“Dale Bredesen’s career has been guided by a simple idea: that Alzheimer’s as we know it is not just preventable, but reversible.”
Dale E. Bredesen, MD
Precision Brain Health Program
Pacific Neuro-Science Institute
Santa Monica, CA 90404
Apollohealthco.com
“Precision Medicine Treatment of Alzheimer’s Disease:
Successful Randomized Controlled Trial“
Successful Pilot Project. J Alzheimers Dis. 2022;88(4):1411-1421. PDF
Case Study: A Precision Medicine Approach to Multifactorial Dementia
and Alzheimer’s Disease.
J Alzheimers Dis Parkinsonism. 2021;11(Suppl 5):018. Epub 2021 Aug 25. PDF
ReCODE: A Personalized, Targeted, Multi-Factorial Therapeutic Program
for Reversal of Cognitive Decline.
Biomedicines. 2021 Sep 29;9(10):1348. PDF
Neuroprotective Herbs for the Management of Alzheimer’s Disease.
Biomolecules. 2021 Apr 8;11(4):543.
Reversal of Cognitive Decline in Alzheimer’s Disease.
Aging (Albany NY). 2016 Jun;8(6):1250-8. PDF
Inhalational Alzheimer’s Disease: an Unrecognized – and Treatable – Epidemic.
Aging (Albany NY). 2016 Feb;8(2):304-13. PDF
Hot Topics in Research: Preventive Neuroradiology in Brain Aging and Cognitive Decline.
AJNR Am J Neuroradiol. 2015 Oct;36(10):1803-9. PDF
ω-3 Supplementation Increases Amyloid-β phagocytosis
and Resolvin D1 in Patients with Minor Cognitive Impairment.
FASEB J. 2015 Jul;29(7):2681-9.
Reversal of Cognitive Decline: a Novel Therapeutic Program.
Aging (Albany NY). 2014 Sep;6(9):707-17. PDF
__________________________________________________
Books By Dale E. Bredesen, MD
The Ageless Brain: How to Sharpen and Protect Your Mind for a Lifetime
by Dale E. Bredesen MD, March, 2025, 384 pages
The First Survivors of Alzheimer’s: How Patients Recovered Life
and Hope in Their Own Words
Dale Bredesen MD, August, 2021, 272 pages
The End of Alzheimer’s Program: The First Protocol to Enhance Cognition
and Reverse Decline at Any Age
Dale Bredesen, MD, August 18, 2020, 352 pages
The End of Alzheimer’s: The First Program to Prevent and Reverse Cognitive Decline
by Dale Bredesen, MD, August, 2017, 320 pages
_________________________________________________________
(AI generated summary of interview transcript from Kirk Hamilton PA’s interview with Dale E. Bredesen, MD reviewed and edited by interviewer Kirk Hamilton, June 8, 2026)
Precision Medicine Approach to Alzheimer’s Disease & Cognitive Decline
Summary Overview of Interview…
Dr. Dale Bredesen describes Alzheimer’s disease and cognitive decline as a complex systems biology disorder rather than a single amyloid-driven disease. His research suggests that the brain exists in different biological “modes,” especially a connection mode versus a protection mode. In a healthy state, the brain favors synaptic growth, neuronal repair, and communication through pathways involving normal amyloid precursor protein (APP) processing, balanced tau function, neurotrophic signaling, and controlled inflammation. When exposed chronically to metabolic stress, infections, toxins, inflammation, vascular compromise, poor sleep, hormonal decline, or other threats, the brain shifts into a protective survival program. In this state, amyloid beta and phosphorylated tau may represent downstream responses involved with defense mechanisms rather than isolated causes. Bredesen originally described the “36 holes in the roof” concept, meaning many biological contributors can push the brain toward degeneration. He now describes approximately 45 interacting drivers, emphasizing that successful treatment requires identifying and correcting the individual combination of contributors.
The Precision Medicine model evaluates cognitive decline by asking two questions: “Is the process occurring?” and “Why is it occurring?” Bredesen compares modern blood biomarkers (P-Tau217) to a “hemoglobin A1c for the brain.” Newer testing such as p-tau217, GFAP (glial fibrillary acidic protein), and neurofilament light chain (NfL) may help detect early Alzheimer’s-related biology, neuroinflammation, glial activation, and neuronal injury. He recommends earlier screening because Alzheimer’s pathology may begin decades before dementia symptoms appear. Cognitive decline progresses through stages: asymptomatic risk → subjective cognitive impairment (SCI) → mild cognitive impairment (MCI) → dementia. The earlier intervention begins, the greater the opportunity to preserve function. His “cognoscopy” concept combines cognitive testing, imaging when indicated (especially MRI with volumetric analysis and cerebral blood flow measures), and laboratory investigation of metabolic, inflammatory, hormonal, infectious, vascular, nutritional, and toxic contributors.
