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LNG — Chapters

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LNG

An evidence-led essay on longevity science

The life
you could live.

An evidence-led interactive essay on longevity science — separating the signal from the noise on diet, exercise, sleep, and the biology of ageing.

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10 chapters · ~14 min read

Why I made this

Piece last updated: 22 May 2026 at 7:51am SAST

My name is Marc Duby, and I try to boil down stories, articles, and topics that I find interesting and worth reading. I know it is hard to find enough time to read articles, books, or even, imagine, scientific papers. That is why I am trying to explain complex topics with these hopefully easy-to-use and interesting little interactive essays.

The starting point

The starting point for this piece was the Oxford Longevity Project report Living Longer, Better: The Age-less Report. I found it fascinating how longevity has become such a huge thing: part science, part industry, part culture war, part personal hope. I wanted to take some of the claims in the report and bring them to life in a way that felt readable, visual, and a little less breathless.

What I was trying to do

I wanted to separate the signal from the noise. Longevity is full of supplements, protocols, miracle routines, and extremely confident men on podcasts. But underneath all that, there are some surprisingly ordinary, evidence-backed ideas: sleep, movement, food, stress, social connection, mindset, and the environments that make healthy choices easier or harder.

Caveats

I am not claiming that everything in these pieces is always 100% accurate. The stories I choose to tell often start from a paper, article, report, or book, and I mention that starting point here. From there, I try to cross-check, simplify, and visualise. Simplifying always loses some detail, and science keeps moving.

This piece is also not medical advice. It is an editorial explainer: a way into the topic, not the final word on it.

Feedback

Any feedback is always welcome: future topics to cover, criticism, corrections, anything. Reach out at mail@pixelpoetry.dev.

Happy reading.

Key takeaways

TL;DR

Chapter 1

The 80% Claim

A landmark report says you are 80% responsible for whether you reach old age in good health. Critics say that framing is dangerous. Both are looking at the same evidence.

The headline number is 80%. The Oxford Longevity Project says that is how much of your health in old age — heart disease, cancer, dementia, the lot — is down to you. Your habits, your environment, your choices. Not your genes. Not your luck.

"It's my life — it's now or never." Jon Bovi knew.

imgur.com/its-is-life-jon-bovi-h7EWAjm

At least 80% of ill health in old age is attributable to modifiable lifestyle and environment — not inherited genetics.

0%
80% Modifiable lifestyle & environment
20% Genetics & chance

In the Guardian coverage of the report, Harvard's professor of social epidemiology called the framing "problematic." A Virginia health-policy director said it risked "taking policymakers off the hook." An Edinburgh public-health professor asked: otherwise what are we saying? That people who have more expensive houses have more discipline?

How much of health is modifiable? What different studies say

Estimated % of chronic disease risk attributable to lifestyle & environment — five independent landmark datasets. The debate is about the exact number, not the direction.

It's good news if you're responsible because then you can do something about it.
Sir Christopher Ball — Oxford Longevity Project

Chapter 2

Three Eras of Medicine

19th-century medicine fought infection. 20th-century medicine fought genetics. 21st-century medicine is fighting choices — and our understanding of what "choices" even means has fundamentally shifted.

In 1850, if you wanted to understand why people died young, you studied sewers. In 1950, you studied chromosomes. In 2025, you study the exposome — the full weight of everything your body has ever been exposed to, from the food you ate as a child to the air you breathed this morning.

The shifting paradigm of medicine

Era of Infection18501940sSewers · Vaccines · AntibioticsEra of Genetics19202000sDNA · Chromosomes · HeredityEra of the Exposome1990nowLifestyle · Epigenetics · Environment18501900195020002025

Genetics account for roughly 25% of variation in lifespan. The other 75% is lifestyle and environment — a finding consistent across the largest twin studies ever conducted.

0%
75% Lifestyle & environment
25% Inherited genetics

Denis Noble's work goes further. His research found that what genes do depends entirely on their environment. A stress hormone doesn't just make you feel anxious — it can silence or activate dozens of genes. "We destroyed a central assumption of gene-centric biology."

