Longevity & Aging Newsletter
Issue #3September 22, 20257 studies

Cocoa reduced hsCRP 8.4%/year, while rapamycin improved heart function in older men

This week brought exciting news about interventions that could help us age better, from chocolate-derived compounds that calm chronic inflammation to a drug that rejuvenates aging hearts.

🍫 Cocoa Supplements Cut Age-Related Inflammation

598 older adults (average age 70) took daily cocoa extract supplements containing 500mg of flavanols for 2 years in a randomized controlled trial.

  • High-sensitivity C-reactive protein (a key inflammation marker) dropped 8.4% per year compared to placebo

  • Interferon-γ (an immune signaling protein) increased 6.8% annually versus controls

  • The anti-inflammatory effect may explain why the same trial previously found a 27% reduction in cardiovascular death

Why it matters: Chronic low-grade inflammation (“inflammaging”) drives many age-related diseases. These results suggest that compounds naturally found in cocoa could help dial down the inflammatory processes that accelerate aging.

🥉 Top 5% journal 🔗 Age and ageing 🗓️ Sep 18

Key Findings

💊 Rapamycin Rejuvenates Aging Hearts in Small Trial

  • 6 healthy men aged 70-76 took 1mg rapamycin daily for 8 weeks in an open-label study

  • Heart blood flow, peak flow rate, and blood acceleration all improved significantly

  • Endothelial function (blood vessel flexibility) also enhanced over the treatment period

💡 This pilot study suggests rapamycin may improve cardiovascular function in healthy older adults, though larger controlled trials are needed.
🎖️ Top 10% journal 🔗 GeroScience 🗓️ Sep 19

🧬 DNA Aptamers Spot Senescent Cells More Precisely

  • Researchers used unbiased screening of trillions of random DNA sequences to find molecules that bind specifically to senescent cells

  • The selected aptamers targeted a form of fibronectin protein found on aging mouse cells

  • Aptamer staining increased in naturally aged mouse tissues and decreased when senescent cells were removed

💡 These DNA tools could improve detection and removal of senescent cells, potentially advancing treatments that target cellular aging.
🥉 Top 5% journal 🔗 Aging cell 🗓️ Sep 19

🥗 Restricting One Amino Acid Extends Male Mouse Lifespan

  • Lifelong restriction of the amino acid valine extended male mouse lifespan by 23% but didn't affect female longevity

  • Both sexes showed improved metabolic health, reduced frailty, and better blood sugar control

  • The longevity effect correlated with suppression of PI3K-Akt signaling, a pathway linked to aging

💡 This adds to evidence that specific dietary restrictions may slow aging, though the sex-specific effects highlight the complexity of longevity interventions.

🧠 Brain Aging Motivation Decline Linked to Single Protein

  • Aging mice showed reduced motivation to engage in effortful activities compared to young mice

  • BDNF protein expression specifically decreased in the ventral tegmental area (brain's reward center) during aging

  • Knocking down BDNF in young mice recreated the motivational deficits seen in old mice

💡 Maintaining BDNF levels in specific brain regions may help preserve motivation and prevent age-related neuropsychiatric disorders.
🥈 Top 2% journal 🔗 Molecular psychiatry 🗓️ Sep 15

🔬 Synthetic Senolytic Drug Outperforms Natural Compounds

  • A new synthetic flavonoid (F-4N) showed ~50x greater potency than natural senolytics like fisetin and quercetin

  • In lung fibrosis models, F-4N treatment (10-30 mg/kg daily) reduced senescent cell burden and promoted tissue repair

  • The compound also enhanced markers of lung epithelial healing

💡 Optimized synthetic compounds may be more effective than natural senolytics for treating age-related diseases like pulmonary fibrosis.
Top 20% journal 🔗 ACS pharmacology & translational science 🗓️ Sep 19

🧪 Genetic Factors Shape Fasting's Anti-Aging Benefits

  • 800 mice from 10 different genetic backgrounds underwent intermittent fasting (2 days per week)

  • Fasting effects on lifespan varied dramatically by genetic background and sex

  • Some strains benefited significantly while others showed minimal or no improvement

💡 Individual genetic makeup may determine who benefits most from intermittent fasting, suggesting personalized approaches to longevity interventions.

Implications

These findings paint a picture of aging as a highly individualized process that can be influenced through targeted interventions. From cocoa's anti-inflammatory effects to genetic variations in fasting responses, the research suggests that precision approaches—tailored to individual biology—may be key to successful anti-aging strategies.

Studies in this issue

Primary sources used for this newsletter.

  1. Two-year cocoa extract use and inflammation-related aging markers in older US adults
    main storyAge and ageing2025-09-18PMID 40966617
  2. Cell Culture Selection Finds New DNA Molecules That Specifically Target Aging Cells
    key findingAging cell2025-09-19PMID 40970817
  3. Aging lowers motivation by reducing brain growth factor in the brain’s reward area
    key findingMolecular psychiatry2025-09-15PMID 40954279
  4. How genes control lifespan changes caused by fasting
    key findingbioRxiv : the preprint server for biology2025-09-15PMID 40950084
  5. Long-term low valine diet improves health and lifespan differently in male and female mice
    key findingbioRxiv : the preprint server for biology2025-09-15PMID 40950235
  6. Designed Flavonol Compounds Help Remove Aging Cells and Heal Lung Scarring
    key findingACS pharmacology & translational science2025-09-19PMID 40969882
  7. Short-term rapamycin treatment may improve heart and blood vessel function in older men
    key findingGeroScience2025-09-19PMID 40971115

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