A major theme of the interview is restoring brain energy and metabolic flexibility. Bredesen explains that the brain relies primarily on glucose and ketones for fuel. With aging, insulin resistance, metabolic syndrome, sedentary lifestyle, and inflammation, glucose utilization may decline—especially in vulnerable brain regions involved in memory. Elevated fasting insulin and impaired glucose handling may reduce the ability to generate ketones, creating a “fuel crisis.” His dietary approach, often referred to as KetoFlex 12/3, emphasizes a plant-rich, nutrient-dense, low-glycemic diet designed to restore insulin sensitivity while allowing ketone production when needed. He highlights vegetables, fiber, healthy fats, appropriate protein intake, fasting windows, avoidance of excess sugar/refined carbohydrates, and individualized modification for frail patients who may not tolerate aggressive fasting or weight loss. Gut health is emphasized because intestinal permeability, microbiome disruption, and chronic inflammation may contribute to neuroinflammation.
Treatment is presented as a personalized program involving “seven basics plus two specific interventions.” The foundational therapies include diet, exercise, sleep optimization, stress regulation, brain training, detoxification support, and targeted supplementation. Exercise improves cognition through multiple mechanisms including improved insulin sensitivity, vascular function, mitochondrial signaling, oxygen delivery, mood regulation, sleep enhancement, and increased neurotrophic factors such as BDNF. Sleep is emphasized because deep sleep supports glymphatic clearance, repair, memory consolidation, and toxin removal. Bredesen also discusses identifying hidden drivers such as infections, oral disease, toxins from mold/mycotoxin exposure, heavy metals, organic toxins, hormonal deficiencies, nutrient deficiencies, chronic stress physiology, and mitochondrial dysfunction. His goal is not a single medication solution but a comprehensive restoration of the biological environment that supports synaptic maintenance and brain resilience.
Basic Cognitive Assessment at Apollo Health
MyCQTEST.com
Brain Scan
Plasma Phosphorylated Tau 217 (p-Tau 217) – It measures a specific, altered form of the brain’s tau protein that accumulates and leaks into the bloodstream when Alzheimer’s-type brain pathology is present.
Glial fibrillary acidic protein (GFAP) – Elevated GFAP in the blood is a strong biomarker for Alzheimer’s. It tracks early accumulation of amyloid-beta plaques and ongoing neuroinflammation.
Neurofilament Light Chain (NfL) – NfL is a structural protein found specifically in the axons of neurons. It acts as a non-specific biomarker that leaks into cerebrospinal fluid and the bloodstream when nerve cells are damaged or die.
Pathophysiology of Cognitive Decline and Alzheimer’s Disease — Connectivity Mode vs Protection Mode
(AI generated summary, outline and key points of Kirk Hamilton’s interview transcript with Dr. Dale E. Bredesen reviewed and edited by Kirk Hamilton)
Dr. Bredesen explains that cognitive decline and Alzheimer’s disease represent a systems biology “mode switch” in the brain rather than simply the accumulation of amyloid plaques or tau tangles. He describes two opposing biological states: a connectivity mode, where the brain is maintaining synapses and neuronal communication, and a protection mode, where the brain shifts into a defensive state in response to ongoing threats. He compares this switch to other biological state changes, such as moving from sleep to wakefulness, where many hormones, signaling pathways, and physiologic processes change together.
1. Connectivity Mode (Brain Maintenance and Synapse Support)
According to Bredesen, in the healthy connection mode, the brain is actively:
- Making new synaptic connections
- Maintaining existing synapses
- Supporting neuronal communication and plasticity
He describes several molecular features of this state:
Amyloid Precursor Protein (APP) Processing
In connectivity mode:
- APP (amyloid precursor protein) is cleaved at a single site.
