8 Supported by research
There are currently no meaningful disease-modifying treatments for neurodegenerative diseases like Alzheimer's and Parkinson's disease that address the underlying disease process.
"despite all the attention on targeting proteins, misfolded proteins like beta-amyloid for Alzheimer's, we still don't really have any meaningful treatments for diseases like Alzheimer's and Parkinson's disease per se. And we certainly can treat symptoms, but as it relates to treating the underlying issue, we're falling short." (said at 0:01:10)
The host's statement accurately reflects the current consensus in scientific and clinical literature regarding disease-modifying therapies (DMTs) for neurodegenerative diseases such as Alzheimer's disease (AD) and Parkinson's disease (PD).
For Alzheimer's disease, although anti-amyloid monoclonal antibodies (such as lecanemab, donanemab, and aducanumab) have received regulatory approvals based on statistical slowing of cognitive decline and amyloid clearance, systematic reviews and meta-analyses show that these statistical differences fail to meet established minimal clinically important difference (MCID) thresholds for meaningful clinical benefit (PMID: 38253509, PMID: 39332901).
For Parkinson's disease, phase II and III clinical trials targeting alpha-synuclein and other proposed disease-modifying pathways have consistently failed to show clinical efficacy or slow disease progression (PMID: 42459575, PMID: 42098470). Consequently, while symptomatic treatments exist, established therapies that meaningfully alter the underlying disease trajectory remain elusive.
- supports: Clinically Important Benefits and Harms of Monoclonal Antibodies Targeting Amyloid for the… (Annals of family medicine 2024) · cited 92x in the literature
"Although monoclonal antibodies targeting amyloid provide small benefits on cognitive and functional scales in patients with Alzheimer dementia, these improvements are far below the MCID for each outcome and are accompanied by clinically meaningful harms." (abstract, conclusions, passage verified)
pubmedfull study (doi) - supports: Evaluating the clinical effects of GLP-1 receptor agonists for Alzheimer's and Parkinson's… (Archives of pharmacal research 2026)
"Current evidence provides no convincing support for a clinically meaningful or disease-modifying effect of GLP-1RAs, and adverse effects may limit their clinical utility." (abstract, conclusions, passage verified)
pubmedfull study (doi) - supports: The conundrum of alpha-synuclein antibody failures in Parkinson's disease: a narrative rev… (Therapeutic advances in neurological disorders 2026)
"Parkinson's disease (PD) remains the second most common neurodegenerative disorder globally, yet disease-modifying therapies remain elusive... high-profile Phase II and III clinical trials, such as those for cinpanemab and prasinezumab, failed to demonstrate clinical efficacy." (abstract, background)
pubmedfull study (doi)
Dysregulated microglia can drive neuroinflammation and brain degeneration long before clinical symptoms appear.
"what's really exciting is the emerging research on what I've called the microglia. These are the brain's immune cells. And when they're balanced, they are protecting, they are repairing. But when they're dysregulated—and we can talk about why that happens, and we do talk about it in the book—they can drive inflammation and lead to brain degeneration often long before symptoms appear." (said at 0:01:38)
Microglia function as the resident immune cells of the central nervous system, contributing to neuroprotection, surveillance, and synaptic maintenance under homeostatic conditions. However, when chronically or aberrantly activated, microglia drive neuroinflammatory pathways that promote synaptic loss and neuronal degeneration. In vivo neuroimaging studies using positron emission tomography (PET) targeting translocator protein (TSPO) have demonstrated that microglial activation and neuroinflammation occur in prodromal and preclinical stages of neurodegenerative disorders, such as Alzheimer's disease, and correlate with brain atrophy and subsequent cognitive decline.
Microglial cells are deeply influenced by daily lifestyle factors including nutrition, sleep, and environment.
"these microglial cells are deeply influenced by your day-to-day lifestyle choices, your nutrition, your sleep, your environment." (said at 0:02:01)
Extensive preclinical and translational literature demonstrates that microglia (the brain's resident immune cells) are dynamically modulated by modifiable lifestyle factors, including diet, sleep loss/deprivation, exercise, and environmental conditions. Reviews synthesizing evidence across neuroscience indicate that poor diet, chronic sleep deprivation, and environmental stressors can trigger pro-inflammatory microglial activation and synaptic pruning deficits, whereas beneficial lifestyle interventions (such as balanced nutrition, adequate sleep, and environmental enrichment) support microglial homeostatic functions and neuroprotection.
