Sir Muir Gray
The Bridge · PreventionPreventionCompressing morbidity at the end of life — by acting on what is actually preventable.
Level 1 · BasicsLongevity BasicsLoss of fitness, physical and mental — reversible, and nothing to do with laziness.
Live Beyond · A Great Mind on the Quest

Sir Muir
Gray

Evidence-based medicine · Live Longer Better
Ageing is not the problem — three other things are · Oxford

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Sir Muir Gray is one of 100+ experts in the Live Beyond Project — a father & son quest for longevity.

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1st
Centre for Evidence-Based Medicine — his
3
Processes that actually cause the damage
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What we can currently do about ageing itself
Knowledge
His elixir of life
Who is Sir Muir Gray

Ageing isn’t the problem. Three other things are.

Sir Muir Gray is the reason British medicine asks for evidence. Building on Archie Cochrane’s work from 1971 — back when, as he puts it, whatever the most senior doctor in the room said was simply the truth — he set up the world’s first Centre for Evidence-Based Medicine in Oxford, recruiting David Sackett to run it in a conversation at Toronto Airport. He then wrote the book on evidence-based healthcare, and extended the idea into public health.

He is careful that this was never cookbook medicine. A decision has to combine three things: the evidence from studying groups of people, the condition of this individual, and the values of that individual or population. That last element is where his thinking has moved since — beyond evidence-based toward value-based care, on the grounds that something being in the evidence base does not make it valuable to the person in front of you.

And then there is his position on ageing, which sits at an angle to almost everything else in this project. Ageing, he argues, is not a cause of major problems for the majority of people. The evidence points instead at three processes: loss of fitness, physical and mental; disease, much of it preventable and made worse by the accelerated loss of fitness that follows diagnosis; and social factors — deprivation, isolation, and ageism, which affects everyone.

The crucial part is that we can currently do nothing about ageing itself, but loss of fitness is reversible — and it is not caused by laziness. It is caused by the environment. Following Daniel Lieberman, he describes mismatch conditions: bodies selected over hundreds of generations to move constantly and store fat rapidly, now sitting still surrounded by calories. He is, entirely seriously, trying to get sitting classified as an occupational hazard, like radiation.

His example of ageism is the one that stays with you. A son sees his mother struggling to walk to the shops and arranges for the food to be delivered — rather than helping her walk better. The help accelerates the decline. Understanding all four factors, he argues, is how a society compresses morbidity at the end of life, and it is what the Live Longer Better programme exists to teach. Knowledge, he says, is the elixir of life.

Evidence-based medicine Value-based healthcare Live Longer Better Compression of morbidity
Portrait of Sir Muir Gray in the library in Oxford during the Live Beyond interview
Oxford · July 2024

A library in Oxford

Where we met

We filmed with Sir Muir in a book-lined room in Oxford, two armchairs facing each other, planes passing overhead often enough that we had to stop and restart — a familiar problem by then, after San Diego. Leslie Kenny had introduced him to us as the man who brought precision medicine to the UK. He corrected that in his second sentence: not precision medicine, evidence-based medicine. The rest of the conversation had that quality throughout.

Oxford
July 2024
A library, two armchairs, and a very precise Scottish accent.
The first centre
Evidence-based medicine
Founded here — and Dave Sackett recruited in Toronto Airport.
Live Longer Better
The programme
Teaching the four factors, so morbidity gets compressed rather than extended.

“Ageing is not a cause of major problems for the majority of people. The evidence is that there are three other processes taking place.”

— Sir Muir Gray, Oxford
In his words

Knowledge is the elixir of life

“We can do nothing about the ageing process. But we can reverse loss of fitness — which is not due to laziness or lifestyle. It’s due to the environment we live in.”

Sir Muir Gray · Oxford

Evidence-based medicine is not cookbook medicine. It takes the evidence from groups, the condition of this individual, and the values of this individual.

Sir Muir Gray

The fact that something is in the evidence base does not mean it is of high value to the individual, or to the population.

Sir Muir Gray

I’m trying to get sitting classified as an occupational hazard, like radiation.

Sir Muir Gray

It was the plague, then cholera, then tuberculosis, then cancer. Now it is dementia and dependency. That is what people fear most.

Sir Muir Gray
In his own words

Straight from the interview

From our conversation in Oxford — the four factors, why help can make things worse, and what he believes people are actually afraid of.