- This produces:
- sAPP-alpha
- alpha C-terminal fragment (alpha CTF)
These fragments signal both inside and outside the neuron that the brain should:
- Build synapses
- Maintain synapses
- Preserve neuronal networks
In this state:
- ApoE4 activity is “off” the DNA
- Tau remains unphosphorylated
- Tau supports neurite growth and normal neuronal structure
- REST and Reelin signaling are higher
- NF-kappa B inflammatory signaling is lower
The overall message is:
“Maintain connections, grow, repair, and preserve the neural network.”
2. Transition Into Protection Mode
Bredesen explains that multiple chronic insults can signal the brain that it needs to defend itself. These exposures push the nervous system away from connection and toward protection.
Examples he gives include:
- Pathogens
- Oral microbiome changes
- Chronic sinusitis
- Tick-borne illness
- Metabolic syndrome
- Mycotoxin exposure
- Other chronic biological threats
When these persist, the brain interprets the environment as unsafe and changes its entire signaling program.
3. Protection Mode (Defense State Associated with Alzheimer’s)
Once the brain enters protection mode these changes occur.
APP Processing Changes
Instead of being cleaved once:
- APP is now cleaved at three sites
This produces:
- Amyloid beta (Aβ)
- sAPP-beta
- Jcasp
- C-terminal fragment C31
Amyloid production increases as part of this defensive biological response.
Bredesen describes amyloid as functioning as:
- An antimicrobial peptide
- Part of the brain’s protective response
The problem occurs when the brain remains in this mode chronically.
4. Tau Changes in Protection Mode
In connection mode:
- Tau supports neuronal structure.
In protection mode:
- Tau becomes phosphorylated.
- Its charge changes.
- It separates from microtubules.
- It shifts toward a defensive function.
Phosphorylated tau also has antimicrobial properties.
Staying in this state contributes to:
- Loss of normal neuronal support
- Synaptic dysfunction
- Neurodegeneration over time
5. ApoE4 and Inflammatory Switching
Bredesen explains that ApoE4 changes activity between these states.
During protection mode:
- ApoE4 returns onto DNA
- Acts as a transcriptional repressor
- Inhibits pathways that would normally help reduce inflammation
The inflammatory balance shifts:
- Higher inflammatory signaling
- Lower repair signaling
- Less synaptic maintenance
The brain becomes focused on defense rather than connection.
6. How This Becomes Alzheimer’s Disease
According to Bredesen, protection mode itself is not the problem—it is a normal survival response.
The problem is:
Protection mode + chronic activation over years = Alzheimer’s disease process
Dr. Bredesen’s explanation:
The brain continues producing:
- Amyloid beta
- Phosphorylated tau
- Defensive inflammatory responses
while simultaneously losing:
- Synaptic support
- Neural connectivity
- Network function
Over time the brain begins “downsizing” synapses, leading to:
- Reduced cognitive performance
- Loss of brain network efficiency
- Eventually neurodegenerative disease
Dr. Bredesen describes Alzheimer’s and related disorders as:
“network insufficiencies” caused when the brain can no longer maintain its high-performance neural systems under chronic biological stress.
Simplified Clinical Model From the Interview
Healthy Brain → Connectivity Mode
✔ APP → sAPP-alpha pathway
✔ Tau supports structure
✔ Synapse creation maintained
✔ Inflammation controlled
✔ Energy and repair prioritized
⬇️
Chronic insults accumulate
- Infection
- Inflammation
- Metabolic dysfunction
- Toxins
- Stressors
⬇️
Brain → Protection Mode
✔ Amyloid increases
✔ Tau phosphorylates
✔ Immune defense activated
✔ Inflammation increases
✔ Synaptic growth decreases
⬇️
Long-Term Protection Mode
→ Synaptic loss
→ Network failure
→ Cognitive decline
→ Alzheimer’s disease phenotype
Assessment of Cognitive Function and Early Alzheimer’s Detection
(Based only on Kirk Hamilton’s interview transcript with Dale Bredesen, MD)
Dr. Bredesen explains that the goal of cognitive assessment is to identify whether a person has already shifted toward the Alzheimer’s-related “protection mode” and, if so, determine what biological factors are driving that shift. He refers to this early evaluation strategy as a “cognoscopy,” comparing it to a colonoscopy because it is designed to detect problems before advanced disease develops. The cognoscopy consists of three major components: cognitive testing, brain imaging when appropriate, and blood testing to determine both “if” cognitive decline biology is occurring and “why” it is occurring.
