What Causes Alzheimer's Disease - Types 3, 4, & 5
Jul 22, 2024
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In the past we have talked about and broken Alzheimer's down into multiple types. They are:
Type 1
Type 1’s primary characteristic is inflammation.
Type 2
Type 2’s primary characteristics are low levels of nutrients, hormone factors, and/or trophic factors.
Type 1.5
Type 1.5’s primary characteristic is insulin resistance (DIABETES)
Here is the link if you would like to go back and read that: https://alzheimerssurvivor.com/blogs/what-is-an-alzheimers-survivor/what-causes-alzheimers-disease
As we begin this week’s discussion, I want to remind you that Alzheimer’s Disease is not a single symptom. Years of research show that you cannot point to one single trait as the single cause of Alzheimer’s Disease. According to Dr. Dale Bredesen, people with Alzheimer’s Disease suffer from multiple “insults” for 20 - 30 years before developing Alzheimer’s. However, when you research what causes Alzheimer’s disease, most will tell you Alzheimer’s is a disease triggered by old age. Explaining that only people over 65 have Alzheimer’s Disease.
Most people slowly develop Alzheimer’s Disease over 20 – 30 years. While symptoms will become apparent in a person in their 40s & 50s, the disease began when they were 22 – 32. What triggers Alzheimer’s Disease to start to develop at this age? Usually, an unhealthy lifestyle! Such as eating too much junk food, eating fast food, not managing their weight, & developing insulin resistance.
Recently, we broke Alzheimer’s Disease down into 5 different categories. As I said then, I find it easier to differentiate the types and symptoms to address what caused it. Here is a brief recap:
Type 1
Type 1’s primary characteristic is inflammation.
Type 2
Type 2’s primary characteristics are low levels of nutrients, hormone factors, and/or trophic factors.
Type 1.5
Type 1.5’s primary characteristic is insulin resistance (diabetes
Type 3
Type 3’s primary characteristic is exposure to toxins.
Type 4
Type 4’s primary characteristic is low blood flow to the brain.
Type 5
Type 5’s primary characteristic is brain damage.
This week we will review what causes Alzheimer’s Disease in Type 3, Type 4 & Type 5 Alzheimer’s Disease.
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TYPE 3
Type 3’s primary characteristic is exposure to toxins.
What causes toxic Alzheimer’s?
Today toxins are everywhere. There are heavy metals in our food, mold in our houses, toxic substances in our plastic, and pollutants in the air. If you live in the US, toxin exposure is a fact of life. While these toxins certainly are not good for us, our bodies are capable of removing these substances. This is known as detoxification. It becomes a problem when more toxins are entering our bodies than we can remove, or when our body’s detoxification system is unequipped to detoxify a given substance. When this occurs for some people, they begin to develop a subtype of Alzheimer’s disease known as toxic Alzheimer’s. The most common contributors to toxic Alzheimer’s are as follows:
Mycotoxins
Mycotoxins are a class of toxic chemicals secreted from certain types of molds. Some of the most well-documented mycotoxins include aflatoxin, ochratoxin, fumonisin, gliotoxins, and trichothecenes. These toxins are capable of disrupting neurotransmitter synthesis, depleting the body’s antioxidant reserve, impairing the blood brain barrier integrity, and even killing brain cells. Altogether, a heavy burden of mycotoxins can contribute to the onset of toxic Alzheimer's disease.
Heavy Metals
Heavy metals are another source of chemical toxicants that can contribute to Alzheimer’s. The most common neurotoxic chemicals are lead, mercury, and arsenic. While we are still waiting on further research to clarify the role of heavy metals in Alzheimer’s Disease, this is what we know:
- Lead - Lead is a heavy metal that readily passes through the blood brain barrier to cause direct damage to the brain. The result of lead toxicity is neuroinflammation, oxidative stress, and neurodegeneration.
- Mercury - Mercury disrupts the body’s natural antioxidant system and causes an accumulation of reactive oxygen species. These are destructive molecules that damage the DNA and cause all sorts of issues. In the case of Alzheimer's, mercury builds up in the brain and contributes to memory loss and personality changes.
- Arsenic - Arsenic is a heavy metal found in the soil, air, and contaminated water. Arsenic travels through the blood and enters into various organ tissues where it stays. In the brain, arsenic disrupts the metabolism of brain cells called astrocytes. This metabolic disruption causes impairment to the central nervous system.
Other Toxins
There are many other toxins that we are exposed to in our modern world. Many of these are found in plastic products, such as bisphenol-A (BPA). Other sources include herbicides and pesticides used in agriculture.
What are the signs and symptoms of toxic Alzheimer’s?
Toxic Alzheimer’s can be one of the hardest subtypes to diagnose. This is because different toxins affect the brain in different ways. For this reason, it is important to understand all signs and symptoms that may lead to a diagnosis. The following signs and symptoms are as outlined by Dr. Dale Bredesen as a part of the Bredesen Protocol in the book “The End of Alzheimer’s”.
- Symptoms begin before age 65
- Usually ApoE4 negative
- No family history, or family history with symptoms beginning only at ages much older than the patient’s
- Symptoms often occur around the time of menopause or andropause.
- Depression precedes or accompanies cognitive decline
- Headache is an early symptom, and sometimes the first.
- Typical symptoms include executive function deficits (planning, problem solving, organizing, focusing), inability to manipulate numbers/perform calculations, trouble speaking or loss of speech, problems with visual perception, or problems with learned programs such as dressing.
- Increased stress (e.g., loss of employment, divorce, family change) and sleep loss.