The UK Biobank — with nearly 500,000 participants followed for two decades — found the same thing at scale: lifestyle factors predicted the majority of chronic disease risk independent of genetic background.

% of disease risk attributable to lifestyle

Estimated lifestyle-attributable fraction by condition — UK Biobank, WHO GBD 2022, and Islami et al. (CA Cancer J Clin, 2018). After controlling for genetic background.

Chapter 3

The Six Diseases

Heart disease. Cancer. Dementia. "Diabesity." Falls. Autoimmune conditions. These are the six diseases the Oxford Longevity Project names as the drivers of shortened healthspan — and none of them are primarily genetic.

The six diseases are not random bad luck. They are, as Daniel Lieberman calls them, mismatch diseases: conditions caused by putting a Palaeolithic body into an environment it was never built for. The body evolved to sprint from predators and walk ten miles a day. It did not evolve for office chairs, hyperpalatable snacks, and stress that never resolves.

The mismatch is ordinary and modern: bodies adapted for frequent movement now spend much of the day sitting, snacking, and absorbing unresolved stress.

Centre for Ageing Better / Unsplash / unsplash.com/photos/REIecbS8XQY

These six categories now account for more than 80% of all deaths in the UK. Infectious disease — the thing that killed most people in 1900 — barely registers.

Causes of death in the UK (2022)

Share of all registered deaths — WHO Global Burden of Disease / ONS, 2022

"Diabesity" — the co-occurrence of obesity and type 2 diabetes — now affects one in four UK adults in some form, and it is almost entirely driven by diet and physical inactivity. It is the metabolic consequence of the ultra-processed food system.

The twin epidemic: diabetes & obesity in the UK

Diagnosed diabetes cases (millions) and adult obesity prevalence (%) — NHS Digital, ONS Health Survey for England, 1990–2023. Note: axes differ in scale.

Non-communicable diseases now account for 74% of all deaths globally — and in high-income countries the share exceeds 90%. The healthcare systems built to fight infection are now fighting a completely different battle, mostly with the wrong tools.

74 %

of all global deaths are non-communicable disease

Up from ~60% in 2000 — WHO Global Burden of Disease, 2022

Chapter 4

The Fitness Gap

There is a best-possible rate at which the body declines with age — and then there is the rate most of us are actually declining. Sir Muir Gray calls the distance between them the fitness gap. It is enormous, and it is largely reversible.

After the age of 30, physical capacity declines at roughly 0.5% per year if you stay active and engaged. The problem is that most of us are declining at roughly three times that rate — not because of ageing, but because of disuse. We are not old; we are sedentary.

The green line is not a fantasy. It is what the body is capable of when movement is maintained throughout life.

AnaStuart / Wikimedia Commons / CC BY-SA 4.0 (commons.wikimedia.org/wiki/File:Grandpa_Running.jpg)

The gap between what's possible and what's typical widens dramatically after 60. The green line is not fantasy — it is what happens when people maintain daily movement, strength work, and adequate sleep throughout life.

The fitness gap: best possible vs UK average

Physical capacity as % of peak at age 30 — modelled from Muir Gray's fitness-gap research and Lee et al. (Lancet, 2012)

The average UK woman now spends around 19 years of her life in poor health — years that could, in theory, be lived actively.

Falls are the leading cause of injury-related hospitalisation in the over-65s in the UK. Most are preventable — the primary risk factor is not age but inactivity.

Jonuscumgi / Wikimedia Commons / CC BY-SA 4.0 (commons.wikimedia.org/wiki/File:Long_leg_cast.jpg)

Gray quotes the geriatrician Bernard Isaacs: "We should investigate care homes where there were no fractures, because almost certainly the residents were being kept too immobile." What we call the deterioration of old age is often the consequence of immobility — not its cause.

The walking frame — and the frailty it represents — is not an inevitable destination. It is largely the downstream consequence of years of immobility that could have been interrupted.

rawpixel.com / Wikimedia Commons / CC0 1.0 Public Domain (commons.wikimedia.org/wiki/File:A_woman_supporting_herself_with_a_walking_frame.jpg)

Chapter 5

The S-MEDs Framework

The Oxford Longevity Project distils the evidence into five domains where the science is strong enough to act on: Sleep, Mindset, Exercise, Diet, and Stress. Not a lifestyle blog. A framework built from the evidence up.