1. Cognitive Testing — MyCQTest.com
Bredesen states a first step in evaluating a patient’s cognition is “a very simple online cognitive assessment.”
MyCQTest.com (Cognitive Quotient Test)
- It takes approximately 20 minutes
- It is available online
- It gives a person an idea of where their cognitive function stands
Cognitive decline can begin subtly and progress through stages:
- Asymptomatic stage
- Changes may already be developing before symptoms occur
- Subjective Cognitive Impairment (SCI)
- The person notices they are not remembering or performing the way they used to
- They can still test normally on cognitive testing
- Mild Cognitive Impairment (MCI)
- Cognitive testing begins showing measurable decline
- Dementia
- Loss of ability to perform normal activities of daily living
Earlier identification provides the greatest opportunity to intervene.
2. Blood Biomarker Testing — Determining “Is There a Problem?”
Newer blood tests have changed cognitive assessment because they allow earlier detection of Alzheimer’s-related biology.
Dr. Bredesen describes these tests as answering:
“Are you on the wrong side?”
Meaning:
- Are you moving toward the protective response?
- Is the Alzheimer’s-associated process already beginning?
3. P-tau217 (Phosphorylated Tau 217)
Bredesen specifically highlights P-tau217 as one of the most important newer tests.
He explains:
- Tau changes depending on whether the brain is in:
- connection mode
- protection mode
In protection mode:
- Tau becomes phosphorylated.
Therefore, elevated P-tau217 suggests:
- The brain has shifted toward the protective state
- Alzheimer’s-related signaling may already be active
The purpose of identifying this early is to correct the underlying drivers and attempt to move the brain back toward connection mode.
4. GFAP — Glial Fibrillary Acidic Protein
The second biomarker Bredesen discusses is:
GFAP (Glial Fibrillary Acidic Protein)
He explains that GFAP tells you whether there is:
- Brain inflammation
- A repair response occurring
GFAP shows whether there is inflammation and attempted repair going on in your brain.
This fits his model because chronic inflammatory signaling is one of the factors keeping the brain in protection mode.
5. Neurofilament Light Chain (NfL)
The third blood marker is:
Neurofilament Light Chain (NfL)
This as a marker showing:
- Ongoing neuronal injury
NfL tells you if there ongoing neuronal damage
The three biomarkers together provide complementary information:
P-tau217: “Is the Alzheimer’s protection pathway activated?”
GFAP: “Is inflammation and repair activity occurring?”
NfL: “Is actual neuronal damage occurring?”
Together they help determine whether the brain is already moving toward cognitive decline biology.
6. Brain MRI Testing — Volumetrics and ASL (Arterial Spin Labeling)
Bredesen states that if a person already has symptoms, they should consider brain imaging.
He specifically mentions:
Brain MRI with:
1. Volumetrics
Purpose:
- Measure brain structures more precisely
- Detect earlier changes rather than simply saying the MRI looks normal
2. ASL — Arterial Spin Labeling (“Spinning”) MRI
An ASL (Arterial Spin Labeling) MRI is a noninvasive brain scanning technique that uses the water in your own blood as a natural contrast agent to map blood flow (perfusion).
Bredesen specifically mentions ASL (arterial spin labeling) Brain MRIs
He says he hopes more people will include
- Volumetrics
- ASL
because these provide more useful early information.
The purpose is:
- Earlier detection
- Better characterization of brain changes
- More useful information than a standard MRI read alone
These tools may help detect problems before advanced neurodegeneration has occurred.
Bredesen’s “Cognoscopy” Model
Step 1 — Cognitive Function
→ MyCQTest.com
→ “Where do I stand cognitively?”
⬇️
Step 2 — Blood Biomarkers
→ P-tau217
→ GFAP
→ NfL
Answers:
“Has the brain shifted toward protection mode?”
⬇️
Step 3 — Brain Imaging (especially if symptomatic)
→ MRI
→ Volumetrics
→ ASL arterial spin labeling
Answers:
“What structural or functional brain changes are occurring?”
⬇️
Step 4 — Determine the Drivers
Once cognitive decline biology is identified then investigates why:
- Energetic problems
- Inflammation
- Toxicity
- Reduced trophic support
- Neurotransmitter changes
- Chronic stress
with the goal of returning the brain from protection mode back toward connection mode.
