13215d7ddb
Issue #46 (Phase A only — Phase B human rating still pending, issue stays open). Adds the data-collection half of the calibration milestone: - scripts/calibration_runner.sh — runs 20 fixed balanced-depth queries across 4 categories (factual, comparative, contradiction-prone, scope-edge), 5 each, capturing per-run logs to docs/stress-tests/M3.3-runs/. - scripts/calibration_collect.py — loads every persisted ResearchResult under ~/.marchwarden/traces/*.result.json and emits a markdown rating worksheet with one row per run. Recovers question text from each trace's start event and category from the run-log filename. - docs/stress-tests/M3.3-rating-worksheet.md — 22 runs (20 calibration + caffeine smoke + M3.2 multi-axis), with empty actual_rating columns for the human-in-the-loop scoring step. - docs/stress-tests/M3.3-runs/*.log — runtime logs from the calibration runner, kept as provenance. Gitignore updated with an exception carving stress-test logs out of the global *.log ignore. Note: M3.1's 4 runs predate #54 (full result persistence) and so are unrecoverable to the worksheet — only post-#54 runs have a result.json sibling. 22 rateable runs is still within the milestone target of 20–30. Phases B (human rating) and C (analysis + rubric + wiki update) follow in a later session. This issue stays open until both are done. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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330 lines
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Researching: Does intermittent fasting extend lifespan in humans?
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╭─────────────────────────────────── Answer ───────────────────────────────────╮
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│ Current scientific evidence does NOT conclusively demonstrate that │
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│ intermittent fasting (IF) extends lifespan in humans. While IF has proven │
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│ lifespan-extending effects in animal models (particularly rodents), and │
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│ improves multiple healthspan markers in humans—including weight, insulin │
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│ resistance, inflammation, dyslipidemia, hypertension, oxidative stress, and │
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│ autophagy—direct evidence of increased human lifespan from IF is lacking. │
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│ Mechanistically, IF triggers 'adaptive stress' in cells, activating │
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│ antioxidant production, DNA repair, autophagy (via spermidine-mediated │
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│ pathways), and reduced inflammation, all of which are theoretically linked │
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│ to longevity [InsideTracker, FORTH/Nature Cell Biology]. A 2024 review in │
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│ Ageing Research Reviews concluded IF 'can be considered a │
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│ non-pharmacological strategy to extend lifespan' and has been 'proven to │
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│ extend lifespan in rodent models,' but human translation remains unconfirmed │
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│ [ScienceDirect/PubMed]. A scoping review of RCTs found IF improves │
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│ aging-related biomarkers in adults but stopped short of claiming lifespan │
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│ extension [PMC]. A 2024 Nature study on genetically diverse mice showed │
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│ dietary restriction (including IF) extends healthy lifespan in mice but its │
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│ human relevance is unclear. Critically, a major 2024 AHA-presented │
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│ observational study of 20,000+ U.S. adults found that eating within an │
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│ 8-hour window was associated with a 91% higher risk of cardiovascular death │
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│ compared to eating across 12–16 hours—though this study has been heavily │
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│ criticized for methodological limitations including confounding variables │
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│ (demographics, pre-existing disease) and reliance on only two days of │
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│ dietary recall data [AHA, WebMD, Forbes]. In summary, IF improves several │
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│ biomarkers associated with healthy aging in humans, and extends lifespan in │
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│ animals, but no long-term human RCT has demonstrated actual lifespan │
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│ extension, and some observational data raise cardiovascular safety concerns. │
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╰──────────────────────────────────────────────────────────────────────────────╯
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Citations
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┏━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━┓
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┃ # ┃ Title / Locator ┃ Excerpt ┃ Conf ┃
