Protecting Brain Health: What are the Root Causes of Alzheimer’s Disease?
Dr. Tracy Tranchitella, ND | Sunrise Functional Medicine
When people think about Alzheimer’s disease, they often picture memory loss that appears suddenly in later life. In reality, the changes associated with Alzheimer’s may begin years—or even decades—before symptoms become obvious. By the time forgetfulness and confusion interfere with daily life, the underlying processes have often been developing quietly for a long time. This is one reason prevention has become such an important focus in functional medicine.
According to Alzheimer’s Association, there is a strong relationship between Alzheimer’s disease and Cardiovascular Disease. The same factors that damage the heart and blood vessels can also affect the brain. Inflammation, blood sugar imbalance, poor circulation, and chronic infections may all contribute to a gradual decline in cognitive health. While researchers continue to investigate exactly what causes Alzheimer’s, a growing body of evidence suggests that it is rarely the result of a single issue. Instead, it appears to arise from a combination of genetic, metabolic, inflammatory, and lifestyle-related factors. This broader perspective offers something encouraging: many of the underlying contributors can be identified and addressed long before significant memory problems develop.
More Than Plaques and Tangles
Alzheimer’s disease is traditionally identified by two hallmark features in the brain: beta-amyloid plaques and neurofibrillary tangles made of tau protein. For many years, these abnormalities were considered the primary cause of the disease. Today, researchers recognize that the picture is more complicated.
These proteins may be part of the brain’s response to injury, infection, inflammation, or impaired circulation. In other words, plaques and tangles may not simply be the cause of Alzheimer’s—they may also be evidence that the brain has been trying to protect and repair itself. This shift in thinking changes the conversation from “How do we remove plaques?” to “What is driving the brain to produce them in the first place?”
Common Risk Factors You May Already Know
Many of the risk factors associated with Alzheimer’s are the same ones linked to heart disease and other chronic illnesses. These include:
- High blood pressure
- High cholesterol
- Type 2 Diabetes
- Obesity
- Sedentary lifestyle
- Smoking
- Excessive alcohol use
- Depression
- Social isolation
- Traumatic brain injury
- Chronic infections
- Periodontal disease
- Gut imbalance
- Nutritional deficiencies
- Exposure to environmental toxins
What these conditions have in common is their tendency to promote inflammation, oxidative stress, and reduced blood flow to the brain.
Why Heart Health and Brain Health Are Closely Connected
The brain depends on a constant supply of oxygen and nutrients delivered through an intricate network of blood vessels. Anything that interferes with circulation can affect memory, concentration, and long-term cognitive function. High blood pressure can damage delicate vessels in the brain. Atherosclerosis can reduce blood flow. Tiny strokes may occur without obvious symptoms but still contribute to gradual cognitive decline. This connection helps explain why individuals with cardiovascular disease have a significantly higher risk of developing Alzheimer’s disease.
The encouraging news is that steps taken to support heart health—improving diet, managing blood pressure, maintaining healthy cholesterol levels, and exercising regularly—also help protect the brain.
The Role of Blood Sugar and “Type 3 Diabetes”
One of the most fascinating areas of Alzheimer’s research involves insulin resistance. Insulin does more than regulate blood sugar. It also plays an important role in communication between brain cells and supports learning and memory. When the brain becomes less responsive to insulin, inflammation increases, energy production declines, and the accumulation of beta-amyloid may accelerate. Because of this, some researchers refer to Alzheimer’s as “type 3 diabetes.” This does not mean everyone with diabetes will develop Alzheimer’s, but it does highlight the importance of maintaining stable blood sugar levels throughout life.
The Gut-Brain Connection
The digestive system and the brain are in constant communication through what is known as the gut-brain axis. When the intestinal lining becomes compromised, inflammatory compounds and bacterial toxins such as lipopolysaccharides (LPS) can enter the bloodstream. These substances may cross into the brain and contribute to neuroinflammation.
An unhealthy gut microbiome has also been linked to cardiovascular disease, poor blood sugar control, and immune dysfunction—all of which are associated with cognitive decline. Supporting digestive health with a nutrient-dense diet, adequate fiber, stress management, and treatment of underlying gut issues may have benefits that extend far beyond digestion.
Oral Health Matters Too
The mouth is another often-overlooked source of chronic inflammation. Research has identified bacteria associated with periodontal disease in the brains of individuals with Alzheimer’s disease. Chronic gum infections may increase systemic inflammation and potentially influence processes involved in neurodegeneration. Daily brushing and flossing, regular dental care, and prompt treatment of gum disease may play a more important role in long-term brain health than many people realize.
Inflammation: The Common Denominator
Inflammation is a normal and necessary part of the healing process. Problems arise when inflammation becomes chronic. Persistent inflammation activates immune cells in the brain called microglia. These cells are designed to protect the nervous system, but when they remain switched on for too long, they can release chemicals that damage neurons and perpetuate a cycle of oxidative stress and tissue injury. This chronic inflammatory state is increasingly recognized as one of the central drivers of Alzheimer’s disease.
Prevention Starts Earlier Than Most People Think
The changes that lead to Alzheimer’s often begin in midlife, long before symptoms are noticed. This means the best time to support brain health is not after memory problems develop, but years beforehand. Fortunately, the same habits that reduce the risk of heart disease and diabetes also promote healthy aging and cognitive resilience. A brain-supportive lifestyle includes:
- Eating a nutrient-dense, anti-inflammatory diet
- Engaging in regular physical activity
- Maintaining social connections
- Challenging the mind with learning and creative pursuits
- Prioritizing sleep
- Managing stress
- Supporting gut and oral health
- Reducing exposure to environmental toxins
- Monitoring metabolic and hormonal health
These strategies benefit the entire body while lowering many of the known risk factors associated with Alzheimer’s disease.
Reducing risk to support healthy brain function
At Sunrise Functional Medicine, Dr. Tracy Tranchitella takes a comprehensive approach to cognitive wellness. Rather than focusing on one isolated symptom, she evaluates the many factors that influence brain health, including inflammation, cardiovascular risk, blood sugar regulation, hormone balance, nutrient status, and environmental exposures. Advanced laboratory testing can help identify early warning signs and provide objective data to guide treatment and monitor progress over time.
Although there is currently no definitive cure for Alzheimer’s disease, there is much that can be done to reduce risk and support healthy brain function. By addressing the root causes years before symptoms appear, it may be possible to change the trajectory of cognitive decline and improve overall health at the same time.
If you are concerned about memory, cardiovascular health, or inflammation—or simply want to take proactive steps to protect your brain—Dr. Tranchitella offers personalized functional medicine care to help you better understand your risk factors and create a plan for lifelong wellness. Learn more and request a consultation now >>