11 evidence-first reviews in this topic, built on 44 peer-reviewed citations. Null and negative trials are reported alongside the positive ones — that is the point of the format.
A 2009–2012 CDC survey analysis found periodontitis in 46% of dentate American adults 30 and older. Pooled cohorts of 5.71 million people link it to earlier death, and the count of…
Where the evidence lands: A CDC analysis of 2009–2012 survey data found periodontitis in 46% of dentate US adults 30 and older (8.9% severe). In pooled cohorts of 5.71 million people, periodontitis is associated with all-cause mortality RR 1.46 and edentulism with 1.66; a USPSTF meta-analysis of incident coronary disease in initially CHD-free adults puts the adjusted association at a more modest 1.24 to 1.34. Trials: periodontal treatment transiently worsened, then improved endothelial function (flow-mediated dilation +2.0% at 180 days); CRP averaged 0.50 mg/L lower after therapy, on evidence the reviewers graded modest; the two major glycemia trials split (DPTT, n=514, 6 months, nonsurgical: no HbA1c effect, stopped for futility; a 12-month intensive-treatment trial, n=264: HbA1c 0.6% lower). Tooth count at 70 predicted 7-year mortality (HR 0.96 per tooth) and tooth loss predicted disability and 21-year mortality. All mortality, disability and dementia evidence is observational; the trials in this record tested biomarkers and glycemia, not hard outcomes.
The poster prices loneliness at fifteen cigarettes a day. The abstracts say something more careful and more useful: disconnection carries mortality-grade risk that is “comparable with…
Where the evidence lands: The abstract-supported version of the viral claim: social disconnection's influence on mortality is “comparable with well-established risk factors” (148-study meta, 308,849 people, OR 1.50 for survival with stronger relationships; strongest for complex integration at 1.91, weakest for the living-alone binary at 1.19, not statistically significant) and isolation “predicted mortality… as did smoking and high blood pressure” in NHANES III — but no abstract prices it in cigarettes. The feeling and the fact dissociate: pooled estimates run +29% mortality for isolation, +26% for loneliness, +32% for living alone (and larger in samples averaging under 65), yet in adjusted cohort models the HRS found loneliness itself predicting death (HR 1.45, living situation and depression controlled), while ELSA (isolation 1.26 vs loneliness 0.92) and UK Biobank (1.26 vs 0.99 fully adjusted, with mediators plausibly on the causal pathway) found the fact outlasting the feeling. Cardiovascular slice: +29% coronary disease, +32% stroke. All of it observational — this literature contains no randomized trial testing connection against mortality; among randomized loneliness interventions, those addressing maladaptive social cognition (the lens, not the calendar) worked best.
A Science study followed molecular changes in 335 women. Individual trajectories complicate the idea that one average curve describes how everyone ages.
Where the evidence lands: Repeated measurements can reveal individual variation. They do not by themselves establish a treatment that slows aging.
A Nature Medicine study examines organ-age models separately by sex. Better references may sharpen research, but a clock score is not a rejuvenation prescription.
Where the evidence lands: Sex-specific references can reveal differences in research models. They do not establish an individual aging rate or a treatment that reverses aging.
The national count is a demographic milestone. It does not measure disease-free years or prove a longevity diet.
Where the evidence lands: Population counts describe exceptional survival; they do not establish individual treatment or supplement benefits.
Tea, berries and spices were associated with a changing DNA-methylation clock in a small lifestyle trial. That is a research clue, not an age-reversal menu.
Where the evidence lands: Preliminary human biomarker evidence. Exploratory food associations do not establish individual food effects, whole-body rejuvenation or longer life.
A new cell study explains how pterostilbene may change lipid metabolism. Human trials show why the finding needs careful limits before becoming a supplement or fat-loss claim.
Where the evidence lands: Pterostilbene reduced lipid accumulation in cultured mouse muscle cells. That result does not establish fat loss or improved muscle health from blueberries or supplements in people; human trials add mixed metabolic and null muscle-recovery findings.
A new study connects a membrane protein to AKT signaling, senescence and mouse lung fibrosis. Earlier human-cell experiments show why the direction of intervention still needs careful…
Where the evidence lands: PTCHD4 is a preclinical research lead whose effects differ across experimental contexts. The reported mouse and cell findings do not establish a safe human anti-aging intervention.
An exercise-linked signal produced intriguing results in Alzheimer’s mouse models. Here is what the experiments establish—and what they cannot tell us about treating people.
Where the evidence lands: Irisin is a research lead supported by mechanistic experiments, not a proven dementia treatment or a basis for naming a best leg workout.
The most widely cited number in the caregiving literature, a 63 percent rise in mortality, belonged to strained elderly spouses rather than to caregivers as a group; a propensity-matched…
Where the evidence lands: The famous 63 percent mortality increase (Schulz & Beach, 1999) applied only to elderly spousal caregivers reporting strain — unstrained caregivers showed no elevation (RR 1.08) — and a propensity-matched national analysis of 3,503 caregivers later found an 18 percent LOWER death rate than matched noncaregivers, with no at-risk subgroup even by strain. The reliable toll is psychological (meta-analytic effect sizes ~0.55–0.58 for stress and depression) with a small average physical-health difference (0.18); mechanism studies link chronic psychological stress to slower wound healing in caregivers (48.7 vs 39.3 days for an identical biopsy wound) and to shorter telomeres in high-stress women. Randomized trials back structured support: REACH II's 12-session program cut clinical depression prevalence from 22.7% to 12.6%, and NYU's counseling-plus-support-group program reduced the nursing-home placement rate 28.3%, delaying the model-predicted median time to placement by 557 days, with 61.2 percent of the effect running through the caregiver's own support, coping and mood. Respite care, the most-advocated support, remains an evidence gap (Cochrane: 4 trials, 753 participants, very low quality, no demonstrated effect).
Rentosertib has renewed the debate over biological age. A randomized human experiment offers an important lesson: changing one aging measure does not establish that people live longer.
Where the evidence lands: A clock can predict mortality without being a validated substitute for survival in a treatment trial. CALERIE changed DunedinPACE but did not significantly change PhenoAge or GrimAge.
43 distinct peer-reviewed papers, published 1995–2026, across 38 journals. Each links to its PubMed record; where Magellan has published a full study write-up, that is linked too.
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