• concept
Aging
The biology of aging. Two things here are well supported: cellular NAD+ (an energy and repair molecule) declines with age, and treating aging as a modifiable process — targeting the shared drivers of age-related disease rather than one disease at a time — is a serious mainstream research program, not just hype. What remains unproven is whether any currently available intervention actually extends healthy human lifespan.
14 well-supported · 3 disputed. This shows how settled each sub-question is, not whether Aging is "good." Direction lives in each claim below.
The 18 claims about Aging
Each keeps its own verdict — we never average them away.
Does being in ketosis help the brain clear the sticky misfolded proteins seen in Alzheimer's?
Leans support 🐭 Non-human evidence In aged and Alzheimer's-model mice and cells, the ketone BHB shifts misfolded proteins toward an insoluble, clearable state and boosts autophagy, but this is animal/mechanism evidence only, not shown to help people.
Is ageing a treatable disease?
Strong support A viewpoint some researchers argue, not a proven fact — and only tested in cells and animals so far.
Can DNA "clocks" measure how fast you're really ageing?
Strong support Probably modestly yes for predicting age, but it's only a correlation, not proof they track true biological ageing.
Can a blood-metabolite 'vulnerability' score predict death better than your age?
Strong support In its derivation cohort the NMR-based MVX score predicted near-term mortality strongly and added prediction beyond chronological age, with several independent cohorts now replicating it.
If I eat well and have no deficiency, will supplements make me healthier?
Leans support Broadly supported for hard endpoints (mortality, CVD, cancer) where multivitamins and popular longevity supplements show null RCT results — but not absolute: at least one large RCT (COSMOS) found a modest multivitamin benefit on cognition.
Does NAD+, a key cellular energy molecule, fall with age?
Leans support Yes, agreed across many labs, though it's an observed link and the human drop varies by tissue.
Do beans and lentils lower heart disease?
Leans support Probably modestly yes, but it's only an association and there's no clear link to strokes or heart attacks.
Do cells age because they lose their instructions?
Leans support 🐭 Non-human evidence Probably yes, but only shown in animals so far — in people the drift looks correlational, not proven cause.
Is rapamycin proven to make animals live longer also proven to extend human lifespan?
Leans support 🐭 Non-human evidence Robustly extends lifespan/healthspan in mice across independent labs, but in humans only short-term safety and immune-biomarker data exist — no human longevity outcome, exactly as Attia's hedged framing states.
Can a methylation biological-age test guide my personal health decisions or prove an intervention rejuvenated me?
Leans support Reasonably supported — epigenetic clocks predict mortality at the population level but carry year-to-year technical noise (uncorrected versions off by many years), no RCT has shown an intervention durably reverses epigenetic age, and a weight-loss trial found clock changes didn't track cardiometabolic improvement, so individual-level decisions and 'reversal' claims are not evidence-based.
Do "Blue Zones" diets explain why people there live so long?
Leans support Probably modestly yes that the eating pattern tracks longer life, but that the diet causes it is shaky and partly a bad-records artifact.
Do vegetarian, plant-forward diets help you live longer?
Leans support Probably yes — fairly consistent, but it's an association and depends on food quality.
Do sirtuins, the so-called 'longevity' proteins, explain why eating less extends life?
Leans support Unclear — evidence is mixed, only in yeast and worms, and a careful study saw it largely vanish.
Can blocking an enzyme (IDO1) that both amyloid and tau switch on rescue memory in Alzheimer's models?
Leans support 🐭 Non-human evidence One strong mouse/cell study (Science 2024) shows amyloid and tau activate astrocytic IDO1->kynurenine, choking brain glucose use, and that blocking IDO1 restores memory; independent data confirm kynurenine pathway disturbance in human AD but the memory-rescue causal claim rests on this single lab.
Does restoring the gut bacterium Bacteroides ovatus reduce Alzheimer's pathology (shown in mice)?
Contested 🐭 Non-human evidence A single 2025 Cell Metabolism study showed supplementing B. ovatus (or its LPC metabolite) cut amyloid and improved cognition in 5xFAD mice via GPR119/anti-ferroptosis; independent FMT and gut-microbiota work supports a real gut-to-Alzheimer's axis at the genus level, which nudges this to weak support — but no independent group has tested B. ovatus itself against AD endpoints, and one study even found Bacteroides worsening amyloid, so it stays preliminary.
Can today's treatments let people live to 150?
Leans against No, population data and the best models put a hard ceiling near 120–150 as an outer limit.
Does falling NAD+ (a key cell-fuel molecule) disrupt how cells power themselves as we age?
Refuted No — it held in mice, but human trials that raised the molecule showed no benefit.
Does it not matter how many calories you eat, only what kind carbs or insulin?
Refuted The strong claim is refuted: under controlled feeding, calorie quantity drives weight/fat change more reliably than macronutrient composition, though composition does modestly influence appetite and expenditure.
Educational only, not medical advice. Hub descriptions are curated for honesty; see the methodology.