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Your Gut and Your Brain: Could Your Microbiome Influence Alzheimer's and Parkinson's Disease?

The Hidden Connection Between Gut Health and Brain Health

For many years, Alzheimer's disease and Parkinson's disease were thought to be conditions that originated solely in the brain. Exciting new research is revealing a different story: the health of your gut microbiome may play an important role in the development and progression of these neurological conditions.

Your gut microbiome is made up of trillions of microorganisms that live primarily in your large intestine. These microbes help digest food, produce vitamins, regulate immunity, and even communicate directly with your brain through what scientists call the Gut-Brain Axis.

What is the Gut-Brain Axis?

The gut and brain are in constant communication through:

  • The vagus nerve (a direct connection between the gut and brain)
  • Hormones and neurotransmitters
  • The immune system
  • Microbial compounds produced by gut bacteria

Healthy gut bacteria produce beneficial substances called short-chain fatty acids (SCFAs) from food sources, particularly butyrate, acetate, and propionate. These compounds help:

  • Reduce inflammation

  • Support the intestinal barrier

  • Maintain the blood-brain barrier

  • Support healthy brain function

When the Gut Becomes Unbalanced, often referred to as dysbiosis, meaning a compromised gut lining with an imbalanced microbiome, caused by:Poor diet, Chronic stress, Ageing, Certain medications, Environmental toxins, Lack of exercise, beneficial bacteria decline and inflammatory bacteria increase, which leads to:

  • Reduced production of protective SCFAs

  • Increased intestinal permeability ("leaky gut"/ compromised gut lining)

  • Increased inflammation throughout the body

  • Increased permeability of the blood-brain barrier

  • Greater neuroinflammation within the brain

Researchers now believe this chronic inflammation may contribute to neurodegenerative diseases.

The Microbiome and Alzheimer's Disease (AD)

Alzheimer's disease is characterised by progressive memory loss and cognitive decline. Studies have found that people with Alzheimer's disease often have: Reduced microbial diversity, lower levels of beneficial SCFA-producing bacteria, increased inflammatory bacteria, and an increased intestinal and blood-brain barrier permeability.

As the gut barrier gets damaged, bacterial toxins and inflammatory compounds can enter the bloodstream and potentially reach the brain. This may activate immune cells in the brain and contribute to chronic neuroinflammation, a key feature of Alzheimer's disease.

Research also suggests that dietary patterns that support a healthy microbiome, such as the Mediterranean diet, are associated with a lower risk of developing Alzheimer's disease. It has also been suggested that Alzheimer’s disease starts to develop in your 30’s and is often referred to as type 3 diabetes since diet plays such a big role in the development of AD.

The Microbiome and Parkinson's Disease

Parkinson's disease is best known for symptoms such as tremors, stiffness and slowed movement. Interestingly, digestive symptoms such as constipation often appear years before the neurological symptoms develop.

Researchers have found that people with Parkinson's disease frequently show:

  • Reduced levels of beneficial gut bacteria

  • Lower SCFA production

  • Increased inflammatory microbes

  • Greater intestinal permeability

Some scientists believe abnormal protein accumulation associated with Parkinson's disease may begin in the gut and travel to the brain through the vagus nerve.

While more research is needed, growing evidence suggests that gut dysfunction may not simply be a consequence of Parkinson's disease—it may contribute to its development.

Supporting a Healthy Gut-Brain Axis

Although no diet or supplement can prevent or cure Alzheimer's or Parkinson's disease, supporting a healthy microbiome may help reduce inflammation and support overall brain health.

Practical Strategies

    1. Eat More Fibre: Aim for a wide variety of:Vegetables, Fruit, Legumes, Nuts and seeds, Whole grains.These foods feed beneficial bacteria and encourage SCFA production.

    1. Follow a Mediterranean-Style Diet: Eat often - Olive oil, Fish, Vegetables, Legumes, Nuts, Herbs and spices. This dietary pattern has been associated with better cognitive health.

    1. Exercise Regularly: Regular physical activity has been shown to positively influence the gut microbiome while supporting brain health.

    1. Manage Stress: Chronic stress can negatively affect both the gut and the brain. Implement strategies such as: Mindfulness, Breathing exercises, Spend time in nature, Ensure adequate, quality sleep.

    2. Use Antibiotics Only When Necessary: While antibiotics can be lifesaving, they can significantly disrupt microbial diversity.I can add here that the oversuse of anti-acids may hugely contribute to poor digestive dysfunction that indirectly contributes to systemic inflammation.

The relationship between the gut and the brain is one of the most exciting areas of modern medical research. Emerging evidence suggests that changes in the gut microbiome may contribute to inflammation and processes involved in Alzheimer's disease and Parkinson's disease.

Supporting gut health through nutrition, exercise, stress management and healthy lifestyle choices may be an important part of maintaining long-term brain health.

While scientists are still uncovering the details, one message is becoming increasingly clear:A healthy brain may start with a healthy gut.

It is also true that some people are genetically predisposed to the development of these neurogenerative conditions. I am therefore excited to let you know that DNAlysis has launched a GUT test.This test assesses your genetic variations in some of the key genes involved in GUT inflammation. This test highlights key issues with neurotransmitters (memory, brain fog, and mood disorders), autoimmunity, inflammation, or chronic disease. This may reveal why some of us struggle more with our guts than others.

By determining whether you carry medium to high impact genetic variations in some of the key genes involved in GUT function and assimilation, you can then start to make more personalised choices that will lead to better gene expression.

I am an accredited DNAlysis practitioner that will be able to help you interpret the tests results and assist with making necessary changes to improve your genetic expression and your overall health.

Adapted from: Bicknell B, Liebert A, Borody T, et al. Neurodegenerative and Neurodevelopmental Diseases and the Gut-Brain Axis: The Potential of Therapeutic Targeting of the Microbiome. International Journal of Molecular Sciences. 2023;24(11):9577.