, but can my diet can’t affect my thinking if the mind is separate to the brain and controls the brain?

Either the mind is separate to the brain, or it’s not.  It can’t be both.  If the mind is separate to the brain, then what you eat can’t affect what you think and the book becomes an emaciated shadow of rhetoric.  If the mind is dependent on the brain then the book and seminar maintain some semblance of validity, but the rest of Dr Leaf’s ministry crumbles like a well-made cheesecake crust, since the entirety of Dr Leaf’s ministry rests on her idea that the mind is separate from the brain and controls the brain, not the other way around (

At the very least, this must be embarrassing for Dr Leaf, and if she keeps shooting herself in the foot, people will eventually notice that she’s limping.

So other than the free-range, fair-trade, grass fed, organic agro-ecologically produced kale and spinach root muffins and the chia and dandelion broth, it appears that the attendees at Dr Leaf’s workshop today may not be getting what they signed up for.  What you think does not radically change your health, or influence what your food does to your body, and the food you eat does not significantly change how you think.  Our diet is important to our health, but we can’t think and eat ourselves smart.

To all the attendees at the workshop, I hope you got something valuable out of the workshop.  While you were all sitting in a small room, listening to Dr Leaf and snacking on lemon and quinoa stuffed free-range quail giblets, Sydney was outdoing itself.  Not that I’m rubbing it in or anything, but see for yourself …

Kirribilli View

Dr Mary Booth lookout

Milsons Point

Milsons Point


Milsons Park, Neutral Bay

Cremorne20160820 Web


Point Piper

Point Piper

Macquarie Lighthouse

Macquarie Lighthouse

Blues Point Reserve

Blues Point Reserve

Blues Point Reserve

Blues Point Reserve


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Kiecolt-Glaser JK. Stress, food, and inflammation: psychoneuroimmunology and nutrition at the cutting edge. Psychosomatic Medicine. 2010 May;72(4):365.

Mansoor N, Vinknes KJ, Veierød MB, Retterstøl K. Effects of low-carbohydrate diets v. low-fat diets on body weight and cardiovascular risk factors: a meta-analysis of randomised controlled trials. British Journal of Nutrition. 2016 Feb 14;115(03):466-79.

Younge JO, Leening MJ, Tiemeier H, Franco OH, Kiefte-de Jong J, Hofman A, Roos-Hesselink JW, Hunink MM. Association between mind-body practice and cardiometabolic risk factors: The Rotterdam Study. Psychosomatic medicine. 2015 Sep 1;77(7):775-83.

Strong marketing can’t make up for weak ideas

Well Dr Leaf, 10 out of 10 for persistence.

Dr Caroline Leaf is a communication pathologist and a self-titled cognitive neuroscientist. In the last month or so, Dr Leaf has been hammering home her foundational belief that the mind is in control of the brain, and indeed, that your thoughts are the key to everything in life, a bit like 42 in “The Hitchhikers Guide to the Galaxy”. According to Dr Leaf, your thoughts are the answer to life, the universe, and everything.

Dr Leaf has attempted to prove her point through quotes from neuroscientists, from her own teaching, and from some published research. All she’s ended up proving is that she’s so desperate to prop up the concept that she’ll stoop to cherry-picking articles and massaging quotes. Poor form for a woman who promotes herself as a scientist.

Today’s meme is the spiritual justification of her position, expressed as a lovely little graphic with a verse from Proverbs 4:23. It’s a real Pinterest special. Most people would look at the pretty picture and accept the quote without question. It’s good marketing for sure.

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But if you strip back all of the eye-candy, is the meme still worth posting? Is Dr Leaf’s meme an accurate depiction of what Proverbs 4:23 truly means.

First things first, is the meme an accurate quote? In this case, it is. The Good News Bible really does say, “Be careful how you think; your life is shaped by your thoughts.” (

So the next question is, is the Good News version an accurate translation of the scripture? It’s interesting that nearly every other translation doesn’t mention thoughts and thinking at all:

New International Version = Above all else, guard your heart, for everything you do flows from it.
New Living Translation = Guard your heart above all else, for it determines the course of your life.
English Standard Version = Keep your heart with all vigilance, for from it flow the springs of life.
New American Standard Bible = Watch over your heart with all diligence, For from it flow the springs of life.
King James Bible = Keep thy heart with all diligence; for out of it are the issues of life.
Holman Christian Standard Bible = Guard your heart above all else, for it is the source of life.
International Standard Version = Above everything else guard your heart, because from it flow the springs of life.
NET Bible = Guard your heart with all vigilance, for from it are the sources of life.
Aramaic Bible in Plain English = Keep your heart with all caution because from it is the outgoing of life.
GOD’S WORD® Translation = Guard your heart more than anything else, because the source of your life flows from it.
JPS Tanakh 1917 = Above all that thou guardest keep thy heart; For out of it are the issues of life.
New American Standard 1977 = Watch over your heart with all diligence, For from it flow the springs of life.
Jubilee Bible 2000 = Above all else, guard thy heart; for out of it flows the issues of life.
King James 2000 Bible = Keep your heart with all diligence; for out of it are the issues of life.
American King James Version = Keep your heart with all diligence; for out of it are the issues of life.
American Standard Version = Keep thy heart with all diligence; For out of it are the issues of life.
Douay-Rheims Bible = With all watchfulness keep thy heart, because life issueth out from it.
Darby Bible Translation = Keep thy heart more than anything that is guarded; for out of it are the issues of life.
English Revised Version = Keep thy heart with all diligence; for out of it are the issues of life.
Webster’s Bible Translation = Keep thy heart with all diligence; for out of it are the issues of life.
World English Bible = Keep your heart with all diligence, for out of it is the wellspring of life.
Young’s Literal Translation = Above every charge keep thy heart, For out of it are the outgoings of life.

Nearly every other English translation refers to “the heart”. Obviously not the literal “heart”, that muscular blood pump in the middle of our chests, but the metaphoric heart, the human soul. So even on majority rules, the Good News Bible translation is looking shaky. Is there any further corroborating evidence to help us understand which version is the most correct?

The answer would be in the original Hebrew. The word for ‘heart’ in Proverbs 4:23 is לֵב (leb), and more broadly is a word relating to the soul, ‘inner man, mind, will, heart, understanding’ ( In some verses, the word in used in reference to what would be considered thoughts, but in many others, the word is used to describe a person’s feelings or motivations, or attitudes, or even specific intelligence and manual skills. For example:

Genesis 17:17: “Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?”
Genesis 42:28: “And he said unto his brethren, My money is restored; and, lo, it is even in my sack: and their heart failed them, and they were afraid, saying one to another, What is this that God hath done unto us?”
Exodus 8:32: “And Pharaoh hardened his heart at this time also, neither would he let the people go.”
Exodus 35:35: “Them hath he filled with wisdom of heart, to work all manner of work, of the engraver, and of the cunning workman, and of the embroiderer, in blue, and in purple, in scarlet, and in fine linen, and of the weaver, even of them that do any work, and of those that devise cunning work.”

So it appears the Good News Bible is actually a poor translation. Again, this is an example of Dr Leaf cherry picking something that suits her theory out of a bulk of divergent views. No matter how she tries to sell the concept, the idea that the mind controls your brain and that your thoughts control your destiny is scientifically and scripturally weak. Persistence and good marketing isn’t going to change that.