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Household Pesticide 3-PBA Linked to Depression Risk in 6,502 Adults

MHD featured image for household pesticide biomarkers and depression risk.

A 2026 NHANES analysis of 6,502 adults found that urinary 3-PBA, a pyrethroid insecticide metabolite, was modestly associated with depression risk at OR = 1.02 per 1 μg/L, while self-reported household pesticide exposure weakened after full adjustment to OR = 1.43 (95% CI 0.91 to 2.25).1 The calibrated read is biomarker signal first, causal language …

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Neonatal Brain MRI Shows Gyri Are Connectivity Hubs by 38-44 Weeks

MHD featured image for neonatal MRI, cortical gyri, sulci, and early brain connectivity.

A 2026 developing Human Connectome Project analysis of 438 full-term neonates found that the newborn cortex already had an adult-like folding hierarchy: gyri connected most strongly to other gyri, sulci connected most weakly to other sulci, and structure-function coupling shifted near 41 to 42 weeks postmenstrual age.1 Research Highlights Gyri were already high-connectivity hubs: across …

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Lecanemab Blood Biomarkers Rebound Faster Than Amyloid PET After Stopping

Editorial card showing lecanemab maintenance dosing and Alzheimer's blood biomarkers with blood vials, amyloid PET imagery, and biomarker trajectory lines.

Lecanemab blood biomarkers may rebound much faster than amyloid PET after treatment stops: a 2026 PK/PD model estimated that half of the Aβ42/40 treatment effect is lost within 0.5 years, compared with 12.1 years for amyloid PET signal.1 Research Highlights 0.5-year rebound for Aβ42/40: Bhagunde et al. estimated that half of the Aβ42/40 treatment effect …

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Residual Sleepiness in Treated Sleep Apnea Linked to Memory Deficits

Stylized sleep-apnea treatment scene with CPAP, daytime sleepiness testing, and memory-task circuitry, representing cognitive deficits linked to residual sleepiness despite PAP adherence.

Some sleep apnea patients stay sleepy even when their CPAP is used 6+ hours a night and apnea events have been driven back to normal range. A 2026 cross-sectional study of 65 PAP-adherent adults found those residually sleepy patients performed measurably worse on global cognition, memory, executive function, attention, and processing speed than their well-rested …

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Child and Adult Adversity Doubled Frailty in UK Biobank

Editorial card showing a life-course timeline with biological aging biomarkers, illustrating how cumulative childhood and adult adversity stack on the frailty index.

A 2026 UK Biobank analysis by Aas et al. in BMC Medicine tests the “adversity leaves a fixed biological scar” framing against five biological aging markers in 153,557 middle-aged and older adults — and the marker that moves most reliably isn’t telomere length or any metabolomic clock.1 Research Highlights 153,557-participant test: Aas et al. measured …

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AI Levodopa Timing Improved UPDRS 4.4 Points in 5 Parkinson Patients

MHD featured image for AI-guided levodopa dosing in Parkinson's disease.

A 2026 open-label feasibility trial involving 5 Parkinson’s disease patients found that app-randomized levodopa timing was associated with a mean 4.4-point improvement on the Unified Parkinson’s Disease Rating Scale, but the signal missed conventional statistical significance at p = 0.063.1 The narrow conclusion is feasibility: this was a dosing experiment that justified a blinded controlled …

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CARES Addiction Risk Screening: 15-Stakeholder Preprint

MHD featured image for CARES addiction risk screening implementation.

A 2026 medRxiv preprint interviewed 15 health-system stakeholders about CARES, a freestanding addiction-risk screening platform, and found a clear implementation split: people wanted better substance-use prevention tools than current clinic screening, but provider burden, stigma, knowledge gaps, and medical-record liability could block uptake.1 Research Highlights Stakeholders saw a screening gap: all 15 interviewees held leadership …

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