Maki & Henderson 2023 in Lancet Healthy Longevity named it: the neuroenergetic transition. Estrogen helps glucose cross the blood-brain barrier and helps neurons use it efficiently. When estrogen drops, brain fuel availability drops. The fog is metabolic, not psychological.
The neuroenergetic transition is real, measurable on PET scans, mostly temporary if the brain transitions cleanly to ketone fuel. The 4-minute morning protocol that helps the transition. The HRT conversation that addresses the upstream cause.
Read the cover story →The 3-4 follow-up articles that go deepest on your situation.
The upstream intervention for the neuroenergetic transition. The 10-year window and what to ask your doctor.
Deep sleep is when the glymphatic system flushes brain plaque. Compromised deep sleep is compromised cognition.
Bring it to your visit. The conversation that addresses the upstream cause.
Each product is something we have read the trials on or personally used. Evidence note included. Some links are affiliate — disclosed on every CTA. No supplement-brand sponsorships, ever.
Sleep architecture is the modifiable variable upstream of cognitive function. REM sleep specifically consolidates the memory and emotional processing that fog disrupts. Oura tracks the variable that matters.
Menopause-trained clinicians prescribe systemic and topical HRT online. Patch, gel, oral, pellet — full formulation range. The upstream brain-fog intervention is HRT when in the window.
The morning protein + nutrient density habit that supports the neuroenergetic transition. Not a magic bullet — a tool to make the daily protocol easier when you're foggy in the morning.
The upstream cognition intervention is HRT for many women. The readiness calculator estimates where you fall in the 10-year window.
Open the tool →The course for women whose cognitive symptoms are time-locked to perimenopause. 6 modules on the conversation, the dose, the side-effects, the long-term plan.
See the course →The Sunday letters most relevant to your stated concern. Free, sent weekly, reply to anything.
One long-form research-led piece every Sunday. Free forever. Reply to anything — Alexander reads every response.