Sleep comes first. Not because it is the easiest, but because it is the highest-leverage intervention available — it costs nothing, requires no equipment, and its benefits compound across every other domain.

The most underrated longevity intervention costs nothing and requires no equipment. It requires only that you stop treating sleep as negotiable.

Vladislav Muslakov / Unsplash (CC0 1.0 Public Domain, published before 5 June 2017) — commons.wikimedia.org/wiki/File:Woman_lying_face_down_(Unsplash).jpg

Mindset is the most counterintuitive pillar. Becca Levy's research at Yale found that people with positive views of their own ageing live an average of 7.5 years longer than those with negative views — more than the effect of not smoking.

Years added to life expectancy

Measured within the same cohort — Ohio Longitudinal Study of Aging and Retirement. Levy et al., Journal of Personality and Social Psychology, 2002.

Exercise is the single most powerful lever in the framework. Gray's prescription: walk a mile a day, do something that makes you breathe hard twice a week, and do something that challenges your balance and strength once a week. The evidence for each is overwhelming.

Daily movement — not the gym, not performance sport. Walking, breathing hard twice a week, and balance work once a week.

Centre for Ageing Better / Unsplash / unsplash.com/photos/REIecbS8XQY

Diet: plant-forward, minimally processed, protein-sufficient after 50. Every claim in this domain leads back to the same destination. Read the UPF explainer here.

Plant-forward, minimally processed, protein-sufficient after 50. The evidence for each qualifier is consistent across independent research streams.

Unsplash / unsplash.com/photos/IGfIGP5ONV0

Stress: chronic psychological pressure accelerates cellular ageing via cortisol, inflammation, and telomere shortening. Managing it is not a soft skill — it is a clinical one.

The modern environment generates chronic, unresolvable stress — the kind the Palaeolithic body never evolved to handle.

Unsplash / unsplash.com/photos/mVhd5QVlDWw

Chapter 6

Blue Zones

Five places in the world where healthy longevity is unremarkable. Where people routinely reach 90 and 100 in good health. What they share is not a supplement or a secret. It is a way of living.

The five Blue Zones — Sardinia, Okinawa, Nicoya, Loma Linda, Ikaria — were mapped by Dan Buettner and colleagues at National Geographic. In each, the proportion of people reaching 100 in reasonable health is many times the global average.

Okinawa, Japan. Home to one of the highest concentrations of centenarians on earth. The longevity here is not a secret ingredient — it is a way of living: daily movement, social bonds, ikigai, and a plant-forward diet.

Blue Zones / bluezones.com

Okinawa leads the data — historically producing roughly six times as many centenarians per 100,000 people as the UK or US average.

Centenarians per 100,000 people

Approximate rates from Blue Zone research — Buettner & Skemp (AJLM, 2016). Note: record-keeping quality varies by region.

What the Blue Zones share is not a single food or habit. It is a set of overlapping patterns: plant-forward diets, daily moderate movement built into the environment, dense social networks, a clear sense of purpose, and low chronic stress.

Where the centenarians live

Loading map…

Bubble values show approximate centenarians per 100,000 people in the five Blue Zones.

The honest caveat: some Blue Zone longevity data has been challenged by researchers who found patterns consistent with record-keeping errors. The specific centenarian counts may be inflated. But the lifestyle patterns — and their health associations — hold up across dozens of independent research streams.

The exact Blue Zone counts may contain errors, but the lifestyle pattern remains well supported: everyday movement, mostly whole foods, social connection, purpose, and low chronic stress.

Unsplash. Photo used to illustrate lifestyle patterns.

Chapter 7

What the Critics Get Right

The OLP report frames its evidence at the level of the individual. The same evidence supports a very different reading. Both are correct — and that is the whole problem.

In England, the gap in healthy life expectancy between the most deprived and least deprived areas is 18.5 years. That is not explained by individual choices. The Guardian critics named the wider causes clearly: work, poverty, pollution, corporate freedom to sell unhealthy products, and unequal healthcare access.