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┡━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━┩
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│ 1 │ Intermittent fasting and │ IF can be considered as a │ 0.95 │
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│ │ longevity: From animal models │ non-pharmacological strategy │ │
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│ │ to implication for humans - │ to extend lifespan. IF │ │
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│ │ ScienceDirect │ improves physiological │ │
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│ │ https://www.sciencedirect.com │ function, enhances │ │
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│ │ /science/article/abs/pii/S156 │ performance, and slows aging. │ │
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│ │ 8163724000928 │ IF was proven to extend │ │
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│ │ │ lifespan in rodent models. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 2 │ Intermittent fasting and │ Findings to date from both │ 0.95 │
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│ │ longevity: From animal models │ human and animal experiments │ │
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│ │ to implication for humans - │ indicate that fasting improves │ │
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│ │ PubMed │ physiological function, │ │
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│ │ https://pubmed.ncbi.nlm.nih.g │ enhances performance, and │ │
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│ │ ov/38499159/ │ slows aging and disease │ │
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│ │ │ processes. Metabolic and │ │
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│ │ │ cellular responses triggered │ │
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│ │ │ by IF could help to achieve │ │
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│ │ │ the aim of preventing disease, │ │
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│ │ │ and maximizing healthspan and │ │
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│ │ │ longevity with minimal side │ │
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│ │ │ effects. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 3 │ How Intermittent Fasting │ In humans, intermittent │ 0.88 │
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│ │ Impacts Longevity: A Summary │ fasting improves weight, │ │
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│ │ of the Research - │ insulin resistance, │ │
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│ │ InsideTracker │ inflammation, dyslipidemia, │ │
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│ │ https://www.insidetracker.com │ and hypertension. IF has also │ │
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│ │ /a/articles/how-intermittent- │ reduced tumor growth, boosted │ │
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│ │ fasting-impacts-longevity │ stem cell production, and │ │
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│ │ │ increased lifespan in mice. │ │
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│ │ │ During fasting, cells undergo │ │
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│ │ │ adaptive stress, which │ │
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│ │ │ activates different pathways │ │
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│ │ │ in the body, resulting in a │ │
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│ │ │ range of effects, including │ │
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│ │ │ increased production of │ │
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│ │ │ antioxidants, DNA repair, │ │
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│ │ │ autophagy. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 4 │ Effects of Intermittent │ In humans, │ 0.97 │
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│ │ Fasting on Health, Aging, and │ intermittent-fasting │ │
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│ │ Disease - NEJM │ interventions ameliorate │ │
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│ │ https://www.nejm.org/doi/full │ obesity, insulin resistance, │ │
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│ │ /10.1056/NEJMra1905136 │ dyslipidemia, hypertension, │ │
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│ │ │ and inflammation. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 5 │ Impact of Intermittent │ Impact of Intermittent Fasting │ 0.90 │
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│ │ Fasting and/or Caloric │ and/or Caloric Restriction on │ │
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│ │ Restriction on Aging-Related │ Aging-Related Outcomes in │ │
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│ │ Outcomes in Adults: A Scoping │ Adults: A Scoping Review of │ │
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│ │ Review of Randomized │ Randomized Controlled Trials. │ │
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│ │ Controlled Trials - PMC │ Nutrients. 2024 Jan │ │
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│ │ https://pmc.ncbi.nlm.nih.gov/ │ 20;16(2):316. doi: │ │
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│ │ articles/PMC10820472/ │ 10.3390/nu16020316 │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 6 │ International scientific │ intermittent fasting increases │ 0.90 │
