This page introduces the papers selected for the day and their shared context. Open a paper for its question, methods, findings, AI commentary, and evidence limits.
Dietary pattern and epigenetic aging: a longitudinal twin study.
This issue leads with Dietary pattern and epigenetic aging: a longitudinal twin study.. Other sources are selected for design, quantified findings, domain relevance, and venue diversity.
AI commentary: one study is not a licence for deployment, treatment, or training; full text, sample composition, comparators, and failures still require review.
PAPER LEVEL
Papers in this issue · deep dives
This issue is organized around the 2026-09-26 observation window; abstracts and OA full text are not medical, training, nutrition, or regenerative-treatment advice.
This longitudinal twin study examined whether adherence to Danish dietary guidelines is associated with epigenetic age independent of familial confounding. Using monozygotic twins from the Danish GEMINAKAR cohort (established 1997–2000, participants aged 18–67 years) with 12-year follow-up, dietary intake was assessed at both time points by food frequency questionnaires and quantified with the Danish Dietary Index. Epigenetic age was estimated using PCHannum, PCHorvath1, PCPhenoAge, PCGrimAge, and DunedinPACE. Cross-sectional individual-level analyses showed higher adherence associated with lower epigenetic age(ing), particularly PCGrimAge (0.55–0.67 years lower) and DunedinPACE (3.1% lower pace of aging) per 1-unit increase in index score. These associations attenuated in within-twin-pair and longitudinal analyses, suggesting they may be explained by genetic and shared environmental factors. The authors conclude the findings do not support strong independent associations.
This study enrolled 194 pediatric epilepsy patients receiving valproic acid monotherapy to identify metabolomic biomarkers linked to therapeutic efficacy and hepatotoxicity and to build integrated metabolomic-genomic prediction models. Untargeted LC-MS/MS metabolomics revealed differential metabolites associated with response, enriched in pyrimidine, vitamin B6, pantothenate and CoA biosynthesis, and beta-alanine metabolism, and with hepatotoxicity, enriched in arginine biosynthesis, pyrimidine, purine, and steroid hormone biosynthesis. Candidate SNPs from a prior pharmacogenomic study were combined with metabolomic features. Logistic regression models showed good discrimination: for therapeutic response, AUC 0.830 in training and 0.817 in testing; for hepatotoxicity, AUC 0.816 in training and 0.791 in testing. Calibration and confusion matrix analyses supported robustness. The authors conclude that multi-omics integration may improve individualized risk stratification, but prospective multicenter external validation and standardized metabolite assays are required before clinical implementation.
This retrospective study compared routine blood tests, renal function markers, Montreal Cognitive Assessment scores, brain iron deposition, iron metabolism indicators, and neurotrophic factors between hemodialysis patients with chronic kidney disease who had cognitive impairment (observation group AG) and those without cognitive impairment (control group BG). The AG had significantly lower hemoglobin, significantly higher creatinine and uric acid, and a significantly lower estimated glomerular filtration rate. MoCA scores were significantly lower in the AG. Susceptibility values were significantly higher in the substantia nigra, red nucleus, globus pallidus, and caudate nucleus, but significantly lower in the putamen. Ferritin was significantly higher and transferrin significantly lower in the AG. Neuron-specific enolase and nerve growth factor were significantly higher, while brain-derived neurotrophic factor was significantly lower. All reported differences had p < 0.05. The authors conclude that CKD-related cognitive dysfunction reflects synergistic effects across anemia, renal failure, brain iron metabolism disorders, and neuroinflammation-neurotrophic imbalance.
This study tested whether Zophobas morio larvae (ZmL) can serve as a humanized microbiota model for screening decolonization strategies against multidrug-resistant (MDR) bacteria. A pooled fecal transplant from 7 human donors was administered via contaminated food to a group of ZmL every 48 hours for 28 days (T28), followed by a 28-day washout phase. A control group received the standard diet. Gut microbiota composition was assessed at 9 timepoints (T0 to T56) by 16S rRNA gene amplicon sequencing across 3 independent runs. FMTs increased larval gut bacterial richness, with 8 of 10 top human-associated genera increasing during this phase. The experimental group exhibited higher observed richness than the control across T7-T56 (median 116 vs. 62 amplicon sequence variants; p < 0.001). A humanization score, calculated as the sum of the 10 top human genera detected in transplanted ZmL, peaked at T14 and declined to near zero by the end of the washout phase (T56). Community composition differed significantly between groups, with diet accounting for more variation than run (PERMANOVA, R2 = 13.3%; p = 0.001). The authors conclude that under repeated FMTs, ZmL underwent humanization of their microbiota, making this model a promising tool to study novel decolonization strategies against MDR bacteria, and that future efforts should focus on stabilizing the human-like microbiota without repeated FMTs.
Sharma and colleagues developed an integrated biorefinery route that valorizes almond shells, an abundant lignocellulosic by-product, into two value-added products: xylooligosaccharides (XOS) and cellobionic acid (CBA). Hydrothermal pretreatment under subcritical water conditions (165.9-194.1 degrees C, 5.9-34.1 min) was optimized using response surface methodology and single-variable analysis. The optimum, chosen to maximize XOS while minimizing xylose formation, was 180 degrees C for 8 min at 10% (w/v) solids, giving 18.1 +/- 0.1 g/L XOS at 68.9 +/- 0.3% yield, with low xylose (0.4 +/- 0.0 g/L) and negligible glucose, indicating selective oligomer production and cellulose preservation. The hydrolysate contained mainly short-chain XOS with degrees of polymerization from DP2 to DP10, enriched in xylotriose and xylotetraose. The pretreated solids, containing cellulose at 15 g/L (approximately 46.3 mM), were converted to CBA by the engineered thermophilic fungus Thermothelomyces heterothallica TH-11 at 40 degrees C without added enzymes, reaching 31.8 +/- 0.6 mM CBA at 89.0 +/- 0.5% yield based on cellulose consumed. The authors frame this as an environmentally friendly strategy supporting circular bioeconomy development in the agri-food sector.
This paper reports a case involving an overdose with protodesnitazene, a previously unreported nitazene analogue with potency similar to fentanyl. The drug was initially identified by LC-QTOF-HRMS and distinguished from isomers by chromatographic separation with reference standard matching. A quantitation method using solid-phase extraction and LC-MS/MS in MRM mode was developed and partially validated for non-routine analyses. Femoral blood concentrations ranged from 77 to 222 ng/mL, comparable to previously identified desnitazene compounds. The parent drug was found in multiple postmortem matrices and in an associated seized powder. Metabolism occurred extensively via N-dealkylation, O-dealkylation, and hydroxylation; glucuronides were not prominent in blood but were prominent in urine.