Aylesbury Estate, Southwark, London — one of the most deprived housing estates in England.

John "Jack" Welsh, CC BY 3.0 via Wikimedia Commons

The data is unambiguous. Where you are born in England predicts how long you will stay healthy — by almost two decades. What are these categories?

Healthy life expectancy at birth by deprivation (England), in years

Years of healthy life expectancy by deprivation decile — Public Health England, 2017. D1 = most deprived.

The synthesis is not comfortable: both sides are right. The OLP report is correct that most of the biology of ageing is modifiable. The critics are correct that modifying it is not equally available to everyone. The honest policy answer is to do both: invest in individual health behaviour and redesign the environments that constrain it.

The report problematically avoids engaging with the societal determination of health and health inequities.
Prof Nancy Krieger — Harvard T.H. Chan School of Public Health

Chapter 8

The Women's Health Gap

Women live longer than men but spend more of those extra years in poor health. They are the majority of the over-65s and roughly 80% of centenarians. And they are the demographic most consistently underserved by the healthcare system.

A UK man can expect to live to 79 and be in good health until 63 — roughly 16 years of poor health at the end. A UK woman lives to 83 but is healthy only until 64 — almost 19 years in poor health. Women live longer and suffer more.

Life vs healthy life expectancy at birth

UK, 2018–2020 — ONS Health State Life Expectancies bulletin

Women are not fragile — they are biologically robust. They make up roughly 80% of all centenarians globally. The problem is not female biology; it is how the healthcare system treats female biology, particularly across the hormonal life course.

Women are the demographic most likely to reach 100 — and the most consistently underserved by a healthcare system designed around male physiology.

Bill Branson / National Cancer Institute (visualsonline.cancer.gov, image ID 2376) — Public Domain

In 2002, the Women's Health Initiative published findings widely interpreted as showing that hormone replacement therapy caused cancer and heart disease. The interpretation was almost entirely wrong — but the wave of prescription cancellations it triggered persisted for a decade.

Chapter 9

The Economics of Longevity

Prevention is not just better than cure — it is extraordinarily cheaper. The economic value of slowing ageing by a single year across the US population has been estimated at $37 trillion. We are spending the equivalent of that on the consequences of not doing it.

Economists Scott and Ellison calculated that slowing biological ageing to add one year of healthy life expectancy across the US population would generate approximately $37 trillion in total economic value. That is not an annual budget or a literal pot of money — it is an estimate of the value of healthier, longer lives. To make the scale legible: it is enough to spend $1 million every single minute for more than 70 years.

In England, the NHS is now spending more money per person than at any point in its history — and healthy life expectancy has been flat for almost two decades. The OLP calls it a "national sickness service": brilliantly designed to treat acute illness, structurally unable to prevent the chronic conditions that are overwhelming it.

Composite image: the longevity gap is both structural and personal — shaped by systems, work, neighbourhoods, and the everyday opportunities people have to stay fit.

Composite by Marc Duby. Source images: Unsplash / Nonsap Visuals and Unsplash / Getty Images.

The lines tell the story. NHS spending has more than doubled in real terms since 2005. Healthy life expectancy at birth has barely moved. This is not a failure of medicine — it is a failure of incentives.

NHS spending vs healthy life expectancy in England

Real-terms NHS England spending (£bn) and healthy life expectancy at birth (years) — NHS England annual reports and ONS HLE bulletins, 2005–2022

The policy case writes itself: tax sugar like tobacco. Tax alcohol like tobacco — Canada's 2023 guidelines concluded there is no safe level of alcohol consumption. Make healthy choices the easy choices. The alternative — treating preventable disease — is costing more every year and delivering less.

Prevention ROI: £ returned per £1 invested

Estimated benefit-cost ratios for prevention programmes vs acute treatment — NICE, Public Health England, and Briggs et al. analyses.

Chapter 10

What Do You Do on Monday?

Sir Christopher Ball is 91 years old. He wrote the chapter in the OLP report about what he actually does. Here is what the evidence says — separated from what it does not say.

Ball's daily routine: a cold-to-warm shower, a barefoot walk in his garden, a vegan breakfast in bed, and three miles every other day with friends. No food after 2pm except a small supper. This is eccentric. It is also extremely well-documented — and almost every element has a corresponding research citation.

