Research Digest
Research Library
Peer-reviewed papers from top journals, summarized and graded by evidence strength. Updated Mon, Wed & Fri.
May 24–30, 2026
3 studiesSelenium Levels and Fatty Liver: Is There a Sweet Spot for Survival?
In nearly 1,800 American adults with fatty liver disease, those with higher blood selenium had a 64% lower risk of dying from any cause compared to the lowest group. But the benefit plateaued once selenium hit about 200 μg/L, so more wasn't better. Older adults and people with high blood pressure seemed to benefit most.
New Trial Will Test Whether Taurine Improves Blood Sugar and Slows Aging
This is a protocol, not results, for a trial giving healthcare workers 3 grams of taurine daily for six months. Researchers want to see if it lowers HbA1c (a long-term blood sugar marker) and improves PhenoAge, a biological age estimate. The study uses a smart adaptive design that can stop early if taurine clearly works or clearly fails.
Vitamin D Deficiency Tied to Higher Diabetes Risk in Older Adults
Among 1,324 adults over 60, about a quarter were vitamin D deficient and over half had either diabetes or prediabetes. Higher vitamin D levels were linked to lower odds of having worse blood sugar status. This is a snapshot study, so it cannot prove vitamin D causes the protective effect.
May 10–16, 2026
2 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.
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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