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Let me introduce myself. My name is Mark Sisson. I’m 63 years young. I live and work in Malibu, California. In a past life I was a professional marathoner and triathlete. Now my life goal is to help 100 million people get healthy. I started this blog in 2006 to empower people to take full responsibility for their own health and enjoyment of life by investigating, discussing, and critically rethinking everything we’ve assumed to be true about health and wellness...

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May 14, 2009

The Definitive Guide to Conventional Wisdom

By Mark Sisson
159 Comments

Every story needs a villain, and every protagonist needs an antagonist. Here at Mark’s Daily Apple, my regular nemesis is none other than Conventional Wisdom.

But first, let me qualify that statement. Conventional Wisdom isn’t necessarily evil. Take the current medical position on smoking. It seems like common sense to us now that inhaling superheated carcinogenic vapor on a regular basis leads to health issues, but fifty years ago, doctors swore up and down that it wasn’t harmful. They’d light up while taking your temperature, and it was common for pregnant women to enjoy a nice smoke. That was the CW regarding smoking (though I wonder what kind of moneyed interests were behind that one) for years. Eventually, the lung cancer-smoking link became undeniable, and scientists now unanimously agree that smoking is bad for your health. It took them awhile, but they did get it right, and Conventional Wisdom shifted to acknowledge this “new” reality.

That’s rare, however.

In most cases, CW is a lumbering beast: slow to move, but difficult to alter course once its big bullish head is set on moving in a certain direction. It’s the pigheaded, stubborn curmudgeon yelling at those darn kids to get off his lawn. It’s loud, pervasive, and impossible to ignore – and avoid. Oftentimes, entire careers are staked on maintaining its veracity. When that veracity is challenged, either by critics or by experiment, the challenger is often silenced. No, I’m not talking about some conspiracy theory wherein a rival scientist is snuffed out by a cabal of evil scientists. Rather, it’s that a conforming chorus of assent can be mobilized to drown out even the most rigorously defended thesis, just as long as Conventional Wisdom is at stake. The simple fact that faulty Conventional Wisdom – especially nutritional – is mostly supported by not malevolent, but altruistic and good-intentioned people is what makes it so difficult to defeat. Scientists, nutritionists, and doctors are generally convinced that the CW they support and defend is in the best interest of the population. These aren’t evil geniuses; these are good people operating from a fundamentally flawed stance.

Such a fundamentally flawed stance forms the basis for the nutritional CW that we all know and despise: the dietary fat-heart disease link. It started with Ancel Keys’ 7 Country Study, in which he examined heart disease rates in dozens of countries looking for support of his hypothesis that saturated fat intake correlated positively with heart disease mortality. He was able to put together a group of 7 countries that fit the bill – but only after discounting and excluding data points from the 14 other nations that showed little to no correlation! Keys set out to prove a previously-held position and, as is so often the case, he managed to focus only on the evidence that supported it.

Still, even the most inert, seemingly immovable consensus can change if faced with a perfect storm of insurmountable evidence, financial motivation, and unflappable criticism. The money angle is the toughest nut to crack, of course, but it’s our responsibility – as conscious skeptics of all things Conventional – to utilize the evidence and level the criticism on those who deserve it. Good intentions aside, what’s important is getting good health information out there and challenging status quos that don’t jibe with the facts.

I want to clarify something: I do so not question Conventional Wisdom because I fancy myself a contrarian for contrariness’ sake. I do it because there’s a lot of disinformation out there, horribly misguided or just blatantly false nutritional info that’s all the more dangerous simply because it has been deemed Conventional Wisdom by the omniscient “they” – who “they” are, it’s often difficult to know; just know that “they” know what they’re talking about (or so they say). If it were that crazy homeless guy outside the liquor store screaming about the dangers of a diet high in animal fats, it’d be easy to ignore. But when “they” happen to be a panel of experts in white coats hailing from important-sounding government acronyms, we tend to listen up.

CW rarely changes, but when it does, it’s generally for the better. I already mentioned the obvious example of smoking, but the Internet is making it harder and harder for unsubstantiated nutritional advice to go unchallenged. The bulk of people still get their dietary information from Oprah or the media’s cursory interpretation of the latest industry-funded study, but an increasing number of individuals are empowering themselves and others with the wealth of information available online. People no longer have to settle for a nutrition “expert’s” analysis of a particular study; they can access the same information and pull up the same abstracts and draw their own conclusions. And for those of us who might not have the tools or the time to break down each study, there are blogs like this one, or Dr. Eades’, or Conditioning Research, or Whole Health Source, or Richard Nikoley’s that do the leg work for you, making it incumbent on us to do our homework and make sure we don’t commit the same errors we criticize in the establishment. Of course, there is the fact that, though the Primal way is the right way, we cannot lose our skepticism. A new “alternative” Conventional Wisdom is emerging from the Primal/paleo/low-carb blogosphere, but it remains a vocal minority, and maintaining our intellectual rigor is crucial if we want to make an impact on society as a whole.