Healthy habits are usually ordinary: movement, hydration, consistency, and the tools close enough to use.

Dua Gianna / Unsplash (unsplash.com/photos/2-black-and-gray-dumbbells-on-green-grass-IzdLRdXcNT8)

Here is what the evidence actually supports — ordered by strength of evidence. The top items have the most consistent meta-analytic support. The bottom item should be treated with deep scepticism.

Longevity interventions: evidence strength

Relative evidence strength index — derived from meta-analyses in Li et al. (PNAS 2021), Lee et al. (Lancet 2012), and Cappuccio et al. (Sleep 2010). Not a direct comparison of effect sizes.

Most of the supplement industry, most of the longevity influencer economy, and most of the anti-ageing product market operates in the bottom half of that chart. The things with the strongest evidence — exercise, sleep, not smoking, social connection — are free, or nearly so. They require sustained, ordinary effort over a long period of time.

Yoga, movement, staying active. It does not have to be expensive.

riseyoga.co.za — Photo by Marc Duby

The decisions you make in the next five years will shape the next fifty.
Sir Christopher Ball — Oxford Longevity Project

Key takeaways

TL;DR

  • In 2025, you study the exposome — the full weight of everything your body has ever been exposed to.

  • Sleep, Mindset, Exercise, Diet, and Stress. Not a lifestyle blog. A framework built from the evidence up.

  • The OLP report frames its evidence at the level of the individual. The same evidence supports a very different reading.

  • Here is what the evidence actually supports — ordered by strength of evidence.

  • The things with the strongest evidence are free, or nearly so.

The science is clearer than the culture admits. You have more control than you have been told — and less than the report implies. The honest answer is somewhere in the middle, and it starts on Monday.

Sources
& methodology

Every statistic shown in this essay is drawn from a peer-reviewed paper, an international research review, or the published account of an independent investigation. The full citation list is to the right.

Citations

  1. OLP report Ball, C., Gray, M., Ch'en, P., Kenny, L. & Noble, D. (2026). Living Longer, Better: The Age-less Report. Oxford Longevity Project. Read source ↗
  2. Guardian / Hill (2026) Hill, A. (2026, May 20). "At least 80% responsibility for ill health in old age down to individual, study says." The Guardian. Read source ↗
  3. Unsplash lifestyle-pattern photo Unsplash. "Woman in yellow and white floral button-up shirt holding yellow banana." Read source ↗
  4. Rise Yoga / Marc Duby Rise Yoga. Yoga, movement, and staying active. Photograph by Marc Duby. Read source ↗
  5. Balance composite image Composite image by Marc Duby using source images from Unsplash. The image contrasts systemic constraints with personal decisions and everyday opportunities to stay active.
  6. Noble (2023) Noble, D. (2023). Understanding Living Systems. Cambridge University Press. Read source ↗
  7. Buettner & National Geographic (2023) Buettner, D. & Skemp, S. (2016). Blue Zones: Lessons From the World's Longest Lived. American Journal of Lifestyle Medicine, 10(5), 318–321. Updated reporting: National Geographic, 2023. Read source ↗
  8. Yarmolinsky et al. / UK Biobank (2022) Yarmolinsky, J. et al. (2022). Association of modifiable risk factors in young adulthood with future risk of common diseases: multivariate Mendelian randomisation study using UK Biobank. The BMJ, 379, e071225. Read source ↗
  9. ONS Healthy Life Expectancy (2022) Office for National Statistics (2022). Health state life expectancies, UK: 2018 to 2020. Statistical Bulletin. Read source ↗
  10. WHO Global Burden of Disease (2022) World Health Organization / Institute for Health Metrics and Evaluation (2022). Global Burden of Disease Study 2022. Read source ↗
  11. Scott & Ellison (2021) Scott, A. J. & Ellison, M. (2021). The Economic Value of Targeting Ageing. Nature Aging, 1, 616–623. Read source ↗
  12. Dua Gianna / Unsplash Dua Gianna. "2 black and gray dumbbells on green grass." Unsplash. Published August 13, 2021. Read source ↗
  13. Li et al. / PNAS (2021) Li, Y. et al. (2021). Healthy lifestyle and life expectancy free of cancer, cardiovascular disease, and type 2 diabetes: prospective cohort study. PNAS. Read source ↗
  14. Centre for Ageing Better / Unsplash Centre for Ageing Better. Older adults exercising together outdoors. Unsplash. Read source ↗
  15. Muir Gray (BMJ, 2019) Gray, M. (2019). The Fitness Gap: How inactivity ages us faster than time. BMJ editorial and supporting evidence. Read source ↗
  16. Walker (2017) Walker, M. (2017). Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner. Read source ↗
  17. Lieberman (2013) Lieberman, D. (2013). The Story of the Human Body: Evolution, Health, and Disease. Pantheon Books. Read source ↗
  18. Levy et al. / JPERS (2002) Levy, B. R., Slade, M. D., Kunkel, S. R., & Kasl, S. V. (2002). Longevity increased by positive self-perceptions of aging. Journal of Personality and Social Psychology, 83(2), 261–270. Read source ↗
  19. Herskind et al. (1996) Herskind, A. M. et al. (1996). The heritability of human longevity: a population-based study of 2872 Danish twin pairs born 1870–1900. Human Genetics, 97(3), 319–323. Read source ↗

