Alzheimer’s Prevention and Brain Health: What You Can Do Starting Today

In my practice here in Raleigh I want to use this post to talk about something that gets underemphasized in conventional medicine: how much influence you actually have over your long-term brain health. Alzheimer’s disease is not purely a matter of genetics and bad luck. The research is increasingly clear that lifestyle factors, environmental exposures, and what you put in and on your body play a significant role in both risk and protection.

That doesn’t mean Alzheimer’s is entirely preventable or that people who develop it weren’t taking care of themselves. This is a complex disease with multiple contributing factors, and some of them are not in our control. But a meaningful portion of dementia risk is modifiable, and the window for intervention is earlier than most people think. Changes you make in your 40s and 50s matter far more than changes you make after symptoms appear.

Here’s what the evidence actually shows.

Risk Factors You Can’t Control

It’s worth being honest about what you can’t change, because understanding your fixed risk profile helps you know how aggressively to address the things you can.

Age is the single biggest risk factor. The risk of Alzheimer’s roughly doubles every five years after age 65. Family history matters, particularly if a first-degree relative developed early-onset Alzheimer’s. The APOE-e4 gene variant is the most well-known genetic risk factor and increases lifetime risk significantly, though having it does not mean you will develop the disease, and not having it does not mean you won’t. Genetics set the stage. Lifestyle determines a great deal of what happens on it.

Risk Factors You Can Control

This is the more important list, and it’s longer than most people expect. Research published in The Lancet identified twelve modifiable risk factors that together account for around 40% of dementia cases worldwide. They include: low education in early life, hearing loss, high blood pressure, obesity, excessive alcohol use, traumatic brain injury, smoking, depression, social isolation, physical inactivity, air pollution, and diabetes. Most of these are things primary care addresses directly. Managing blood pressure, blood sugar, weight, and mood aren’t just cardiovascular interventions. They are brain health interventions.

Chronic inflammation deserves particular attention. Neuroinflammation is increasingly understood as a central driver of Alzheimer’s pathology, not just a consequence of it. Anything that drives systemic inflammation, including poor diet, sedentary behavior, chronic stress, poor sleep, gut dysbiosis, and metabolic dysfunction, also drives neuroinflammation over time. Reducing your overall inflammatory burden is one of the most direct things you can do for your brain.

What to Avoid

This section matters and doesn’t get enough attention in mainstream health conversations. Several common exposures have been linked to increased Alzheimer’s risk, and while causation is not always fully established, the precautionary case for reducing exposure is strong.

Aluminum

The relationship between aluminum exposure and Alzheimer’s has been studied for decades and remains somewhat contested, but the weight of evidence is concerning enough to take seriously. Aluminum has been found in elevated concentrations in the brain tissue of Alzheimer’s patients. It is a known neurotoxin with no established biological role in the human body. Common sources of exposure include aluminum-containing antiperspirants applied to the underarm skin directly over lymph nodes, aluminum cookware and foil especially when cooking acidic foods, aluminum-containing antacids, and processed foods with aluminum-based additives. Switching to an aluminum-free deodorant is an easy, low-cost change that removes one significant route of ongoing exposure. It won’t prevent Alzheimer’s on its own, but it’s a reasonable precaution given the body of evidence.

Pesticides and Environmental Toxins

Organophosphate pesticides, glyphosate, and certain heavy metals including lead and mercury have all been associated with increased neurodegenerative disease risk. Glyphosate deserves specific mention here. Independent testing by organizations like the Environmental Working Group has found glyphosate residues in a majority of conventionally grown wheat products tested in the US, including breads, cereals, and flour. The reason is a practice called preharvest desiccation, where glyphosate is sprayed directly on wheat crops shortly before harvest to dry them out and standardize timing. That means the residue ends up in the grain itself, not just on the outer surface. Most of the bread, pasta, cereal, and crackers on a conventional grocery store shelf has measurable glyphosate residue. Choosing organic wheat products eliminates this exposure, since organic certification prohibits glyphosate use.

I want to say something directly here: do not rely on the FDA or any regulatory agency to protect you from this. The acceptable residue limits set by regulators are influenced by industry and often lag far behind what independent research shows to be harmful. You are your own best advocate. Do the research, ask the questions, and make informed choices for yourself and your family. Eating organic, filtering your water, and minimizing processed food are not paranoia. They are rational responses to what the evidence actually shows.

