Bryan Johnson is an American technology entrepreneur who spends roughly two million dollars a year measuring and adjusting his own biology under a programme he calls Blueprint. He reports slowing his rate of biological ageing to about half the normal pace. The routine itself is unremarkable: a fixed bedtime, a plant-based diet, daily exercise and relentless measurement.
Most of what you will read about Johnson is written the week something happens to him. A diagnosis, a blood transfusion, a headline about how he has never shared a bed with his girlfriend. That coverage tells you almost nothing about whether any of it works.
This article does something different. It sets out what the protocol contains, then reads each major component against the randomised evidence for the same intervention, in the same measurement units Johnson himself uses. Some parts hold up better than the coverage suggests. Others rest on a single uncontrolled study. And a few of the most imitated elements have been quietly dropped by Johnson himself.
Who is Bryan Johnson, and how does he pay for this?
Johnson was born on 22 August 1977 in Provo, Utah, and is 49. He founded Braintree, the payments company that owned Venmo, and sold it to PayPal for around 800 million dollars in 2013. He then founded OS Fund, a venture capital firm backing early-stage science, and Kernel, which builds devices that record brain activity.
The money matters to the story, because it sets the ceiling on what anyone can copy. In 2023 Johnson put the annual cost of his regimen at about two million dollars, covering a medical team, imaging, laboratory panels and more than 100 tracked measurements. He has since built a commercial side to it: Blueprint sells supplement and food products, with a Basics subscription launched in 2024 at 333 dollars per month, and the company raised 60 million dollars in October 2024.
So there are two Bryan Johnsons to keep apart. One is an unusually well-funded experiment on a single person. The other is a supplements business with an incentive to make that experiment sound conclusive. Neither is a reason to dismiss the protocol, but both are reasons to check each claim against something other than his own reporting.
What the Blueprint protocol actually involves
Strip away the imaging and the specialists and the daily routine is short enough to describe in a paragraph. Bed at 8.30pm, without exceptions, which Johnson treats as the single non-negotiable rule. About 60 minutes of exercise every morning. All food eaten in the first part of the day, finishing early in the afternoon. A plant-based diet with one declared exception, collagen peptides, the one animal product with randomised trials on skin elasticity and bone density behind it. And a supplement stack that has been cut hard over time: it once ran to 111 pills a day, and by March 2026 it was down to about 30.
That reduction is the most interesting number in the whole protocol, and almost nobody reports it. Johnson removed roughly three quarters of his own supplement stack after measuring what it did. A man with unlimited budget, a full-time medical team and a strong public commitment to supplementation looked at his own data and took most of it away.
A day on the Blueprint protocol
05.00 · Wake and measure
Fixed wake time, followed by body composition, resting heart rate and heart rate variability readings.
05.30 · Exercise
About an hour, mixing resistance work with cardiovascular training, most days of the week.
06.30 · First meal
Plant-based, weighed, with the supplement stack taken alongside rather than scattered through the day.
11.00 · Last meal
Eating finishes early in the afternoon, giving a long overnight fast without a formal fasting protocol.
20.30 · Bed
The fixed element. Johnson describes bedtime as the rule he protects before everything else, including social plans.
Notice what is missing. There is no extreme fasting window, no cold plunge doctrine, no single miracle compound. The scaffolding is sleep timing, food timing and daily movement, which is roughly what any NHS lifestyle advice would tell you, executed with an obsessiveness that no NHS leaflet would ask for.
What does Bryan Johnson eat in a day?
The diet is plant-based, weighed to the gram, and built around a small number of repeated dishes rather than variety. The best known is a green pureed drink he calls “Super Veggie”, built on broccoli, cauliflower, lentils and garlic, eaten alongside a nut and berry pudding. Olive oil is a fixture. Collagen peptides are the one animal product he keeps.
Total intake sits in a moderate calorie deficit relative to what a man of his size would maintain on. That is deliberate, and it is the part of the protocol with the strongest randomised evidence behind it, though not for the reason most people assume. More on that in a moment.
Two practical notes for a British reader. First, the branded Blueprint products are not the protocol: the food pattern is reproducible from a supermarket. Second, a plant-based diet at a calorie deficit makes vitamin B12, iodine, iron and vitamin D worth discussing with a GP or pharmacist rather than guessing at, particularly through a British winter.
How biologically old is Bryan Johnson?