- Exposure to mycotoxins or metals (e.g., inorganic mercury via amalgams, or organic mercury via fish) or both
- Diagnosis of CIRS (chronic inflammatory response syndrome) with cognitive decline
- Imaging suggests brain changes not seen in most cases of Alzheimer’s
TYPE 4
Type 4’s primary characteristic is low blood flow to the brain.
Type 4 or Vascular AD, is caused by a reduction of blood flow to the brain, which ultimately deprives the brain of essential oxygen and nutrients. The brain is an extremely vascularized tissue, meaning it requires large amounts of oxygen. A lack of oxygen to the brain leads to hypoperfusion (low blood flow) and compromises the blood-brain barrier which allows for harmful substances to leak in and damage neurons. Cerebral vasculature is extremely important as it is one way the body clears the accumulation of amyloid-beta.
CHARACTERISTICS & BIOCHEMICAL MARKERS OF TYPE 4
- “Leakiness” present in vascular tissues.
- Individuals with cardiovascular disease have a high risk for Type 4 Alzheimer’s.
- These individuals do best when they prioritize healing underlying insulin resistance.
CARDIOVASCULAR HEALTH
Most people think of cardiovascular health, they only think about the heart. However cardiovascular health extends to the entire body, including the brain. Vascular disease typically manifests in the brain as inflammation of the blood vessel lining. This inflammation has a series of negative effects such as activating the immune cells of the brain and reducing overall blood flow. Both of these are known contributors to the progression of Alzheimer’s and can increase the amount of amyloid plaque in the brain. For this reason, there is a large crossover between the presence of cardiovascular disease and vascular Alzheimer’s.
BLOOD BRAIN BARRIER INTEGRITY
The blood brain barrier often breaks down in those with Alzheimer’s disease. The blood brain barrier is the lining of the blood vessels around the brain that gives the brain an extra level of protection from bloodborne pathogens, & toxins. Since the blood brain barrier is so selective with what is and is not allowed to pass through, it can be a big deal when the structural integrity begins to degrade. Things that are not supposed to get into the brain begin to leak in. Nutrients that require an intact blood brain barrier to enter can no longer get in. This is why nutrients like omega-3 tend to be lower in those with blood brain barrier integrity issues. Cardiovascular health appears to play a large role in blood brain barrier breakdown with a positive ApoE4 status being highly correlated with vascular Alzheimer’s.
TYPE 5
Type 5’s primary characteristic is brain damage.
Traumatic brain injuries can contribute to the development of Alzheimer’s disease. While it is different for each person, the consequences of these injuries may extend long after the initial symptoms subside. Traumatic Alzheimer’s is the fifth subtype of Alzheimer’s disease and is characterized by a history of head trauma. Often leading to an earlier onset of Alzheimer’s disease. While not all head injuries lead to Alzheimer’s, traumatic Alzheimer’s symptoms usually do not appear until many years or decades after the traumatic event.
Causes of Traumatic Alzheimer’s
The categorization of traumatic Alzheimer's disease came about after recognizing that the majority of people who suffered a mild to moderate traumatic brain injury during their lives had plaque in their brain upon autopsy, regardless of the cause of death.
Early research is beginning to explain how traumatic Alzheimer’s works, and how we can treat it. It appears that experiencing a traumatic brain injury causes acute stress to the brain and surrounding vasculature. Whether this is a one-time injury from an accident or a repeated trauma from playing sports, the brain becomes inflamed and the integrity of the blood-brain barrier begins to break down. While this reaction may subside in some people, it appears to kick-start the pathology of Alzheimer's disease in others. These are typically people who have an ApoE4 allele or have a predisposition towards inflammatory Alzheimer's disease or vascular Alzheimer's disease. For these people, a traumatic brain injury may expedite the onset of Alzheimer's Disease by years. When this occurs, the condition is classified as traumatic Alzheimer's disease.
SIGNS AND SYMPTOMS OF TRAUMATIC ALZHEIMER’S
Signs and symptoms of traumatic Alzheimer’s will vary heavily from one person to the next. The most obvious sign would be a history of one or more traumatic brain injuries. Other than that, the signs and symptoms would depend on whether the brain injury is vascular or inflammatory.
MISSION
The primary mission of Alzheimer’s Survivor is to communicate to everyone that there are treatments available for people experiencing Alzheimer’s Disease.
- There are Research solutions available for every stage of the disease
- There are FDA-approved pharmaceuticals for every stage of the disease
- There are Integrative Medicine solutions available for every stage of the disease
Gone are the days when there was nothing you could do to treat Alzheimer’s Disease. It is up to each individual and their family to decide what option best fits your need.
Next week, we will begin to discuss treatments that are available to treat Alzheimer’s Disease.
Here are the links to purchase the books on Amazon and the link to Dr. Bredesen’s website.
THE END OF ALZHEIMER’S 2 BOOKS COLLECTION SET BY DALE BREDESEN PAPERBACK – OCTOBER 26, 2023
LINK:
https://amzn.to/462LcY3
The End of Alzheimer's Program: The First Protocol to Enhance Cognition and Reverse Decline at AnyAge Paperback – September 6, 2022
LINK:
https://amzn.to/3xNcrct
Dr. Bredesen’s Website
LINK: https://www.apollohealthco.com/
- To view the original version of this article visit alzheimerssurvivor.com/blogs/what-is-an-alzheimers-survivor/what-causes-alzheimers-disease-types-3-4-5
- Seniors Blue Book was not involved in the creation of this content.
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