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│ │ collaboration reveals how │ the levels of spermidine, a │ │
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│ │ intermittent fasting │ chemical compound (natural │ │
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│ │ regulates ageing through │ polyamine), that enhances the │ │
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│ │ autophagy | FORTH │ resilience and survival of │ │
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│ │ https://forth.gr/en/news/show │ cells and organisms, through │ │
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│ │ /&tid=2606 │ the activation of autophagy. │ │
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│ │ │ Autophagy defects have been │ │
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│ │ │ linked to ageing, as well as, │ │
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│ │ │ with the emergence of │ │
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│ │ │ age-related disorders. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 7 │ Dietary restriction impacts │ Caloric restriction extends │ 0.92 │
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│ │ health and lifespan of │ healthy lifespan in multiple │ │
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│ │ genetically diverse mice | │ species. Intermittent fasting, │ │
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│ │ Nature │ an alternative form of dietary │ │
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│ │ https://www.nature.com/articl │ restriction, is potentially │ │
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│ │ es/s41586-024-08026-3 │ more sustainable in humans, │ │
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│ │ │ but its effectiveness remains │ │
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│ │ │ largely unexplored. │ │
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│ │ │ Identifying the most │ │
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│ │ │ efficacious forms of dietary │ │
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│ │ │ restriction is key for │ │
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│ │ │ developing interventions to │ │
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│ │ │ improve human health and │ │
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│ │ │ longevity. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 8 │ Time-restricted eating may │ A popular weight loss strategy │ 0.85 │
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│ │ raise cardiovascular death │ that limits the hours during │ │
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│ │ risk in the long term | │ which calories can be consumed │ │
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│ │ American Heart Association │ may nearly double a person's │ │
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│ │ https://www.heart.org/en/news │ long-term risk of dying from │ │
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│ │ /2024/03/18/time-restricted-e │ cardiovascular disease, new │ │
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│ │ ating-may-raise-cardiovascula │ research finds, especially │ │
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│ │ r-death-risk-in-the-long-term │ among people with underlying │ │
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│ │ │ cardiovascular disease or │ │
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│ │ │ cancer. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 9 │ Fasting Study Under Fire │ Those conclusions are │ 0.87 │
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│ │ After Heart Conference - │ premature and misleading, says │ │
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│ │ WebMD │ Christopher Gardner, PhD, a │ │
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│ │ https://www.webmd.com/heart-d │ professor of medicine at │ │
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│ │ isease/features/is-intermitte │ Stanford University... people │ │
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│ │ nt-fasting-bad-for-heart-heal │ in the study group who │ │
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│ │ th │ consumed all their food in a │ │
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│ │ │ daily window of 8 hours or │ │
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│ │ │ fewer had a higher percentage │ │
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│ │ │ of men, African Americans, and │ │
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│ │ │ smoke. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 10 │ Intermittent Fasting - The │ intermittent fasting activated │ 0.78 │
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│ │ Impact on Autophagy, │ autophagy, a cellular process │ │
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│ │ Inflammasome, and Senescence │ that breaks down components │ │
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│ │ https://nomix.ai/2024/05/24/f │ within cells. Autophagy has │ │
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│ │ asting-in-young-males-examini │ been linked to longevity... │ │
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│ │ ng-the-impact-on-autophagy-in │ p21 levels decreased during │ │
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│ │ flammasome-and-senescence-bio │ and after fasting. The │ │
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│ │ markers/ │ findings suggest that fasting │ │