This is the question the search results are full of, and the honest answer is that “biological age” is not one measurement. It is a family of algorithms that read chemical marks on DNA, called methylation, and translate them into a number. Different algorithms give different numbers on the same blood sample, and they were built to answer different questions.
The first generation, published by Steve Horvath in 2013, estimated age from methylation across many human tissues and cell types. It was a landmark, but it estimates a level: how old this tissue looks. The measure Johnson leans on is a later and quite different one. DunedinPACE, published by Daniel Belsky and colleagues in 2022, was trained on the Dunedin birth cohort of 1972 and 1973, tracking within-person decline across 19 indicators of organ-system integrity at four time points spanning two decades. It does not estimate how old you look. It estimates how fast you are currently ageing, in years of biological ageing per calendar year.
A score of 1.0 means you are ageing at one year per year. Johnson has reported a DunedinPACE result of about 0.5, which would mean roughly half a year of biological ageing per calendar year. That is the number behind almost every headline about him.
years of biological ageing per calendar year, the DunedinPACE score Johnson reports. A score of 1.0 is the population norm.
Belsky et al., eLife, 2022, DOI: 10.7554/eLife.73420
Two cautions before you take that at face value. DunedinPACE is a research instrument validated against morbidity, disability and mortality in cohorts, not a diagnostic test for an individual, and it is not available on the NHS. And a single person reporting his own score, on a protocol he sells, is the weakest study design that exists. It is a case report, not evidence.
What the randomised trials say about the same interventions
Here is where the coverage stops and the useful part begins. Several of Johnson’s central interventions have been tested in controlled trials, sometimes using the exact biomarker he quotes. The results are more interesting than either his supporters or his critics tend to allow.
Calorie restriction has been tested, and it moved the same needle. The CALERIE trial randomised 220 participants without obesity to a 25% calorie restriction target or an unrestricted diet for 24 months. In a post hoc analysis published in Nature Aging in 2023, Ryan Waziry and colleagues found that the intervention slowed the pace of ageing as measured by DunedinPACE. It did not significantly change the older clock-style measures, including PhenoAge and GrimAge. The authors are explicit that the effect sizes were small.
That single finding does two things at once. It supports the idea that the pace of ageing is modifiable by diet, which is the intellectual foundation of Blueprint. And it sets a realistic scale: a randomised two-year intervention produced a small shift, not a halving.
Rapamycin has been tested, and it was mostly uneventful. The PEARL trial ran 48 weeks, double-blinded and placebo-controlled, giving healthy adults 5 mg or 10 mg of compounded rapamycin weekly. Published in Aging in 2025, it found adverse events similar across all groups and no significant change in visceral fat. Lean tissue mass and self-reported pain improved in women on the 10 mg dose. The honest reading is that low-dose intermittent rapamycin looked reasonably safe over a year, with efficacy still unestablished.
Thymus regeneration has been tested once, without a control group. The TRIIM study, published by Gregory Fahy and colleagues in Aging Cell in 2019, reported a mean epigenetic age about 1.5 years below baseline after 12 months of treatment, a change of minus 2.5 years compared with no treatment. It is frequently cited as proof that ageing can be reversed. It was small, it was uncontrolled, and it has not been replicated at scale.
| What Johnson does | Best available trial | What it actually measured |
|---|---|---|
| Sustained calorie restriction | CALERIE, 220 participants, 24 months, randomised | A small slowing of DunedinPACE. No significant change on PhenoAge or GrimAge. |
| Weekly low-dose rapamycin | PEARL, 48 weeks, randomised, placebo-controlled | Safety comparable to placebo. Visceral fat unchanged. Lean mass and pain improved in women at 10 mg. |
| Thymus regeneration protocol | TRIIM, one year, no control group | Epigenetic age about 1.5 years below baseline. Uncontrolled, small, not replicated. |
| Fixed bedtime, identical every night | UK Biobank, 60 977 adults, accelerometer-measured | Sleep regularity predicted all-cause mortality more strongly than sleep duration. |
| Daily structured exercise | 122 007 patients, treadmill testing, median 8.4 years follow-up | Elite fitness carried one fifth the adjusted mortality risk of low fitness. |
The headline against the trial
What the coverage says
- Johnson has halved the speed at which he ages.
- His protocol reverses biological age.
- The supplement stack is doing the heavy lifting.
What the evidence shows
- One person, self-reported, on a protocol he sells commercially.
- The only randomised trial on this biomarker produced a small slowing, not a reversal.
- Johnson cut his own stack from 111 pills to about 30 after measuring it.