Like omega-3s, saturated animal fats, and brightly colored vegetables, a good-sized chunk of skepticism makes for healthy living. We have brains, big, immensely complex ones that are the products of millions of years of evolution, and we should use them. Grok didn’t rely on Conventional Wisdom; he created it. Accepting what “they” say on blind faith is tantamount to relinquishing what makes us essentially human: our ability to harness reason and logic in the pursuit of truth. At the same time, we must also probe, test, and constantly examine our own ideas.

And so, this guide does not purport to tackle every bit of misleading or false nutritional Conventional Wisdom (I think we do an adequate job of that in our regular daily posts); I simply wish to remind each and every one of you to never stop asking questions and seeking truths.

In the end, we subscribe to perhaps the most Conventional Wisdom of all – the time-tested, naturally-selected wisdom spanning hundreds of thousands of years, the wisdom, founded in the incontrovertible facts of evolutionary biology, that guided our ancestors. We may not ever change the minds of society at large, but we can make the small – or big – changes in our own lives that will ensure health, longevity, and wellness.

Prefer listening to reading? Get an audio recording of this blog post, and subscribe to the Primal Blueprint Podcast on iTunes for instant access to all past, present and future episodes here.

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159 Comments on "The Definitive Guide to Conventional Wisdom"

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J Mando
J Mando
7 years 4 months ago

The real problem is that modern conventional wisdom is no longer a simple and reliable collection of statements on how to live well, but has become a shifting, unstable dogma under the false pretense of scientific rigor. A similar thing happened to agriculture: now “conventional” agriculture means modern, chemical-intensive agriculture, while “organic” means, literally, conventional (i.e. pre-modern)…

True conventional wisdom hasn’t changed, but its impostor is slowly taking its place.

Dave in Ohio
Dave in Ohio
7 years 4 months ago

I suspect a lot of well-trained people unthinkingly accept what they read in their textbooks and espouse it as gospel.

Then there is the class of strong-willed doctors and scientists (and these are the ones that seem to end up in charge of everything) who often have over-sized egos that won’t permit them to admit it when they are clearly wrong. Can’t lose face by reversing what they’ve preached for 30 years. Even if they could admit it to themselves, such admissions could be career ending and they know it.

alanrlow
alanrlow
7 years 1 month ago

Slightly off topic but I think this comment nicely dovetails with religion too. I don’t think you will find a senior archbishop (whatever the higher ups are called) that believes their rubbish but they can’t break with tradition now and admit it and acknowledge that their entire life has been a sham.
Back on topic, a lot of doctors can’t break with CW and admit that what they’ve been espousing for years is wrong. They have to keep pushing the CW line.

Vince
Vince
6 years 2 months ago

Religion is conventional wisdom?
They are quite the opposite, actually. Instead of being tempted to throw out what they have believed for centuries in favor of “modern” thought, they stick to their guns. If they were changing all the time (like conventional wisdom), then religion WOULD be a sham.
Think before you open your mouth next time, sir.

Phillip
Phillip
5 years 8 months ago

dude…”Confronting people in real life about deeply held nutritional beliefs (about as deep-seated as religion, in fact) usually doesn’t end well. Humans have a nasty habit of clinging on to dogma all the more vigorously when it’s threatened with logic and reason.”

Aaaaaaannnnnnddddddd……you made his point.

Kyndal
Kyndal
3 years 1 month ago

I agree about the religion comment. Religion changes according to politics. I highly doubt that the senior archbishop would ever go against what they’ve been saying for years, it would be a total embarrassment. Good point.

(Religion IS a sham)

Cliff
Cliff
7 years 4 months ago
I’ve run into a lot of the people who can’t imagine going against what has been drilled into their heads for years. When I tell them I’m not eating grains anymore, it is almost incomprehensible. I’ve also been told that I shouldn’t just “jump on the next trend” or “latch on to the first thing I read that I agree with.” I’ve noticed that once they have decided I’m outside the normal limits of CW, they try and defend what they know no matter what I say. Results will speak for themselves I believe, so in a few months when… Read more »
John Walters
John Walters
2 years 17 days ago

Trends? We have been eating grains for a tiny fraction of the existence of mankind. I’d say that eating grains is a trend; still in its infancy! 🙂

Jonathan
7 years 4 months ago

When I was getting ready to make the change to a primal lifestyle I talked with my doctor about the primal lifestyle that I would rather hold off on taking the medication he was suggesting in order to try a more natural method. He threw up his arms and made a big fit then walked out of the room saying he was the doctor and if I knew better I could leave.

I did leave and I’m doing better without his prescription. I agree that ego has much to contribute to the slow change of conventional wisdom.