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│ │ │ may contribute to delaying the │ │
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│ │ │ onset of age-related diseases. │ │
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├─────┼───────────────────────────────┼────────────────────────────────┼───────┤
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│ 11 │ Effect of fasting-mimicking │ Significant between-group │ 0.82 │
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│ │ diet on markers of autophagy │ differences were observed in │ │
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│ │ and metabolic health in human │ changes from baseline to the │ │
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│ │ subjects | GeroScience │ end of the 6-day dietary │ │
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│ │ https://link.springer.com/art │ intervention for body weight, │ │
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│ │ icle/10.1007/s11357-025-02035 │ fasting glucose, BHB, HOMA-IR, │ │
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│ │ -4 │ and autophagic flux (p < │ │
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│ │ │ 0.05)... These results suggest │ │
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│ │ │ that FMD may improve │ │
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│ │ │ autophagic flux and markers of │ │
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│ │ │ metabolic health. │ │
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└─────┴───────────────────────────────┴────────────────────────────────┴───────┘
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Gaps
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┏━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
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┃ Category ┃ Topic ┃ Detail ┃
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┡━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
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│ source_not_found │ Long-term human RCT data │ No randomized controlled │
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│ │ on IF and all-cause │ trial has followed human │
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│ │ mortality or lifespan │ participants long enough │
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│ │ │ to measure actual │
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│ │ │ lifespan extension from │
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│ │ │ IF. All human longevity │
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│ │ │ evidence is based on │
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│ │ │ biomarker surrogates or │
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│ │ │ observational data. │
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├───────────────────────┼──────────────────────────┼───────────────────────────┤
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│ contradictory_sources │ Optimal IF protocol for │ Studies test different │
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│ │ longevity in humans │ protocols (TRF, ADF, 5:2, │
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│ │ │ FMD) with varying │
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│ │ │ durations and │
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│ │ │ populations, making it │
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│ │ │ impossible to identify a │
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│ │ │ single optimal regimen │
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│ │ │ for human longevity. │
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├───────────────────────┼──────────────────────────┼───────────────────────────┤
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│ contradictory_sources │ Cardiovascular safety of │ Short-term studies show │
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│ │ long-term IF │ cardiovascular benefit │
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│ │ │ (improved BP, glucose, │
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│ │ │ cholesterol), but the │
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│ │ │ 2024 AHA observational │
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│ │ │ study suggests possible │
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│ │ │ long-term cardiovascular │
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│ │ │ mortality risk, with │
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│ │ │ experts disputing │
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│ │ │ methodology. │
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├───────────────────────┼──────────────────────────┼───────────────────────────┤
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│ source_not_found │ IF effects across │ Most human studies focus │
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│ │ diverse demographic │ on limited populations │
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│ │ groups │ (e.g., young males, │
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│ │ │ specific ethnic groups), │
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│ │ │ limiting generalizability │
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│ │ │ of longevity findings. │
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└───────────────────────┴──────────────────────────┴───────────────────────────┘
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Discovery Events