Filtering your drinking water is worth considering regardless of your water source. City water and well water alike can contain fluoride, heavy metals, pesticide runoff, and other contaminants that conventional municipal treatment doesn’t fully remove. A high-quality filter that addresses these, such as a reverse osmosis system or a Berkey filter, is a worthwhile investment for long-term brain and overall health.

Ultra-Processed Food and Refined Sugar

Alzheimer’s is sometimes referred to informally as Type 3 diabetes, a term that reflects the strong relationship between insulin resistance and cognitive decline. Chronically elevated blood sugar and insulin dysregulation damage blood vessels throughout the body, including the small vessels that supply the brain, and impair the brain’s ability to use glucose efficiently. A diet high in refined sugar and ultra-processed food drives this process. It also drives neuroinflammation directly through the production of advanced glycation end-products, compounds formed when sugar binds to proteins and fats in ways that promote oxidative stress.

Chronic Sleep Deprivation

Sleep is when the brain runs its waste clearance system. The glymphatic system, a network of channels that surrounds blood vessels in the brain, flushes out metabolic waste during sleep, including amyloid beta, the protein that accumulates into the plaques associated with Alzheimer’s. Chronic sleep deprivation impairs this clearance process and allows amyloid to accumulate faster. Even a few nights of poor sleep measurably increases amyloid levels in the brain. This is not a small effect. If there is one intervention with the clearest and most direct connection to Alzheimer’s risk reduction, prioritizing quality sleep is it.

What Protects the Brain

Diet

The MIND diet, a hybrid of the Mediterranean and DASH diets specifically designed with brain health in mind, has the strongest evidence base for cognitive protection. It emphasizes leafy green vegetables daily, other vegetables, berries (particularly blueberries and strawberries, which are among the highest antioxidant foods available), nuts, olive oil, whole grains, fish, beans, and poultry, while limiting red meat, butter, cheese, pastries, and fried food. Berries in particular deserve mention. The flavonoids in blueberries have been shown to reduce neuroinflammation, improve blood flow to the brain, and support the growth of new neurons. Fatty fish high in omega-3s (especially DHA) are critical structural components of brain cell membranes and have well-documented neuroprotective effects. Turmeric, and its active compound curcumin, has shown promising anti-inflammatory and anti-amyloid effects in research, though bioavailability is a challenge without black pepper or a fat source to enhance absorption.

Exercise

Physical exercise is one of the most powerful brain health interventions we have. It increases BDNF (brain-derived neurotrophic factor), which supports the growth, maintenance, and survival of neurons. It improves blood flow to the brain, reduces neuroinflammation, supports insulin sensitivity, and has been shown to increase the volume of the hippocampus, the brain region most affected early in Alzheimer’s and most involved in memory formation. Both aerobic exercise and resistance training have cognitive benefits, and combining the two appears to be most effective. The research suggests that regular moderate exercise can reduce Alzheimer’s risk by 30-40%. That is a significant effect size by any measure.

Sleep

As mentioned above, sleep is when the brain clears amyloid and other metabolic waste. Seven to nine hours of quality sleep per night is the target for most adults. Sleep position matters too: research suggests that sleeping on your side, rather than your back or stomach, optimizes glymphatic drainage. Addressing sleep apnea is particularly important, as untreated sleep apnea significantly increases dementia risk through repeated oxygen deprivation and sleep fragmentation.

Social and Cognitive Engagement

Social isolation is a documented risk factor for dementia, and the mechanism is biological as well as behavioral. Meaningful social connection reduces cortisol, supports immune function, and keeps the brain actively engaged in complex, unpredictable interactions that provide ongoing cognitive stimulation. Learning new skills, playing instruments, learning a language, reading, engaging in creative work, and any activity that challenges the brain to do something new builds what researchers call cognitive reserve, essentially a buffer that allows the brain to sustain more damage before symptoms appear.

Stress Management

Chronic stress elevates cortisol, and chronically elevated cortisol is neurotoxic. It damages the hippocampus over time and impairs the brain’s ability to form and retrieve memories. The same nervous system regulation practices we discussed in last month’s mental health post, breathwork, meditation, time in nature, yoga, vagal toning, apply directly here. Managing stress is not a soft recommendation. It is a structural brain health intervention.