Dale Bredesen, MD — The “7 Basics and 2 Specifics” for Treating Cognitive Decline
He explains that the goal is to identify what is pushing the brain into protection mode, remove those drivers, and help the brain return toward connection mode.
1. Diet
Dr. Bredesen lists diet as the first basic intervention. He explains that the purpose of the dietary approach is restoring metabolic flexibility, meaning the brain can efficiently use both:
- glucose
- ketones
He states that the brain normally uses both fuels, but with aging and insulin resistance:
- glucose utilization decreases
- insulin levels increase
- ketone production decreases
His dietary goals include:
- improving insulin sensitivity
- reducing excessive glucose exposure
- allowing ketone production when needed
He describes the diet used as a “plant-rich, mildly ketogenic diet”
- designed to combine aspects of the MIND diet and Mediterranean diet while also allowing for ketone generation.
2. Exercise
Exercise is the second basic treatment.
Exercise works through multiple pathways:
- improves blood flow
- improves oxygen delivery
- improves vascular status
- improves insulin sensitivity
- improves sleep
- improves mood
Dr. Bredesen discusses:
Strength training:
- helps insulin sensitivity
Aerobic exercise and HIIT (High Intensity Interval Training):
- improve blood flow and oxygenation
He explains that exercise affects multiple “holes in the roof” simultaneously and is one reason it has such a strong association with prevention of cognitive decline.
3. Sleep Optimization
Sleep is another core intervention. Bredesen describes sleep as another biological “mode switch.”
He emphasizes tracking:
- Total sleep
- goal: at least 7 hours
- REM sleep
- goal: at least 90 minutes
- Deep sleep
- goal: at least 60 minutes
- Oxygen saturation during sleep
- avoid significant drops (< 94)
He explains deep sleep supports:
- glymphatic function
- detoxification
- brain repair processes
Poor sleep and reduced oxygenation can contribute to impaired brain support.
4. Stress Management
Bredesen identifies stress regulation as a treatment foundation.
He distinguishes:
Helpful stress:
- short periods of challenge
- followed by recovery and adaptation
versus:
Harmful stress:
- chronic
- ongoing
- unrelenting
He explains chronic stress shifts biology toward protection mode through stress signaling pathways and increased cortisol-related responses.
He specifically mentions approaches such as:
- meditation
- yoga
because of their effects on synaptic plasticity and cognition.
5. Brain Training
Bredesen includes brain training as one of the seven basics.
Within his model, cognitive stimulation is part of supporting the brain’s ability to maintain:
- cognitive performance
- synaptic function
- brain network activity
The overall goal is supporting the brain’s movement toward connection rather than loss of neural networks.
6. Detoxification
Bredesen lists detox as another foundation.
He explains that toxins are one category of drivers pushing the brain toward protection mode.
He discusses:
Inorganic toxins:
- air pollution
- mercury
Organic toxins:
- benzene
- toluene
- microplastics
- anesthetic agents
Biotoxins:
- mycotoxins
- ochratoxin
- trichothecenes
Reducing toxic burden is part of getting the brain out of the “defensive state.”
7. Targeted Supplements
The seventh basic intervention is targeted supplements.
He emphasizes they should address identified needs.
Examples he specifically mentions:
- low vitamin D
- low omega-3 levels
Dr. Bredesen states:
“If you’re low in vitamin D, if you’re low in omega threes, you’re not going to do as well.”
The purpose is not random supplementation but correcting factors reducing brain support.
The 2 Specific Approaches
After the seven basics there are two specifics, infections and toxins. They need to be looked for.
Specific #1 — Identify and Treat Infections
Many infections may contribute to brain inflammation.
Examples discussed in the interview include:
- herpes family viruses
- HSV-1
- HSV-2
- HHV-6A
- cytomegalovirus
- Epstein-Barr virus
- varicella zoster virus
also discussed:
- oral microbiome problems
- chronic sinus inflammation
- tick-related illness
The goal is identifying inflammatory triggers keeping the brain in protection mode.
Specific #2 — Identify and Address Toxins
The second specific is toxin evaluation.
Toxins may activate protection mode and contribute to cognitive decline.
Dr. Bredesen discusses evaluating:
- environmental exposures
- heavy metals
- organic chemicals
- mold-related toxins
The Goal Is:
Remove the signals causing the brain to defend itself so it can return toward a healthier connection state.