The plasma exchange, and why he stopped
The experiment that made Johnson notorious ran in 2023: monthly 1 L plasma transfusions, in a three-generation exchange where his teenage son donated plasma to him and he donated to his own father. It generated more coverage than everything else in the protocol combined.
He stopped. Johnson has said he will not repeat the transfusions because he saw no benefit. The United States Food and Drug Administration had already warned that transfusions of this kind, marketed for ageing, are without proven benefit and may be harmful.
This is worth dwelling on, because it is the clearest evidence that Johnson updates on his own data. The most sensational element of the protocol was tested, failed to show a benefit and was dropped. Anyone citing the plasma exchange today as what Bryan Johnson does is describing a discontinued experiment.
The diagnosis that changed the story
In the summer of 2026 Johnson announced that he had been diagnosed with autoimmune gastritis, a chronic and incurable condition in which the immune system attacks the stomach lining. It reduces the stomach’s ability to produce acid and intrinsic factor, which in turn impairs the absorption of iron and vitamin B12. Persistent iron deficiency is often the first clue.
Johnson has rejected the suggestion that his regimen caused it, and there is no evidence that it did. Autoimmune gastritis is not a lifestyle disease. But the diagnosis punctures a specific claim that had been building around him, that sufficient measurement and discipline place a person outside the ordinary risks of being a body. The man who described himself as the most measured human alive still developed a condition his measurements did not prevent.
Two scientists quoted on his work have made the same point in different words. Moshe Szyf, professor of pharmacology at McGill University, has questioned whether the science supports results on the scale Johnson claims. Andrew Steele, a longevity researcher and author, has noted the limit that no amount of protocol reaches: none of these practices changes a person’s genes.
What is worth copying, and what it looks like in the UK
Three parts of Blueprint rest on evidence far stronger than anything supporting the supplement stack, and all three are free. That is the ordinary finding in the research on how long people actually live, not a concession made to readers without two million dollars.
The fixed bedtime. This is the best-supported element of the whole protocol, and the supporting study is British. Windred and colleagues calculated a Sleep Regularity Index from more than ten million hours of accelerometer data in 60 977 participants in UK Biobank. Across the top four quintiles of regularity, compared with the least regular quintile, all-cause mortality was 20% to 48% lower. Regularity predicted mortality more strongly than sleep duration did. Johnson’s one non-negotiable rule turns out to be the one the data most clearly supports.
Cardiorespiratory fitness. Mandsager and colleagues followed 122 007 patients referred for treadmill testing, among whom 13 637 people died across 1.1 million person-years. Adjusted all-cause mortality fell steadily as fitness rose. Elite performers carried a hazard ratio of 0.20 against the least fit, and the penalty for low fitness exceeded that of smoking, diabetes or established coronary artery disease. No supplement in any stack comes close to that effect size.
Adjusted all-cause mortality by fitness, against familiar risk factors
The diet pattern, not the branded products. Plant-heavy, early, moderate in calories, high in olive oil and legumes. CALERIE tested the calorie side of that and moved the biomarker Johnson quotes. You do not need a subscription to reproduce it.
What does not transfer is the measurement infrastructure. In England the routine equivalent is the NHS Health Check, offered by your GP or local council every 5 years between the ages of 40 and 74, covering height, weight, waist, blood pressure and cholesterol in about half an hour. Methylation clocks and pace-of-ageing scores are not part of it, and are sold privately with no NHS validation behind them. The same applies to a direct-to-consumer telomere test, where ten laboratories measuring the same blinded samples ranked them consistently and could not agree on an absolute figure.
The regulatory picture is worth knowing too. Rapamycin is sold in the UK as sirolimus, a prescription-only immunosuppressant. No UK licence covers its use for ageing, so any longevity use is off-label and a decision a prescriber has to justify. Food supplements sit under the Food Standards Agency, and since 1 January 2021 a health claim may only be made on a supplement sold in Great Britain if it appears on the Great Britain Nutrition and Health Claims Register, which replaced the EU register after Brexit. Northern Ireland continues to follow the EU list. If a product promises to reverse ageing, that claim is on neither register.
One more thread from the trial evidence deserves a mention. Much of what the ageing literature now tracks is chronic low-grade inflammation, and it is the thread that connects diet, sleep regularity and fitness to the biomarkers Johnson watches. If that is the lever you want to work on, a well-absorbed natural anti-inflammatory formula is a more sensible starting point than a thirty-pill stack, and it is the same terrain covered by targeted support for ageing joints and cartilage. Neither replaces the three free interventions above, and neither should be started without a word with your GP or pharmacist if you take prescribed medicines.