- supports: Sex differences in the outcomes of modifiable lifestyle factors for cognitive aging: neuro… (Frontiers in aging neuroscience 2025) · cited 4x in the literature
"Emerging evidence also indicates that modifiable lifestyle factors for cognitive aging can influence the brain and behavior by acting on microglia. The mechanisms identified so far involve their roles in synaptic plasticity, axonal myelination, and adult neurogenesis, exerted through the modulation of brain inflammation ('neuroinflammation'), the release of trophic factors, and phagocytosis. In this mini-review, we will cover the outcomes of exercise, diet. and social isolation on microglial functions during aging." (abstract, results, passage verified)
pubmedfull study (doi) - supports: The Function of Microglia in Cognitive Impairment Influenced by Sleep Deprivation. (Cellular and molecular neurobiology 2026) · cited 2x in the literature
"Research has found that the impact of sleep deprivation on microglia may be a key factor in cognitive impairment. The specific mechanisms through which microglia contribute to this process are not yet fully understood. It may act through multiple pathways, including the accumulation of excitatory neurotransmitters, Aβ plaque deposition, neuroinflammation, disrupted autophagy, abnormal cell death, and impaired synaptic plasticity." (abstract, results, passage verified)
pubmedfull study (doi)
Visible stroboscopic 40 Hz light stimulation can cause side effects such as nausea and headaches.
"Most use what's called stroboscopic light, and that's the type of light that flashes, and you can see the flashing, and that can cause nausea, it can cause headaches." (said at 0:22:11)
Visible stroboscopic 40 Hz light stimulation is known to cause visual discomfort, eye strain, headaches, and nausea, which has prompted the development of alternative modalities such as invisible spectral flicker (ISF) to improve tolerability and adherence during extended exposure protocols. Clinical investigations of 40 Hz sensory stimulation note that while gamma neuromodulation protocols are generally safe overall without serious adverse events, visible stroboscopic flicker presents notable discomfort and tolerability challenges compared to non-visible or continuous light paradigms.
- supports: Novel Invisible Spectral Flicker Induces 40 Hz Neural Entrainment with Similar Spatial Dis… (Journal of Alzheimer's disease : JAD 2022) · cited 26x in the literature
"Exposure to 40 Hz stroboscopic light, for one hour a day, has previously been published as a potential treatment option for Alzheimer's disease in animal models. However, exposure for an hour a day to 40 Hz stroboscopic light can be strenuous and examining other types of 40 Hz inducing stimuli is paramount if chronic treatment is wanted." (abstract, background, passage verified)
pubmedfull study (doi) - supports: Safety, Feasibility, and Potential Clinical Efficacy of 40 Hz Invisible Spectral Flicker v… (Journal of Alzheimer's disease : JAD 2023) · cited 35x in the literature
"Recent studies suggested induction of 40 Hz neural activity as a potential treatment for Alzheimer's disease (AD). However, prolonged exposure to flickering light raises adherence and safety concerns, encouraging investigation of tolerable light stimulation protocols." (abstract, background, passage verified)
pubmedfull study (doi) - context: The safety and efficacy of gamma frequency auditory and visual stimulation in the treatmen… (Translational psychiatry 2025) · cited 4x in the literature
"Eleven studies (341 participants) were included. GFAVS was safe, with no significant increase in overall adverse events (RR = 0.99, P = 0.93; RD = -0.01, P = 0.93)." (abstract, results, passage verified)
pubmedfull study (doi)
The APOE4 genetic marker is associated with cognitive decline.
"You may carry genetic markers associated with cognitive decline like as we've talked about APOE4, but possession doesn't equal expression." (said at 0:41:42)
Large meta-analyses of prospective cohort studies consistently demonstrate that carrying the apolipoprotein E epsilon 4 (APOE4) allele is significantly associated with accelerated cognitive decline and an increased risk of progression to objective cognitive impairment and dementia.
- supports: APOE ε4 and the Influence of Sex, Age, Vascular Risk Factors, and Ethnicity on Cognitive D… (The journals of gerontology. Series A, Biological sciences and medical sciences 2020) · cited 42x in the literature
"Results showed that APOE*4 carriage was related to faster general cognitive decline in women, and faster memory decline in men. A stronger dose-dependent effect was observed in older men, with faster general cognitive and memory decline in those carrying two versus one APOE*4 allele." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Predictors of cognitive deterioration in subjective cognitive decline: evidence from longi… (Journal of neurology, neurosurgery, and psychiatry 2023) · cited 38x in the literature
"Sixteen factors (66.67%) were found as predictors, including 5 SCD features... 4 biomarkers... 4 modifiable factors... 2 unmodifiable factors (apolipoprotein E4 and older age) and worse performance on Trail Making Test B." (abstract, results)
pubmedfull study (doi)
Lifestyle, nutrition, and metabolic health can influence gene expression related to brain health and cognitive resilience.
"Your lifestyle, your nutrition and metabolic health, all the things that we talked about here on the podcast can powerfully influence which genes are turned on and which stay quiet." (said at 0:41:55)
The claim is supported by scientific evidence. Lifestyle factors—including physical exercise, nutrition, and metabolic state—influence gene transcription and epigenetic regulation (such as DNA methylation, histone modifications, and non-coding RNAs) in pathways related to brain health, synaptic plasticity, neuroinflammation, and cognitive resilience.
