I’ve Just Discovered I Have the APOE4 Gene… Now What?
A Naturopath’s Guide to Staying Symptom-Free for Life
Naturopath Jennifer Harrington explains why discovering your APOE status is not a diagnosis, but an opportunity.
There’s a moment that many people remember clearly.
You weren’t looking for it.
You weren’t experiencing symptoms.
You may have been doing a routine genetic test, exploring your health data, or simply curious.
And then it appears.
APOE4.
For some, it lands heavily. Because somewhere along the way, APOE4 has become closely associated with Alzheimer’s disease.
But here’s the truth to hold onto:
Having the APOE4 gene does not mean you will develop dementia.
And equally important…
Many people develop dementia without carrying APOE4 at all.
This is not a diagnosis.
It’s a risk signal.
And in clinical practice, a risk signal is something we can work with.
APOE4 Is About Risk, Not Destiny
The APOE4 gene plays a role in lipid transport, inflammation, and brain repair. It can be associated with an increased risk of neurodegenerative conditions.
But risk is not certainty.
It’s not simply about whether you carry the gene...
it’s about whether your environment and biology activate it.
This is where the work of Dale Bredesen becomes so important.
He describes cognitive decline not as a single disease, but as a protective response to multiple stressors—metabolic, inflammatory, toxic, infectious, and more.
In other words:
The brain doesn’t “fail” randomly.
It responds to imbalance.
And if we can identify and reduce those imbalances, we can influence the trajectory.
You Can Live Your Entire Life Without “Switching On” This Gene
From a functional and naturopathic perspective, genes are not fixed outcomes.
They are instructions, and those instructions are influenced by your internal environment.
This is the essence of epigenetics.
You may carry APOE4…
but whether it expresses is shaped by:
metabolic health
inflammation
toxic exposure
lifestyle inputs
Understanding this shifts the conversation from fear… to strategy.
The Real Question Isn’t “Do I Have the Gene?”
It’s “What Is My Current Terrain?”
At Mito Core, we always come back to one principle:
You can’t personalise a plan without a baseline.
If you’ve discovered you carry APOE4, the next step isn’t panic.
It’s precision.
Because cognitive risk is not driven by one factor, it’s influenced by a network of interconnected systems.
16 Key Areas to Investigate (and Optimise)
Rather than chasing a single cause, we look at the terrain as a whole.
1. Metabolic Health & Blood Sugar Regulation
Insulin resistance is one of the strongest drivers of cognitive decline.
Your brain is highly energy-dependent, and when glucose metabolism becomes impaired, the brain struggles.
2. Inflammation & Immune Activation
Chronic, low-grade inflammation, often silent, can drive neuroinflammation.
This may be influenced by diet, stress, gut health, infections, and environmental triggers.
3. Infections & Microbial Load
Emerging research suggests certain infections may play a role in cognitive decline.
This includes viral, bacterial, and oral pathogens, but also more persistent, harder-to-detect organisms such as spirochetes.
Spirochetes (including those associated with Lyme disease and certain oral infections) have been identified in brain tissue in some neurodegenerative conditions. These organisms can:
trigger chronic immune activation
contribute to inflammation
disrupt normal neuronal function
From a functional perspective, the brain may be responding protectively to these microbial threats.
4. Dental & Oral Health
Often overlooked, but critically important.
The mouth is not separate from the brain; chronic gum disease and oral infections can contribute to systemic inflammation.
5. Toxic Load & Environmental Exposure
This includes:
Heavy metals (especially excess iron, mercury, and lead)
Mould exposure
Chemicals and pollutants
Electromagnetic field (EMF) exposure
These factors can disrupt mitochondrial function and increase oxidative stress over time.
6. Nutritional Status
Your brain requires specific nutrients to function and repair.
We often assess:
B vitamins
Omega-3 fatty acids
Antioxidants
Minerals
Deficiencies, or imbalances, can impair neuronal function and resilience.
7. Gut Health & Microbiome
Your gut and brain are deeply connected.
Imbalances in the microbiome can influence inflammation, mood, cognition, and immune function.
8. Sleep Quality (Including Sleep Apnoea Risk)
Sleep is when your brain clears waste products via the glymphatic system.
But it’s not just about how long you sleep, it’s about how well you breathe during sleep.
Sleep apnoea is a major, often undiagnosed contributor to cognitive decline.
Repeated drops in oxygen overnight can:
impair brain repair
increase oxidative stress
disrupt memory consolidation
drive vascular and metabolic dysfunction
If there is snoring, waking unrefreshed, or daytime fatigue, this should be investigated.
9. Movement, Exercise & Vascular Health
Exercise supports:
blood flow to the brain
mitochondrial function
insulin sensitivity
neuroplasticity
But we also need to consider vascular integrity more broadly.
Compromised blood flow, whether through endothelial dysfunction, hypertension, or microvascular changes, can significantly impact brain health over time.
10. Sunlight & Circadian Rhythm
Natural light exposure regulates:
sleep-wake cycles
hormone balance
mitochondrial signalling
Disruption to circadian rhythm is a hidden driver of metabolic and neurological dysfunction.
11. Hormonal Balance
Hormones play a direct role in brain function and resilience.
Imbalances, whether related to stress hormones, thyroid function, or sex hormones, can impact:
memory
mood
sleep
neuroprotection
12. Social Connection & Cognitive Engagement
Your brain thrives on stimulation and connection.
Isolation is a risk factor. Engagement is protective.
13. Sensory Health (Vision, Hearing, Smell & Taste)
Sensory input plays a far greater role in brain health than most people realise.
Declines in vision and hearing are already well established as risk factors for cognitive decline, but changes in smell and taste are also important early indicators.
The olfactory system (sense of smell) has a direct connection to brain regions involved in memory and cognition. A reduced or altered sense of smell may reflect early neurological changes, sometimes years before other symptoms appear.
Taste is closely linked and can be influenced by neurological function, nutrient status, and overall metabolic health.
Supporting sensory health, and investigating changes early, can provide valuable insight into brain function and may offer an important opportunity for early intervention.
14. Head Trauma & Concussions
Even mild head injuries can contribute to long-term neurological risk.
This is an area that should never be overlooked.
15. Stress & Emotional Load
Chronic stress alters brain structure and function over time.
Supporting the nervous system is foundational.
16. Trophic Support & Brain Repair Capacity
Your brain relies on trophic factors, chemical messengers that support:
neuron survival
synaptic connections
repair and regeneration
When trophic support is reduced (due to inflammation, poor nutrition, stress, or metabolic dysfunction), the brain shifts into a more protective, energy-conserving state.
Over time, this can contribute to cognitive decline.
Supporting these pathways is essential for long-term brain resilience.
What Most People Get Wrong
When people discover APOE4, they often look for:
one supplement
one diet
one “fix”
But cognitive health is not built on a single intervention.
It’s built on creating an internal environment where the brain can function, repair, and thrive.
This Is Not a Death Sentence, It’s a Window of Opportunity
Discovering your APOE status, especially before symptoms, can be one of the most valuable insights into your future health.
Because prevention is where the greatest impact lies.
You have time.
You have influence.
You have the ability to shift your trajectory.
Looking Ahead
At Mito Core, we help you uncover your unique risk factors and potential triggers. By identifying and addressing these, we can work with your biology to help minimise the likelihood of this gene being expressed.
In our next 2 articles, we’ll explore what to do if symptoms are already present, and how the advanced technologies at Mito Core may support brain function, resilience, and recovery.