2026-02-24
Circadian Rhythm Disruption in Aging: Mechanisms, Health Consequences, and Restoration
Circadian clocks govern virtually every physiological process — metabolism, immune function, DNA repair, and hormone secretion follow 24-hour rhythms entrained by light. With aging, the circadian system weakens: clock gene amplitude declines, light sensitivity decreases, and circadian outputs desynchronize. Strengthening circadian inputs through light exposure, meal timing, and physical activity has evidence-based effects on sleep, metabolic health, and biological aging.
2026-02-24
Sleep Architecture in Aging: Why Deep Sleep Declines and How to Partially Restore It
Slow-wave sleep (deep sleep) declines approximately 2% per decade from early adulthood, dropping from roughly 20% of total sleep in young adults to under 5% in adults over 70. This decline is not simply reduced sleep duration — it represents a fundamental change in sleep architecture with consequences for metabolic health, memory consolidation, and cellular repair.
2026-02-24
Estrogen, Menopause, and Aging: Hormonal Mechanisms, Health Implications, and Protocol
Menopause-associated estrogen decline drives accelerated changes in cardiovascular risk, bone density, cognitive function, and metabolic health. Menopausal hormone therapy (MHT) has RCT and observational evidence supporting benefits for symptomatic relief and bone protection; cardiovascular and breast cancer risks depend on timing, type, and route of administration.
2026-02-24
Menopause and Perimenopause: Supplement Evidence for Hot Flashes, Bone Loss, and Cognitive Symptoms
The menopausal transition accelerates bone loss, cognitive change, sleep disruption, and cardiovascular risk. Supplement evidence varies sharply: isoflavones have modest hot flash data; calcium and vitamin D are well-supported for bone; magnesium helps sleep. Black cohosh is used widely but evidence is mixed.
2026-02-24
Tobacco, Smoking, and Aging: Health Damage and Evidence-Based Cessation Support
Tobacco is the leading preventable cause of accelerated aging, cardiovascular disease, and cancer. This article covers the biological mechanisms and evidence-based support for cessation and harm mitigation.