Summary of Bredesen’s Treatment Model
Seven Basics:
- Diet → restore metabolic flexibility
- Exercise → improve blood flow, insulin sensitivity, brain support
- Sleep → repair, glymphatic function, oxygenation
- Stress management → reduce chronic protection signaling
- Brain training → support cognitive networks
- Detoxification → reduce toxic triggers
- Targeted supplements → correct deficiencies
Two Specifics:
- Identify/address infections
- Identify/address toxins
Goal:
Remove the factors driving protection mode → restore the biological environment for connection mode and synaptic support.
Targeted Nutrients Discussed by Dale Bredesen, MD for Cognitive Decline
In the interview, Dr. Bredesen lists “targeted supplements” as one of the seven basic treatments for cognitive decline. He emphasizes that supplements are not a generic protocol but should be used to correct specific deficiencies or biological problems identified during assessment.
The targeted nutrients he specifically identifies in this interview include:
1. Vitamin D
Bredesen identifies vitamin D as a key nutrient to evaluate and optimize.
He places vitamin D in the category of trophic support factors for the brain.
He explains that one contributor to cognitive decline can be:
- a reduction in trophic support for your brain
and gives examples including:
- vitamin D, estradiol and/or testosterone insufficiency
In his model, inadequate trophic support contributes to the brain moving away from optimal function.
2. Omega-3 Fatty Acids
The other targeted nutrient he specifically names is:
Omega-3s
He states that low omega-3 status may interfere with optimal outcomes.
Omega-3 status is therefore part of identifying what needs correction rather than giving everyone the same treatment.
3. Ketones / Exogenous Ketones
Bredesen spends significant time discussing ketones as a brain fuel intervention.
He explains that the brain burns two fuels:
- glucose
- ketones
With aging and insulin resistance:
- glucose utilization can decline
- insulin elevation can reduce ketone production
Dr. Bredesen recommends for those already symptomatic to use exogenous ketones to assist them in going back and forth having them use both ketones and glucose as brain fuel.
He especially discusses using exogenous ketones when patients:
- have cognitive symptoms
- need immediate brain energy support
- have difficulty generating their own ketones
He notes that thin or frail individuals may have difficulty producing endogenous ketones through fasting and may benefit from exogenous ketones.
4. MCT Oil / Coconut Oil (as Ketone-Supporting Nutritional Tools)
While discussing dietary fats, Bredesen specifically mentions:
- coconut oil
- MCT oil
He explains that saturated fats such as these MAY be acceptable depending on the overall dietary context, especially when NOT combined with:
- simple carbohydrates
- low fiber intake
His focus is on supporting metabolic flexibility rather than using one universal diet.
5. Acetyl-L-Carnitine (ALCAR)
While discussing brain energetics, Bredesen mentions a study using “combined metabolic activators.”
He specifically names:
He explains that compounds that improve energy availability showed benefit in supporting cognition through improving energetic support.
6. Glutathione (Detox Support)
When discussing patients with toxin-driven cognitive decline (“type three Alzheimer’s”), Bredesen mentions detoxification support.
He specifically lists:
- glutathione
along with:
- sauna
- fiber
- deep sleep
as part of supporting detoxification pathways.
7. Fiber (Gut, Glycemic, Lipid & Detox Support)
Bredesen repeatedly emphasizes dietary fiber, especially within the KetoFlex approach.
He describes the diet as:
“high in fiber, soluble and insoluble fiber”
and states benefits include:
- lowering glycemic load
- supporting lipid balance
- helping detoxification
What Dale Bredesen, MD Says About Trophic Hormones in Cognitive Decline
In the interview, Dr. Bredesen identifies reduction in trophic support as one of the biological contributors that can push the brain away from the healthy connection mode and toward the Alzheimer’s-associated protection mode.
He explains that after the three major categories driving cognitive decline:
- reduced energetics
- inflammation
- toxicity
there are also additional contributing categories, one of which is:
“reduction in trophic support for your brain”
He specifically identifies trophic support factors including:
- Estradiol
- Testosterone
- Vitamin D
Role of Trophic Hormones in His Model
Trophic hormones are part of the biological environment that supports:
- brain maintenance
- neuronal health
- the ability to stay in connection mode
The concept is that inadequate trophic signaling contributes to the brain losing optimal support and may be one of the “holes in the roof” that contributes to cognitive decline.