Ryan Denner
7 years 4 months ago

Awesome.

I remember when I read the china study, I was sold.

But then I found your website, and then I started questioning a lot of the authors studies, and how certain variables cant be controlled. He basically argued that a vegan diet is healthier than the “average” american diet. Assuming the average american diet is crap, then yes, he is right. But, i questioned his wisdom on how a vegan diet can be better than the PB diet… and I don’t think (or, know) so.

Holly
Holly
7 years 4 months ago

I don’t think its generally in human nature to admit we are wrong – particuarly if something spends years upon years studying, learning, and trying to become an expert on something. But, I do believe that when one stops questioning (whether its conventional wisdom or one’s own character/personality) then we become stagnant and can easily stop improving ourselves and the world around us. Thanks for helping us keep questioning!

SerialSinner
7 years 4 months ago
Very true! Your post makes me think of how challenging it is to keep an open mind about everything. Many things come to mind: – The sense of peace people tend to get from embracing absolute certainty. – The practicality or necessity of trusting experts (not always) in fields outside our expertise. – The growing difficulty to discern from good and bad quality sources in times where we can get anything from the internet, and where only few have the skills to assess the methodological quality of a research paper. But, at the end, I think it comes down to… Read more »
DaveC
7 years 4 months ago

Any list of sites that break down studies is incomplete if it doesn’t include Stephan’s

Katie
Katie
7 years 4 months ago

Curious, does anyone know what countries were used in the Seven Country Study and which were excluded? Every site I’ve looked at seems to want to prattle on about how Keys manipulated the data but does not list the countries he used (aside from Japan, Finland, and Crete).

erik.cisler
erik.cisler
7 years 4 months ago

Check out Peter’s post over at Hyperlipid:

http://high-fat-nutrition.blogspot.com/2009/02/cholesterol-presentation-between.html

And another interesting graph plotting saturated fat intake v. CHD, from Richard’s site:

http://www.freetheanimal.com/.a/6a00d8341d0fcc53ef01156f35e74d970b-800wi

mikibel
mikibel
7 years 4 months ago

http://high-fat-nutrition.blogspot.com/search/label/Cholesterol%20presentation%3A%20Between%20countries
look at this hyperlipid post for details of countries in keys’ study

Connie
Connie
7 years 4 months ago

Peter at Hyperlipid has a post that is close. At least you could go to the sources he cites, and finally get to the databases.

http://high-fat-nutrition.blogspot.com/search?q=keys

Greg at Live Fit
7 years 4 months ago

Some people don’t want to take the time to truly learn about health, fitness, and eating. It’s far easier to spout back the bits and pieces that support what they want to believe, than critically examine their habits and adapt their behavior. If you don’t believe this, just listen to a smoker with lung disease protest how cigarettes aren’t dangerous.

Rick S
7 years 4 months ago

Only death changes the status quo as the stubborn egomaniacs that comprise “the establishment” who cling to their nonsense in the face of contradictory evidence finally kick the bucket so that honest curiosity finally enables fresh blood to rediscover what was already discovered years before.

Wait long enough and the truth will out.

But be prepared to wait an entire lifetime. That seems to be what is required these days.

will
will
7 years 4 months ago

Wasn’t “seven countries” about total fat production in these countries and not just saturated fat?

Joe Matasic
Joe Matasic
7 years 4 months ago

I know that Colpo listed which countries were used in the Seven Nations Study and which were excluded, along with the other possible scenarios in his book: The Great Cholesterol Con. I don’t have it here with me and the power supply on laptop is shot, where I’ve got the Ebook version. I will try and look up the info this weekend if no one else posts it.

Eddie Allen
7 years 4 months ago
Great article Mark. Makes me more determined than ever to not blindly accept everything in life, across the board, not just in diet and exercise. I’m a cyclist, and cycling is chock full of false prophets espousing THE TRUTH on everything from helmets to pedals to nutrition. It takes a courage to be different in all facets of life. There are a few luminaries out there, Grant Petersen for instance, who dare to ask why? I’ve been following the PB now for 10 weeks since reading about it in the Rivendell Reader. I’ve lost 28lbs – I’m lighter now than… Read more »
Houston
Houston
7 years 4 months ago
Mark, do you really believe that the “experts” that espouse erroneous doctrines on health (and other subjects) are good, well-meaning, altruistic people. I don’t. I consider these experts compromised, malevolent and self-serving. Ancel Keys and the 7 Country Study is a perfect example. The research that proposed that smoking was not harmful was funded by big tobacco and unwitting people repeated it as if it were gospel. The “experts” and celebrities that now ask us if we “Got Milk?” are funded by big dairy and could care less if it gives the right message because they got paid. Lies, half-truths… Read more »
DaveC
7 years 4 months ago

Some people who come here for the first time are just auditioning for the choir!! I was in a kettlebell forum, oblivious to the primal blueprint and in step with CW, when I followed a link to Mark’s “Chronic Cardio” post. Now I’m an established baritone but we all gotta start somewhere!!

