2026-02-24
SIRT3 and Mitochondrial Integrity: NAD-Dependent Deacetylase, Caloric Restriction Mimicry, and Activators
SIRT3 is the primary mitochondrial sirtuin — a NAD-dependent deacetylase that regulates ATP synthesis, ROS detoxification, and fatty acid oxidation. Its activity declines with age and NAD+ depletion. Activators include honokiol, urolithin A, and exercise, though human trial data is thin.
2026-02-24
GLP-1 Agonists and Aging: Metabolic Benefits, Cardiovascular Evidence, and Longevity Implications
GLP-1 receptor agonists like semaglutide have demonstrated cardiovascular and metabolic benefits beyond weight reduction. This review covers the mechanistic basis, major trial evidence, and the open questions about their role in longevity medicine.
2026-02-24
Gut Barrier Integrity in Aging: Intestinal Permeability, Inflammaging, and Support
Age-related increases in intestinal permeability ("leaky gut") allow bacterial products including lipopolysaccharide (LPS) to enter systemic circulation, driving chronic low-grade inflammation associated with multiple aging-related conditions. Evidence-based interventions include dietary fiber, fermented foods, and specific probiotics — though research on reversing permeability changes in older humans is in early stages.
2026-02-24
Age-Related Hearing Loss: Mechanisms, Cognitive Links, and Nutritional Support
Age-related hearing loss (presbycusis) affects over 60% of adults over 70 and independently accelerates cognitive decline. This article reviews the mechanisms and the limited but growing evidence base for nutritional support.
2026-02-24
Intermittent Fasting and Aging: Metabolic Benefits, Muscle Risk, and Evidence Review
Intermittent fasting (IF) protocols — including 16:8 time-restricted eating and 5:2 alternate-day approaches — produce modest metabolic benefits similar to matched caloric restriction. Autophagy induction is mechanistically plausible but not confirmed in humans at the cellular level during typical IF windows. Muscle mass preservation requires attention to protein timing and resistance training.