No single diet has been shown to extend human lifespan. What the research supports is a set of patterns that keep appearing in populations and trials with better outcomes: mostly plants, adequate protein, high fiber and minimal ultra-processed food.
The entries below cover the specific numbers behind those patterns, and the gut microbiome’s growing but often oversold role in them.
Older muscle responds less efficiently to the same amount of protein, a phenomenon called anabolic resistance. Why targets shift with age, how the longevity and performance literatures pull in different directions, and what the numbers look like as food.
One of the most-studied items in the human diet. What the cohort data shows across mortality, type 2 diabetes, liver disease and Parkinson’s, and why paper-filtering removes the compounds that raise LDL.
Most people eat roughly half the fiber the research supports, and the shortfall shows up across several markers at once. Why it matters this much, where the benefit stops climbing, and which foods close the gap without much effort.
Eating the same meal in a different order measurably changes your glucose response to it. Why sequence affects the curve at all, how much difference it makes against eating everything together, and what it looks like at a real dinner table.
The microbiome is real, important, and heavily oversold by the companies selling tests of it. What it does, the role short-chain fatty acids play, and the honest limits of what commercial testing can currently tell you about yours.
Probiotic effects are strain-specific, while almost all marketing is written at the category level. Why that distinction matters far more than it appears to, and how to read a label critically enough to tell the two apart.
Read the full entry →Eating within a shorter window helps many people, though possibly for simpler reasons than the fasting literature implies. The independent-effect question, which markers it actually targets, and how it compares against a post-meal walk.
One phrase with two meanings: a general idea, and Valter Longo’s specific protocol. The named patterns set side by side, what they all share, and the one place they genuinely contradict each other.
A shorter list than the internet suggests, and the removals matter more than the additions. Nine foods that earn their place, the four worth avoiding, and why “superfood” means nothing.
Protein, carbohydrate and fat targets aren’t arbitrary splits. They’re derived from your calorie target and your goal. How that calculation runs end to end, why protein is handled differently from the other two, and where the ranges come from.
The compounds behind “eat the rainbow” are real, and they have consistently performed better in food than in capsules. Why whole-food sources outperform isolated extracts, and which colours map onto which families of compound.
Two people at the same weight and body fat percentage can carry very different risk, depending on where that fat sits. Why visceral fat behaves so differently from the subcutaneous kind, and how to track it without booking a scan.
Ten minutes of walking after eating blunts the glucose spike from that meal, which is a large return for very little effort. Why walking specifically works, the protocol that has been tested, and which markers it genuinely moves.
The most-studied dietary pattern in longevity research, and one of very few with a large randomised trial behind it. What PREDIMED actually found, the core components of the pattern, and where it overlaps with principles you’ve already read here.
The Blue Zones story is partly well-supported and partly a data-quality controversy that’s still unresolved. This entry marks the line between the dietary patterns themselves and the broader claims made about the regions they came from.
Read the full entry →A structured multi-day protocol designed to trigger fasting responses while you continue to eat. The theory behind it, how it differs from straightforward time-restricted eating, and how early-stage the human evidence honestly still is.
Insulin resistance develops years before fasting glucose begins to rise, which is why it’s so routinely caught late. How it progresses, what fasting insulin benchmarks look like, and why it connects to so much chronic disease downstream.
“Taking fish oil” and “having adequate omega-3 status” are different claims, and only one of them is measurable. What the Omega-3 Index test does differently, where the desirable range sits, and why so few people ever reach it.
No single diet wins. What repeats across populations and trials with better outcomes is a set of patterns rather than a named plan: mostly plants, adequate protein, high fiber, minimal ultra-processed food, and an energy intake that keeps central fat low. Any source claiming a diet extends human lifespan is ahead of the evidence.
One named pattern has the best trial evidence. The Mediterranean pattern is the only widely studied diet with a large randomised trial behind it, which is why it appears more often here than the alternatives. Other patterns overlap with it substantially, and the claims attached to some of those regions are genuinely contested.
Two nutrients get specific numbers. Protein requirements rise with age rather than falling, because aging muscle responds less efficiently to the same dose. Fiber intake in most Western countries sits at roughly half what the research supports. Both are commonly missed, and both are correctable with food rather than capsules.
Composition matters most, but timing is nearly free. What you eat outranks when and in what order. That said, sequencing a meal and walking after it both measurably blunt the glucose rise, at almost no cost, which is visible directly on a continuous glucose monitor.
Most of this shows up as metabolic markers. Fiber, protein, meal timing and body fat distribution all converge on the same downstream numbers: glucose control, HbA1c, lipid particles and insulin sensitivity. That convergence is why metabolic disease is the outcome this category is really about.
The gut is real and oversold at the same time. The microbiome does genuine work, largely through short-chain fatty acids produced when bacteria ferment fiber. What commercial testing can currently tell you about your own is far more limited than the marketing suggests, and eating more fiber is the intervention either way.
It means eating in a way that keeps you healthy for longer, rather than following a named plan. No single diet has been shown to extend human lifespan. What the research supports is a set of patterns that repeatedly appear in populations and trials with better outcomes.
A diet is usually a named set of rules with a start date. A dietary pattern is how someone eats over years. Almost all the longevity evidence is about patterns, because that is what cohort studies can actually measure, and it is why short-term diet results rarely translate.
Because most of the evidence is observational and the effects are small relative to everything else in a life. Short-term trials measure markers rather than outcomes. That combination produces headlines that reverse, while the underlying patterns have stayed remarkably stable for decades.
Yes, and the shortfall is large. Most people eat roughly half the fiber the research supports, and that gap shows up across several markers at once. It is also what gut bacteria ferment into short-chain fatty acids, which is most of the mechanism behind the microbiome’s real effects.
Composition matters most. Timing and meal order matter less, but they are not nothing and they are unusually cheap to apply. Eating the same meal in a different order measurably changes the glucose response, and ten minutes of walking after eating blunts the spike from that meal.
Food and supplements answer different questions. This category covers what you eat and how it is arranged. Isolated compounds sold in capsules are handled separately, largely because whole-food sources have repeatedly outperformed extracted versions of the same compounds.
Substantially. Two people at the same weight and body fat percentage can carry very different risk depending on where that fat sits. Visceral fat around the organs behaves differently from the subcutaneous kind, and a tape measure tracks it well enough that a scan is not required.
Mostly not. The clearest case for supplementing is correcting a measured deficiency rather than adding to an adequate intake. Whole-food sources have also outperformed isolated extracts repeatedly, particularly for the plant compounds that get sold in capsule form.
There is no longevity-specific calorie number, and anyone quoting one is inventing it. What the evidence supports is an intake that keeps central fat low, which is a different target for different people and depends on your size and activity. The calorie restriction research that gets cited here is mostly in animals, and the human trials measure markers rather than lifespan.
Every marker on this page, benchmarked against your own age and sex.
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