DKF
DKF
7 years 4 months ago
I do want to say this. It is without question that there is big money behind so-called expert advise. There is no question that there is influence and bias and *gasp* greed. However, not all experts, researchers, and scientist are a part of a cabal that feed the big money anything want to hear. Notice it is often the big money interest that twist the results to their liking outside the control of the “expert.” So much so to the ire of the “expert.” There are many well meaning researchers who perform vital work that has advanced our quality of… Read more »
rob
rob
7 years 4 months ago
Mark, I enjoy reading your blog and I agree that conventional wisdom on nutrition seems to be lacking in both convention and wisdom these days. At least in the US we have given up on traditional ways. We don’t eat the way our great-grand parents ate much less the way grok ate. While I am down with you message, in my first step I am trying to achieve a life style that is maybe more like great-grandma’s than like grok’s It seems pretty clear to me that there have been at least 2 significant changes in CW that have been… Read more »
Dr. Charles Martin
7 years 4 months ago
Very interesting and thoughtful article. Thank you for the comments about smoking. We’re still finding out just how wrong that old CW was. For example, researchers just discovered that a key bacteria in gum disease alters its DNA and cell structure in response to cigarette smoke, making it more virulent and resistant to the body’s normal defenses. We write extensively about related issues at http://dentistryfordiabetics.com/blog, especially the links between elevated blood sugar and gum disease that can interfere with diabetes control and significantly increase serious health risks such as heart attack, stroke and blindness. – Charles Martin, DDS Founder, Dentistry… Read more »
Peggy
Peggy
7 years 4 months ago

I’m smiling to myself as on MSN homepage there was a link to a blurb how coconut is good for you, eat grass-fed beef, the food pyramid might be wrong, etc etc etc… Is the CW startin to swang a little??

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Trinkwasser
Trinkwasser
7 years 3 months ago
In recent weeks there’s been a positive article on low carbing in the Daily Mail, one of the UK’s more reactionary papers, and also in Saga magazine – for the over fifties. Small steps in the most unlikely places. A friend has a useful line “absence of evidence does not mean evidence of absence”. This is one of the major habits of certain “researchers” and of course the likes of journalists. For example diabetics with A1cs in the fives are numerous in real life but not in research papers, in fact I know people who have been turned down for… Read more »
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[…] Everyone – even peddlers of Conventional Wisdom, low-fat proponents like Dean Ornish, and certain vegetarians – agrees that getting enough […]

Kiran
Kiran
7 years 3 months ago

I wonder if smoking is actually not as harmful if you’re on a paleo/low-carb diet, or even simply avoid Omega-6.

I wonder if it’s possible there were no health issues 50 years ago. Maybe cigarettes started causing problems due to diet.

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[…] a shot at getting through to – who could use a little nudge in the right direction, away from CW and toward […]

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7 years 3 months ago
[…] Mark Sisson talks about conventional wisdom… “It seems like common sense to us now that inhaling superheated carcinogenic vapor on a regular basis leads to health issues, but fifty years ago, doctors swore up and down that it wasn’t harmful. They’d light up while taking your temperature and it was common for pregnant women to enjoy a nice smoke. That was the CW regarding smoking (though I wonder what kind of moneyed interests were behind that one) for years. Eventually, the lung cancer-smoking link became undeniable, and scientists now unanimously agree that smoking is bad for your health. It… Read more »
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[…] Everyone – even peddlers of Conventional Wisdom, low-fat proponents like Dean Ornish, and certain vegetarians – agrees that getting enough […]

Larry
Larry
7 years 3 months ago

“the incontrovertible facts of evolutionary biology”..
Really? incontrovertible?
Sounds like misguided CW to me!!!

Joe
Joe
7 years 3 months ago

“the incontrovertible facts of evolutionary biology”..
incontrovertible? Really?
Sounds like misguided CW to me!!!

Dream
7 years 2 months ago

A new favorite post.

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Caveman Carrie
Caveman Carrie
7 years 30 days ago

Can’t wait to watch “Fat Head” tonight.

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[…] for canola oil. Where had I gone wrong? I had to admit, I was indoctrinated into the religion of Conventional Wisdom. I lost my ability to critically think. I was a part of the herd mentality. I knew I had to […]

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[…] where had I gone wrong? I have to admit, I was indoctrinated into the dogma of Conventional Wisdom. I had lost my ability to critically think. I was a part of the herd mentality. I knew I had to […]

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[…] one. The Training Page I am developing will be another. CrossFit generally runs counter to all the Conventional Wisdom available from all the usual suspects, aka the government health agencies and probably your […]

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