The fair verdict on Bryan Johnson is not that he is a fraud or a prophet. He is a well-funded experiment with a sample size of one, who happens to have landed on three habits that large studies already supported, and who keeps the receipts in public. That last part is genuinely rare, and it is why the protocol is worth reading even when the headlines are not.
Frequently asked questions
How biologically old is Bryan Johnson?
He reports a DunedinPACE score of about 0.5, meaning roughly half a year of biological ageing per calendar year, against a population norm of 1.0. DunedinPACE measures the speed of ageing rather than an age in years, so it does not translate into “he is X years old”. The score is self-reported and DunedinPACE is a research instrument, not an NHS test.
How is Bryan Johnson reversing his age?
He is not, on the strongest reading of his own data. He reports slowing the pace of ageing, which is a different claim. The only randomised trial to move the same biomarker, CALERIE, achieved a small slowing through 24 months of calorie restriction. Reversal has been reported once, in the small uncontrolled TRIIM study, and has not been replicated at scale.
How many hours of sleep does Bryan Johnson get?
He goes to bed at 8.30pm every night without exceptions and aims for a full night, typically 8 to 9 hours. The consistency matters more than the total. In 60 977 participants in UK Biobank, sleep regularity predicted all-cause mortality more strongly than sleep duration did.
What does Bryan Johnson eat in a day?
A plant-based diet eaten early, finishing in the early afternoon, built around repeated dishes: a pureed vegetable and lentil dish, a nut and berry pudding, olive oil, and collagen peptides as the one animal product. Portions are weighed and total intake sits in a moderate calorie deficit.
How did Bryan Johnson become so rich?
He founded Braintree, the payments company that owned Venmo, and sold it to PayPal for around 800 million dollars in 2013. He later founded OS Fund and Kernel, and now sells Blueprint supplement and food products, which raised 60 million dollars in October 2024.
Can you follow the Blueprint protocol in the UK?
The free parts transfer completely: fixed bedtime, daily exercise, an early plant-heavy eating window. The measurement side does not. Methylation and pace-of-ageing tests are private, not NHS-funded, and rapamycin is a prescription-only immunosuppressant in the UK with no licence for use in ageing. Supplements sold in Great Britain may only carry health claims listed on the Great Britain Nutrition and Health Claims Register.
Is Bryan Johnson’s protocol safe?
The lifestyle core carries the normal risks of any restrictive diet, mainly nutrient gaps on a plant-based deficit, which is a conversation for a GP or pharmacist. The pharmaceutical elements are different. Johnson stopped the plasma transfusions after seeing no benefit, and regulators have warned that such transfusions marketed for ageing are unproven and may be harmful. He also developed autoimmune gastritis, which no amount of measurement prevented.
Sources
- Belsky D.W., Caspi A., Corcoran D.L., et al. DunedinPACE, a DNA methylation biomarker of the pace of aging. eLife, 2022. DOI: 10.7554/eLife.73420
- Waziry R., Ryan C.P., Corcoran D.L., et al. Effect of long-term caloric restriction on DNA methylation measures of biological aging in healthy adults from the CALERIE trial. Nature Aging, 2023. DOI: 10.1038/s43587-022-00357-y
- Horvath S. DNA methylation age of human tissues and cell types. Genome Biology, 2013. DOI: 10.1186/gb-2013-14-10-r115
- Windred D.P., Burns A.C., Lane J.M., et al. Sleep regularity is a stronger predictor of mortality risk than sleep duration: a prospective cohort study. SLEEP, 2023. DOI: 10.1093/sleep/zsad253
- Mandsager K., Harb S., Cremer P., et al. Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testing. JAMA Network Open, 2018. DOI: 10.1001/jamanetworkopen.2018.3605
- Moel M., Harinath G., Lee V., et al. Influence of rapamycin on safety and healthspan metrics after one year: PEARL trial results. Aging, 2025. DOI: 10.18632/aging.206235
- Fahy G.M., Brooke R.T., Watson J.P., et al. Reversal of epigenetic aging and immunosenescent trends in humans. Aging Cell, 2019. DOI: 10.1111/acel.13028
This article is general information, not medical advice. If you are considering a change to your diet, a new supplement or any prescribed medicine, speak to your GP or pharmacist first, particularly if you take medication or have a diagnosed condition.