Reduced Trophic Support in Relationship to Stress Hormones
Bredesen also connects chronic stress physiology with changes in hormone balance.
He explains that chronic stress pushes the body toward a protective response:
“your cortisol is going up, you are shunting away from the sex steroids and into the stress steroids”
In this model:
Chronic stress → increased stress response → shift away from sex steroid support → contributes to protection mode biology.
Dale Bredesen, MD — Summary of the Progress in Alzheimer’s Prevention and Reversal, When to Start Screening, and His Closing Message
Dr. Bredesen explains that the understanding of Alzheimer’s disease has changed dramatically over the last several decades. He describes that when his work began, Alzheimer’s was considered a disease where essentially nothing could be done once a diagnosis was made. Patients were commonly told there was no meaningful way to delay, prevent, or reverse cognitive decline. He states that the old approach was to identify memory problems, follow patients until they progressed, and eventually diagnose Alzheimer’s disease when daily function was lost. He describes this approach as inadequate because the disease process begins long before dementia appears.
According to Bredesen, the major change over approximately 30 years of research has been recognizing Alzheimer’s as a systems biology problem rather than a single-cause disease. His laboratory studied mechanisms involving APP processing, ApoE4 biology, tau phosphorylation, molecular signaling pathways, and the factors that cause the brain to move from a connection mode into a chronic protection mode. He explains that researchers originally identified approximately 36 contributors (“holes in the roof”) and now recognize approximately 45 interacting contributors. These are not thousands of random causes but a defined group of biological drivers that can be evaluated and addressed.
He states that the major breakthrough is understanding that cognitive decline may be influenced by identifying and correcting the factors causing the brain to remain in protection mode, including problems with energetics, inflammation, toxicity, trophic support, neurotransmitters, and chronic stress. He emphasizes that the goal is not simply removing amyloid but determining why the brain is producing amyloid and phosphorylated tau signals in the first place. By removing the triggers and restoring support, the goal is to move the brain back toward connection mode, where synapses are maintained and neuronal networks function better.
Bredesen says the greatest opportunity is moving from late treatment to active prevention and early treatment. He explains that Alzheimer’s progression occurs through stages: an asymptomatic stage, subjective cognitive impairment (SCI), mild cognitive impairment (MCI), and finally dementia. He states there is much more opportunity in the earliest stages and says that people in the first two phases can do very well when addressed early.
When Does Bredesen Recommend Starting Screening?
Dr. Bredesen recommends that people begin evaluation earlier than traditional approaches.
He states:
“We recommend anyone who’s over 35 consider getting a cognoscopy.”
His reasoning:
- Alzheimer’s-related changes may begin decades before diagnosis.
- Waiting until dementia develops means significant synaptic and network loss has already occurred.
- Early detection gives the best opportunity for prevention.
He compares this idea to screening for other diseases:
Just as people do not wait for advanced colon disease before having a colonoscopy, he argues that people should not wait for advanced cognitive decline before evaluating brain health.
His Vision for Prevention
Bredesen states that his hope is:
“If everybody gets on active prevention or early treatment, then this (AD/Cognitive Decline) should be a rare problem.”
He compares it to cardiovascular prevention:
- Check risk factors early
- Identify problems before major damage occurs
- Correct lifestyle and biological contributors
He believes cognitive decline should become much less common when people evaluate:
- metabolic health
- inflammation
- toxins
- sleep
- exercise
- nutrition
- other drivers early
Bredesen’s Closing Comments From the Interview
In his final message, Bredesen emphasizes that cognitive decline is a major worldwide problem but does not have to remain that way.
His closing points:
- Cognitive decline should not simply be accepted as normal aging.
- People should evaluate risk factors early.
- Those over age 35 should consider screening.
- Prevention should begin before symptoms appear.
- Symptoms should trigger early action rather than waiting.
He states:
“If you start having symptoms, don’t assume that it’s just a normal part of aging.”
He explains that many people want a single solution, but Alzheimer’s requires addressing multiple contributors:
“It’s about silver buckshot, not silver bullet.”
His final message is that by identifying each person’s individual drivers and correcting them:
“We really can make a world with much, much less burden of cognitive decline.”
Overall conclusion from the interview:
Bredesen believes the last 30 years have moved Alzheimer’s from a late-stage, untreatable diagnosis toward a condition where earlier detection, prevention, and personalized correction of biological drivers may substantially change the course of cognitive decline.
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