The #1 Dementia Risk Factor Doctors Never Check (Lancet 2024)

Hearing loss nearly DOUBLES your dementia risk — and most doctors never test for it. That's just risk factor #1. The 2024 Lancet Commission identified 14 modifiable dementia risk factors and found that addressing all of them could prevent or delay 45% of future dementia cases. In this video, Dr. Thomas breaks down the 7 that matter most — backed entirely by peer-reviewed research, not headlines. 🧠 THE 7 HABITS COVERED IN THIS VIDEO: 1. Untreated hearing loss (nearly 2x dementia risk) 2. Zone 2 exercise and BDNF (brain-derived neurotrophic factor) 3. Deep sleep and the glymphatic system (clears amyloid beta + tau) 4. Blood pressure in your 40s and 50s (the real danger window) 5. Untreated vision loss (new 2024 Lancet finding) 6. Real social connection and cognitive reserve 7. High LDL cholesterol (new 2024 Lancet finding) These risk factors don't work alone — they compound. And so do the fixes. One 30-minute Zone 2 walk can lower blood pressure, improve sleep, raise BDNF, and reduce cortisol — all at once. ⏱️ TIMESTAMPS 00:00 The Truth About Dementia Prevention 00:59 Habit #1: Hearing Loss and Cognitive Decline 02:01 Habit #2: Zone 2 Exercise for BDNF 02:52 Habit #3: The Glymphatic System and Deep Sleep 03:42 Habit #4: Midlife Blood Pressure Control 04:18 Habit #5: Treating Vision Loss 05:17 Habit #6: Building Cognitive Reserve Through Connection 06:00 Habit #7: Managing LDL Cholesterol 06:45 Final Thoughts on Cognitive Protection 📚 SOURCES REFERENCED IN THIS VIDEO - Livingston et al., 2024 — Dementia prevention, intervention, and care: 2024 report of the Lancet Standing Commission, The Lancet - Hearing loss and dementia risk meta-analysis — cohort studies, relative risk 1.94 - Frontiers in Aging Neuroscience, 2025 — Zone 2 exercise, BDNF, 17 studies / 900 older adults - Elvsåsen et al., 2026 — Nature Communications — sleep, glymphatic clearance, amyloid beta and tau (RCT, 39 participants) - Lancet Commission 2024 — hypertension, vision loss, high LDL as modifiable midlife risk factors - Social connection and mortality — 148 studies, 300,000+ participants ⚠️ Dr. Thomas is not a physician. This video is for educational purposes and reflects peer-reviewed research, not medical advice. Always talk to your own doctor before making changes to your health routine. 🔔 New videos every Tuesday, Thursday, and Saturday: Tuesday = exercise science Thursday = brain health Saturday = the big picture on longevity If this helped you, hit subscribe — and drop a comment below telling me which of these 7 habits surprised you most. 👉 Watch the Zone 2 training video mentioned in this episode: [LINK] 👉 Watch the 3 sleep fixes video mentioned in this episode: [LINK] #DementiaPrevention #BrainHealth #HealthyAging #Longevity #SeniorHealth