Inflammation & Immune Burden
What I Watch, Why It Matters, and the Markers I Follow
One of the biggest shifts in my own understanding of APOE4 over the past few years has been realizing that Alzheimer’s disease is not simply a “brain disease.”
It is increasingly being understood as a systemic disease involving underlying biology outlined in the right column. ➡️
And for APOE4 carriers, the immune system often appears to respond differently – and sometimes more aggressively – to these stressors.
Because chronic immune activation may quietly damage the brain for decades before symptoms ever appear.
This module focuses on the inflammatory and immune markers I personally track, why I believe they matter, and the broader patterns I look for.
The manifestation of Cognitive Decline is preceded by one or more of the following:
- chronic inflammation
- immune dysregulation
- vascular dysfunction
- metabolic impairment
- mitochondrial stress
- impaired repair and recovery
- infectious burden
- environmental stressors
Why Inflammation Matters So Much in APOE4
Inflammation is not inherently bad.
Acute inflammation is protective. It helps us survive infections and injuries.
The problem is chronic low-grade inflammation that never fully shuts off.
Many APOE4 carriers appear more vulnerable to:
- exaggerated inflammatory responses
- prolonged immune activation
- impaired resolution of inflammation
- increased oxidative stress
- blood-brain barrier dysfunction
- microglial overactivation
Microglia are the brain’s resident immune cells.
When chronically activated, they may:
- damage synapses
- impair neuronal signaling
- increase oxidative stress
- worsen amyloid and tau pathology
- contribute to neurodegeneration
This is one reason why I pay close attention not only to traditional cardiovascular and metabolic markers, but also to inflammation and immune burden.
The Pattern Matters More Than One Number
I look at trends in my labs and what every APOE4 should want to know –
- Is my immune system chronically activated?
- Is inflammation creeping upward over time?
- Is there evidence of infection burden?
- Is vascular inflammation present?
- Is insulin resistance contributing to inflammation?
- Is poor sleep worsening immune regulation?
- Are environmental factors contributing?
- Is my recovery capacity declining?
The goal is not perfection.
The goal is reducing chronic inflammatory pressure over time/decades.
The Core Markers I Personally Watch
hs-CRP (High Sensitivity C-Reactive Protein)
This is probably the single inflammation marker I follow most closely.
hs-CRP is a liver-produced inflammatory protein that rises in response to systemic inflammation.
- Under 1.0 mg/L = good
- Under 0.5 mg/L = ideal target for me personally
Elevated hs-CRP may reflect:
- vascular inflammation
- visceral fat
- poor sleep
- infection
- insulin resistance
- chronic inflammatory disease
- periodontal disease
- overtraining
- environmental stress
I pay more attention to trends than isolated readings.
Homocysteine
Homocysteine is both a methylation marker and a vascular inflammation marker.
Elevated homocysteine has been associated with:
- cognitive decline
- vascular disease
- endothelial dysfunction
- brain atrophy
- impaired methylation
Many APOE4 carriers also carry methylation-related SNPs such as MTHFR.
- Ideally around 6–8 µmol/L
Elevated homocysteine may reflect:
- low B12
- low folate
- low B6
- impaired methylation
- kidney dysfunction
- chronic inflammation
Fasting Insulin
Insulin resistance is inflammatory.
Long before glucose rises, elevated insulin may already be contributing to:
- vascular injury
- oxidative stress
- neuroinflammation
- impaired brain glucose metabolism
Because APOE4 brains already appear metabolically vulnerable, I consider fasting insulin one of the most important prevention markers.
- Ideally under 5 µIU/mL
Ferritin
Ferritin is tricky.
It is both:
- an iron storage marker
- an acute phase inflammatory marker
Very high ferritin may reflect:
- inflammation
- iron overload
- liver stress
- infection
- metabolic dysfunction
Very low ferritin may impair energy and oxygen delivery.
Balance matters.
Complete Blood Count (CBC) Patterns
Things I watch include:
- neutrophil-to-lymphocyte ratio (NLR)
- elevated monocytes
- chronically low lymphocytes
- platelets trending upward
- unexplained shifts over time
Neutrophil-to-Lymphocyte Ratio (NLR)
This is an easy and surprisingly useful inflammatory marker. Use the calculator to the right to see where you are.
Higher NLR has been associated with:
- systemic inflammation
- cardiovascular disease
- poorer outcomes in many chronic diseases
- immune stress
My Personal Preference
ideally around 1–2 range
Neutrophil-to-Lymphocyte Ratio Calculator
The neutrophil-to-lymphocyte ratio, or NLR, is a simple marker of immune balance and inflammatory burden. It is calculated by dividing absolute neutrophils by absolute lymphocytes.
General interpretation: lower values often suggest a calmer inflammatory profile, while higher values may reflect infection, stress, inflammation, immune activation, medication effects, or other medical conditions. Always interpret NLR in context with the full CBC, symptoms, and clinical history.
Infectious Burden: A Major Area of Interest
This is an area I believe deserves far more attention in Alzheimer’s prevention.
There is increasing evidence linking chronic infectious burden with neurodegeneration.
Potential contributors being studied include:
- HSV-1
- periodontal bacteria
- EBV
- H. pylori
- Lyme-associated organisms
- chronic viral reactivation
This does NOT mean infections “cause” Alzheimer’s in a simplistic way.
But in genetically vulnerable individuals, chronic immune activation from latent infections may contribute to long-term inflammatory burden.
HSV-1 and APOE4
This area particularly caught my attention.
Some research suggests APOE4 carriers may be more vulnerable to the neurological effects of HSV-1.
The combination of:
- APOE4
- viral burden
- inflammation
- immune dysregulation
…may be particularly problematic.
This is one reason I personally pay close attention to:
- viral symptoms
- immune resilience
- stress load
- sleep quality
- inflammatory markers
Gut Health and Inflammation
The gut and immune system are deeply interconnected.
Gut dysfunction may contribute to:
- endotoxin exposure
- immune activation
- increased intestinal permeability
- neuroinflammation
- altered neurotransmitter signaling
This topic is important enough that the next section will be dedicated to this subject.
Lifestyle Factors That Drive Inflammation
No supplement stack can fully compensate for chronic inflammatory inputs. Some of the most powerful inflammatory drivers are not hidden in exotic lab tests and include:
- poor sleep
- chronic stress
- inactivity
- visceral fat
- insulin resistance
- loneliness
- processed food
- smoking
- alcohol excess
- untreated sleep apnea
- periodontal disease
Optional Tests Depending on Symptoms
- EBV titers
- HSV testing
- H. pylori testing
- cortisol testing
- gut microbiome testing
My Philosophy on Immune Burden
I don’t view Alzheimer’s disease as an amyloid problem. I increasingly view it as a long-term mismatch between:
- genetics
- immune activation
- metabolism
- vascular health
- environmental pressures
- aging resilience
For APOE4 carriers, reducing chronic inflammatory burden may be one of the most important things we can do.