Image credits

  • Jon Bon Jovi mid-performance, arms wide, living his best life on stage. imgur.com/its-is-life-jon-bovi-h7EWAjm
  • An older woman doing exercises at an outdoor fitness class on a running track, surrounded by other participants. Centre for Ageing Better / Unsplash / unsplash.com/photos/REIecbS8XQY
  • An older man running outdoors, relaxed and in full stride. AnaStuart / Wikimedia Commons / CC BY-SA 4.0 (commons.wikimedia.org/wiki/File:Grandpa_Running.jpg)
  • A full-length white plaster cast on a leg, the result of a tibial fracture. Jonuscumgi / Wikimedia Commons / CC BY-SA 4.0 (commons.wikimedia.org/wiki/File:Long_leg_cast.jpg)
  • An older woman steadying herself with a metal walking frame. rawpixel.com / Wikimedia Commons / CC0 1.0 Public Domain (commons.wikimedia.org/wiki/File:A_woman_supporting_herself_with_a_walking_frame.jpg)
  • A person lying face-down on white sheets, in deep, peaceful rest. Vladislav Muslakov / Unsplash (CC0 1.0 Public Domain, published before 5 June 2017) — commons.wikimedia.org/wiki/File:Woman_lying_face_down_(Unsplash).jpg
  • Colourful bowls of vegetable salads and whole foods arranged on a table. Unsplash / unsplash.com/photos/IGfIGP5ONV0
  • People rushing up and down escalators in a busy shopping mall — a symbol of the relentless pace of modern life. Unsplash / unsplash.com/photos/mVhd5QVlDWw
  • A traditional Okinawan street scene — low rooftops, lush greenery, and a quiet pace of daily life. Blue Zones / bluezones.com
  • A woman in a yellow and white floral shirt holding a banana. Unsplash. Photo used to illustrate lifestyle patterns.
  • Aylesbury Estate council housing blocks in Southwark, London — a brutalist concrete tower block under grey skies John "Jack" Welsh, CC BY 3.0 via Wikimedia Commons
  • Three older women stretching and exercising outdoors at exercise stations in a park. Bill Branson / National Cancer Institute (visualsonline.cancer.gov, image ID 2376) — Public Domain
  • Composite image contrasting everyday opportunities to stay active with work and infrastructure environments. Composite by Marc Duby. Source images: Unsplash / Nonsap Visuals and Unsplash / Getty Images.
  • Two black and grey dumbbells on green grass beside a water bottle. Dua Gianna / Unsplash (unsplash.com/photos/2-black-and-gray-dumbbells-on-green-grass-IzdLRdXcNT8)
  • People practising yoga outdoors by the sea at sunrise. riseyoga.co.za — Photo by Marc Duby

All images are used for editorial and educational commentary only. If you are the rights holder of any image and wish it to be removed or re-credited, please get in touch.

Source