- supports: Epigenetic and Neurogenomic Mechanisms Linking Physical Activity to Brain Plasticity and C… (Genes 2026) · cited 1x in the literature
"Available evidence, derived predominantly from animal studies and supported by more limited, often indirect human data, indicates that physical activity induces epigenetic modifications, including changes in DNA methylation, histone modifications, and microRNA expression, which contribute to lasting changes in exercise-responsive genes involved in brain plasticity. These adaptations include the upregulation of key neuroplasticity-related mediators that support neurogenesis, synaptic plasticity, angiogenesis, and metabolic adaptation, alongside the downregulation of pathways linked to neuroinflammation, oxidative stress, and apoptotic signalling." (abstract, results, passage verified)
pubmedfull study (doi) - supports: Mind-body exercise as epigenetic modulators: Rewiring neural circuits for stress resilienc… (IBRO neuroscience reports 2026)
"Recent studies suggest that MBEs may influence neurobiological systems through epigenetic regulation, including DNA methylation, histone modifications, and non-coding RNAs. This review critically evaluates the current empirical evidence linking MBEs to epigenetic changes and explores their potential downstream effects on neural circuitry and cognitive outcomes. Special attention is given to biomarkers such as brain-derived neurotrophic factor (BDNF), glucocorticoid receptor (NR3C1), and FKBP5, which are involved in stress regulation and neuroplasticity." (abstract, passage verified)
pubmedfull study (doi)
Inflammation, methylation imbalances, and oxidative stress are key drivers of brain dysfunction and neurodegeneration.
"focused on inflammation, methylation, oxidation, oxidative stress, things that we routinely discuss here on the podcast that are the key drivers of basically what makes a good brain go bad." (said at 0:42:15)
Published narrative reviews and mechanistic syntheses confirm that neuroinflammation, oxidative stress, and methylation dysregulation (including impaired DNA methylation and one-carbon/folate metabolism) are central pathological mechanisms driving brain dysfunction and neurodegenerative disorders such as Alzheimer's and Parkinson's diseases.
- supports: Targeting redox imbalance in neurodegeneration: characterizing the role of GLP-1 receptor … (Theranostics 2023) · cited 59x in the literature
"Oxidative stress, and therefore the accumulation of intracellular ROS, determines the deregulation of several proteins and caspases, damages DNA and RNA, and interferes with normal neuronal function." (abstract, passage verified)
pubmedfull study (doi) - supports: Role of Folate Metabolism in Neurodegenerative Diseases: Insight from Experimental and Cli… (Current nutrition reports 2026)
"Disruption of FOCM can lead to oxidative stress, impaired methylation, excitotoxicity, and neuroinflammation, thereby contributing to neurodegenerative diseases." (abstract, recent findings, passage verified)
pubmedfull study (doi)
Cold plunging, sauna use, and exercise act as hormetic stressors that build resilience.
"That, you know, it's why we cold plunge, we sauna, exercise, etc., because that level of stress actually builds resilience." (said at 1:04:00)
The biological concept of hormesis describes a biphasic dose-response relationship in which exposure to mild-to-moderate, intermittent physical stressors (such as exercise, heat exposure/sauna, and cold stress) triggers cellular and physiological adaptation pathways. These include the activation of heat shock proteins, antioxidant defenses (e.g., Nrf2 pathways), mitochondrial biogenesis, and neuroplasticity factors, which collectively enhance cellular and organismal resilience against subsequent challenges.
- supports: Mitoresilience: Hormesis, Psycho-physical Resilience, Mitochondria and Heart Rate Variabil… (Current aging science 2023) · cited 8x in the literature
"Research has shown that resilience can be acquired through hormesis, a set of conservative and adaptive processes based on biphasic doseresponse to specific mild stressors, such as fasting, intake of polyphenols, exercising, physical and chemical stress and mental engagement." (abstract, passage verified)
pubmedfull study (doi) - supports: The catabolic - anabolic cycling hormesis model of health and resilience. (Ageing research reviews 2024) · cited 29x in the literature
"The CACH model is based on the concept that cells and organ systems respond to catabolic challenges in ways that bolster their resilience and that an anabolic recovery period is required to effectuate the benefits of the catabolic challenge. As two prominent real-world examples we highlight the literature on the molecular and cellular mechanisms by which physical exercise and intermittent fasting bolster cellular and organismal performance and resilience, and suppress disease processes." (abstract, passage verified)
pubmedfull study (doi) - supports: Physiological aspects of hormesis. (Progress in brain research 2025) · cited 2x in the literature
"The relationship between stress and biological outcomes follows an inverted U-shaped curve, where moderate stress triggers beneficial adaptations while chronic or excessive stress leads to allostatic load and pathology. This mechanistic understanding bridges traditional concepts of homeostasis with modern views on neuroplasticity and resilience." (abstract, passage verified)
pubmedfull study (doi)
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.