Research Digest
Research Library
Peer-reviewed papers from top journals, summarized and graded by evidence strength. Updated Mon, Wed & Fri.
May 10–16, 2026
3 studiesBlood NAD+ Levels Stay Flat With Age, Challenging Popular Aging Theory
One of the most repeated ideas in longevity is that NAD+ declines as we age, a story that helped make NR and NMN household names in the space. This large, carefully controlled study takes a closer look. Across seven independent cohorts and more than 300 people, researchers found that whole-blood NAD+ levels stayed remarkably stable with age, and didn't shift meaningfully in response to exercise, protein-rich diets, or multimodal lifestyle interventions in older adults. Importantly, NR supplementation did raise blood NAD+ as expected, confirming that the supplements work pharmacologically, the question is just whether blood NAD+ is the right thing to be measuring in the first place.
Combining Wearables With Blood Proteins Sharpens Biological Age Tests
Researchers built a new biological age model that combines blood protein data with wearable device readings. It predicted mortality risk better than either tool alone and cut prediction error by 21%. The model also flagged common drugs like GLP-1 agonists and ACE inhibitors as linked to a younger biological age in specific organ systems.
Losing Your Sense Of Smell May Signal Faster Muscle Decline With Age
In adults aged 71 to 82, those who had lost their sense of smell lost grip strength faster over seven years. Men with anosmia also lost more quadriceps strength, though women did not show the same leg muscle effect. The link suggests smell loss may be an early warning sign of neuromuscular aging.
Apr 19–25, 2026
2 studiesInflammation in the Blood Shows Up as Damage in Brain Wiring
In late middle-aged and older adults, higher levels of inflammatory markers in blood were tied to subtle changes in white matter, the brain's wiring. People with more pro-inflammatory cytokines and CRP showed signs of disrupted neural fibers. The link held even after accounting for Alzheimer's biomarkers. This supports the idea that chronic inflammation quietly chips away at brain health.
Healthy Lifestyle Didn't Change Brain Scans, But Still Helped At-Risk Seniors
In older adults at risk for cognitive decline, a two-year program of exercise, better diet, and social engagement didn't visibly change brain biomarkers like amyloid or shrinkage. But people who started with smaller hippocampi (the brain's memory hub) got more cognitive benefit from the structured version. So the lifestyle changes may help thinking even without obviously reshaping the brain.
Apr 12–18, 2026
2 studiesYour Blood Is Both a Mirror and a Driver of How Fast You Age
Scientists are finding that the stuff floating in your blood, proteins, metabolites, and tiny vesicles, doesn't just reflect your age. It actively sets the pace of aging across organs. In animal studies, swapping old blood for young blood or filtering out pro-aging factors restored tissue function and even extended lifespan. Human trials using plasma exchange are now showing early promise for age-related decline.
Tracking Your 'Biological Age' Over Time May Predict Death Risk Better Than a Single Snapshot
In over 90,000 Dutch adults followed for nearly 14 years, people whose biological age ran ahead of their calendar age had a higher risk of dying. More importantly, among 25,000 people measured twice, those whose biological age sped up over time faced even greater risk. People stuck in a pattern of accelerated aging had a 39% higher mortality risk compared to those aging at a normal pace. The results suggest that checking biological age once might not be enough.
Disclaimer: Research summaries are provided for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional before making changes to your health routine.
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