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┏━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
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┃ ┃ Suggested ┃ ┃ ┃
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┃ Type ┃ Researcher ┃ Query ┃ Reason ┃
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┡━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
|
||
│ contradiction │ database │ time-restricted │ The AHA 2024 │
|
||
│ │ │ eating │ study claiming │
|
||
│ │ │ cardiovascular │ 91% higher │
|
||
│ │ │ mortality NHANES │ cardiovascular │
|
||
│ │ │ confounding │ death risk │
|
||
│ │ │ variables │ contradicts │
|
||
│ │ │ methodology │ short-term │
|
||
│ │ │ critique 2024 │ studies showing │
|
||
│ │ │ │ CV benefit; │
|
||
│ │ │ │ deeper │
|
||
│ │ │ │ methodological │
|
||
│ │ │ │ analysis is │
|
||
│ │ │ │ warranted. │
|
||
├──────────────────┼───────────────────┼───────────────────┼───────────────────┤
|
||
│ related_research │ arxiv │ spermidine │ The FORTH/Nature │
|
||
│ │ │ autophagy │ Cell Biology │
|
||
│ │ │ intermittent │ finding on │
|
||
│ │ │ fasting lifespan │ spermidine-mediat │
|
||
│ │ │ human clinical │ ed autophagy is a │
|
||
│ │ │ trial 2024 │ novel mechanism │
|
||
│ │ │ │ that may be │
|
||
│ │ │ │ testable in human │
|
||
│ │ │ │ longevity trials. │
|
||
├──────────────────┼───────────────────┼───────────────────┼───────────────────┤
|
||
│ related_research │ database │ fasting mimicking │ A large │
|
||
│ │ │ diet longevity │ registered RCT │
|
||
│ │ │ diet RCT │ (NCT05698654) on │
|
||
│ │ │ NCT05698654 │ fasting-mimicking │
|
||
│ │ │ results │ and longevity │
|
||
│ │ │ │ diet is underway; │
|
||
│ │ │ │ results could be │
|
||
│ │ │ │ transformative │
|
||
│ │ │ │ for the question │
|
||
│ │ │ │ of human lifespan │
|
||
│ │ │ │ extension. │
|
||
├──────────────────┼───────────────────┼───────────────────┼───────────────────┤
|
||
│ related_research │ arxiv │ telomere length │ The Frontiers in │
|
||
│ │ │ intermittent │ Aging study on │
|
||
│ │ │ fasting exercise │ metabolic │
|
||
│ │ │ metabolomics │ signatures of │
|
||
│ │ │ aging biomarkers │ combined exercise │
|
||
│ │ │ 2024 │ and fasting links │
|
||
│ │ │ │ to telomere │
|
||
│ │ │ │ length, a key │
|
||
│ │ │ │ aging biomarker │
|
||
│ │ │ │ worth │
|
||
│ │ │ │ investigating │
|
||
│ │ │ │ further. │
|
||
└──────────────────┴───────────────────┴───────────────────┴───────────────────┘
|
||
Open Questions
|
||
┏━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
|
||
┃ Priority ┃ Question ┃ Context ┃
|
||
┡━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
|
||
│ high │ Will ongoing large-scale RCTs │ No current RCT has followed │
|
||
│ │ (e.g., NCT05698654) provide │ participants long enough to │
|
||
│ │ definitive evidence that IF │ measure actual lifespan; only │
|
||
│ │ extends human lifespan or │ biomarker surrogates have been │
|
||
│ │ healthspan? │ studied. │
|
||
├──────────┼─────────────────────────────────┼─────────────────────────────────┤
|
||
│ high │ Does the cardiovascular │ Experts including Stanford's │
|
||
│ │ mortality risk signal from the │ Christopher Gardner criticized │
|
||
│ │ 2024 AHA observational study │ the study for not controlling │
|
||
│ │ hold up after controlling for │ for demographics, pre-existing │
|
||
│ │ confounders like pre-existing │ disease, and reason for │
|
||
│ │ illness and dietary quality? │ adopting IF. │
|
||
├──────────┼─────────────────────────────────┼─────────────────────────────────┤
|
||
│ medium │ Can spermidine supplementation │ FORTH research showed IF raises │
|
||
│ │ replicate the │ spermidine, which activates │
|
||
│ │ autophagy-activating, │ autophagy and promotes cell │
|
||
│ │ anti-aging effects of IF in │ survival, suggesting │
|
||
│ │ humans who cannot sustain │ supplementation as a potential │
|
||
│ │ fasting? │ proxy. │
|
||
├──────────┼─────────────────────────────────┼─────────────────────────────────┤
|
||
│ medium │ Which IF protocol (TRF, ADF, │ Multiple protocols are studied │
|
||
│ │ 5:2, or FMD) produces the │ with heterogeneous populations, │
|
||
│ │ greatest longevity-associated │ making comparative │
|
||
│ │ biomarker improvements in │ effectiveness unclear. │
|
||
│ │ diverse human populations? │ │
|
||
├──────────┼─────────────────────────────────┼─────────────────────────────────┤
|
||
│ low │ Does the 92-year-old case study │ SAGE Journals reported this as │
|
||
│ │ of repeated 3-week annual │ the world's longest medically │
|
||
│ │ fasting over 45 years offer any │ documented repeated fasting │
|
||
│ │ generalizable insight into │ history; clinical parameters │
|
||
│ │ long-term IF and human │ showed cyclic variation. │
|
||
│ │ longevity? │ │
|
||
└──────────┴─────────────────────────────────┴─────────────────────────────────┘
|
||
╭───────────────────────────────── Confidence ─────────────────────────────────╮
|
||
│ Overall: 0.72 │
|
||
│ Corroborating sources: 9 │
|
||
│ Source authority: high │
|
||
│ Contradiction detected: True │
|
||
│ Query specificity match: 0.85 │
|
||
│ Budget status: spent │
|
||
│ Recency: current │
|
||
╰──────────────────────────────────────────────────────────────────────────────╯
|
||
╭──────────────────────────────────── Cost ────────────────────────────────────╮
|
||
│ Tokens: 62781 │
|
||
│ Iterations: 4 │
|
||
│ Wall time: 105.17s │
|
||
│ Model: claude-sonnet-4-6 │
|
||
╰──────────────────────────────────────────────────────────────────────────────╯
|
||
|
||
trace_id: c4942f00-1b7a-40ba-a6e1-7eaae57b9ee3
|