Protective Compounds Worth Knowing About

A few specific compounds have emerging or established evidence for neuroprotection that are worth discussing with your provider.

Niacin (Vitamin B3 / Nicotinic Acid): This is one of the more interesting areas of brain health research. Niacin has long been used for cholesterol management, but research has shown that it also supports neuronal repair, reduces neuroinflammation, and may help clear amyloid. A large observational study found that higher dietary niacin intake was associated with significantly reduced risk of Alzheimer’s and age-related cognitive decline. The form matters: nicotinic acid (niacin) is the form with the most evidence, distinct from niacinamide and the newer NMN/NR compounds, though all have some research behind them. Niacin causes a harmless flushing reaction in many people that can be managed by starting at a low dose and titrating up. As always, discuss supplementation with your provider before starting.

Nicotine (Not Tobacco): This one surprises people, but the research is worth knowing about. Nicotine, the compound itself and not the tobacco plant or smoking, has shown genuine neuroprotective properties in multiple studies. It binds to nicotinic acetylcholine receptors in the brain, which are directly involved in memory, attention, and cognitive processing. These same receptors are progressively lost in Alzheimer’s disease. Researchers at Vanderbilt University and elsewhere have studied low-dose nicotine patches specifically for mild cognitive impairment, with promising results for attention and memory. The critical distinction is delivery method. Smoking is neurotoxic and a documented dementia risk factor due to vascular damage, carbon monoxide exposure, and thousands of other compounds in tobacco smoke. That has nothing to do with isolated nicotine at low therapeutic doses. If this is something you want to explore, it is worth a conversation with your provider about whether it makes sense for your situation, rather than self-prescribing.

Peptides: This is an emerging area that deserves mention, with the honest caveat that most of the research is still preclinical or early-stage. Peptides are short chains of amino acids that can signal specific biological processes in the body. Several have shown neuroprotective or neurotrophic properties in research settings.

Semax, a synthetic peptide derived from a fragment of ACTH (a hormone produced in the brain), has the most brain-specific research, primarily from Russian and Eastern European literature. It has been shown to increase BDNF, support neuronal survival, reduce neuroinflammation, and improve cognitive function in both animal models and some human studies. It is used clinically in several countries for cognitive impairment and stroke recovery.

BPC-157, better known for its gut healing and tissue repair properties, also has some neurological research behind it, including effects on dopamine and serotonin pathways and potential neuroprotective properties. Dihexa is another compound that has shown remarkable potency for BDNF-related pathways in animal studies, though human research is very limited at this stage.

Peptides as a category are genuinely exciting for brain health but we are early in the research. Anyone interested should work with a provider who understands this space rather than sourcing and dosing independently, both for safety and because quality and purity of peptide products vary widely.

Lion’s Mane Mushroom: This functional mushroom stimulates the production of nerve growth factor (NGF), a protein that supports the growth and maintenance of neurons. It has shown promising results in studies for mild cognitive impairment and is one of the better-studied natural compounds for neuroregeneration. It is available as a supplement and is generally well tolerated.

Omega-3 Fatty Acids (DHA in particular): DHA is the primary structural fat in brain cell membranes and is critical for neuronal signaling. Low DHA levels are associated with accelerated cognitive decline. Getting DHA from wild-caught fatty fish is ideal; supplementing with a high-quality fish oil or algae-based omega-3 is appropriate for people who don’t eat fish regularly. Again, discuss with your provider, as omega-3 supplementation can interact with blood thinners and other medications.

Vitamin D: Low vitamin D levels are consistently associated with increased dementia risk. Vitamin D receptors are found throughout the brain, and it plays roles in neuroinflammation regulation, amyloid clearance, and neuronal protection. A significant portion of the population is deficient, often without knowing it. Getting your vitamin D level checked is a simple step with meaningful implications for brain health, among many other things. And as we’ve said before: don’t supplement without knowing your baseline level first.

Magnesium: Magnesium threonate in particular has shown an ability to cross the blood-brain barrier and increase brain magnesium levels, which supports synaptic plasticity and has shown promise for cognitive function in research. Magnesium deficiency is common and contributes to poor sleep, anxiety, and muscle tension as well.

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