The four factors

Ageing, loss of fitness, disease and social factors. Only the first is currently untouchable. The other three are where the damage actually comes from — and all three can be acted on today, without waiting for any laboratory.

“Aging, loss of fitness, disease, and social factors — we can compress morbidity at the end of life.”

Oxford · from the interview

Why help can accelerate decline

His sharpest observation, and the one most people get wrong. Once someone is ill, others do more for them — and the loss of fitness speeds up. Kindness, applied without thought, becomes a form of ageism.

“A son who sees his mother struggling to the shops will arrange for food to be delivered, instead of helping her walk better.”

Oxford · from the interview

What people actually fear

He has always been interested in what a society is afraid of, and he traces the sequence: plague, cholera, tuberculosis, then cancer once tuberculosis was beaten. The current fear is different in kind — it is about losing yourself, not losing your life.

“Now it is dementia and dependency, and needing social care.”

Oxford · from the interview
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From the conversation

Sir Muir Gray, in his words

Video interview

The video interview is coming. Recorded interviews go live after the launch of the film & series Live Beyond.

Selected passages from our conversation with Sir Muir Gray — Oxford, July 2024. Lightly edited for readability.

On what he actually brought to the UK

Marek Piotrowski“Leslie told me you were one of the first to introduce functional medicine, or precision medicine, to the UK.”

Sir Muir Gray“Not precision medicine — evidence-based medicine. When I started, if you wanted to know whether a drug was effective, then whatever the most senior doctor in the room said was the truth. And then in 1971 a man called Archie Cochrane, a Scottish man like me…”

On building the first centre

Sir Muir Gray“We set up here the world’s first Centre for Evidence-Based Medicine, and recruited Dave Sackett in Toronto Airport. Evidence-based medicine is not cookbook medicine, as we were accused, because it has to take into account the evidence from the study of groups of people, the condition of this individual, and the values of this individual or this population. Then I developed evidence-based healthcare and evidence-based public health.”

On moving beyond evidence to value

Sir Muir Gray“Now the word evidence-based is used everywhere. These have been paradigm shifts in decision-making, and we’re now moving beyond evidence-based to talk about value-based. The fact that something is in the evidence base does not mean it’s of high value to the individual or the population. Most of that shift happened within a couple of miles from here.”

On the three processes that are not ageing

Sir Muir Gray“Ageing is not a cause of major problems for the majority of people. The evidence is that there are three other processes taking place. One is loss of fitness, physical and mental. The second is disease, much of it preventable, complicated by accelerated loss of fitness. And the third are social factors — too many people are affected by deprivation and isolation, and everyone’s affected by ageism.”

On why loss of fitness is not laziness

Sir Muir Gray“At the moment we can do nothing about the ageing process. But we can reverse loss of fitness, which is not due to laziness or lifestyle — it’s due to the environment in which we live. This is Daniel Lieberman from Harvard: we evolved over hundreds of generations to select genes that favour running about all the time, and putting on fat very quickly if you find food. Those were advantages. But for the last two generations we’re not running about — we’re sitting all the time. I’m trying to get sitting classified as an occupational hazard, like radiation. And everywhere you look, there are calories. These are what Lieberman calls mismatch conditions.”

On the help that harms

Sir Muir Gray“When you get disease, other people want to do more things for you — so the loss of fitness that takes place is accelerated after the onset of disease. A son who sees his mother struggling to the shops will immediately arrange for food to be delivered, instead of helping her walk better to the shops. And that, again, is part of ageism.”

On what people are most afraid of

Sir Muir Gray“I’ve always been interested in fears. It was the plague for hundreds of years, then cholera in the nineteenth century, then tuberculosis — The Magic Mountain, for example. All of those were overcome, and after tuberculosis, cancer became the number one fear. But I think now it is dementia and dependency, and needing social care. That is the new fear dominating society.”

His wish for the quest

Sir Muir Gray“You’re doing exactly the right thing. The elixir of life is knowledge, and it’s consumed by learning — we’ve got a learning programme we’ve developed here in Oxford. I think your mission is at least as important as anything going on in any lab anywhere in the world.”

More passages from the full interview will be published here.

Continue the quest

More minds on the quest

Sir Muir sits on the Bridge of Prevention and in Longevity Basics — the two levels where, on his reading of the evidence, almost all the winnable ground actually is.

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