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Have you ever had a “gut feeling”? That’s not just a figure of speech. In fact, the connection between your digestive system and your brain is one of the most powerful—and most overlooked—relationships in your entire body.

In my functional medicine practice in Woodbury, MN, many patients come to see me for symptoms like anxiety, depression, brain fog, fatigue, and chronic stress. What surprises them most is learning that these symptoms often begin in the gut.

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Your Microbiome: The Hidden Organ Influencing Your Brain

Inside your digestive tract live nearly 100 trillion bacteria, collectively known as your microbiome. These microorganisms are not just passive residents—they actively influence:

• Immune function
• Inflammation levels
• Hormone balance
• Nutrient absorption
• And importantly… brain chemistry and mental health

Harvard Medical School explains that the gut and brain communicate constantly through what’s called the gut–brain axis:
https://www.health.harvard.edu/diseases-and-conditions/the-gut-brain-connection

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Your Gut Health Begins at Birth

The development of your microbiome begins the moment you are born.

Babies are initially colonized by beneficial bacteria through:

• Skin-to-skin contact
• Breastfeeding
• Exposure to the environment

Breastmilk naturally contains important probiotic strains such as lactobacillus and bifidobacteria, as well as prebiotics (the food that feeds good bacteria).

From that point forward, your microbiome continues evolving throughout your life and is influenced by:

• Diet
• Stress
• Medications (especially antibiotics)
• Environment
• Hormones
• Sleep patterns
• Geography
• Lifestyle habits

This means your gut health is not fixed—it is highly adaptable and responsive to change.

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How Stress Affects the Gut–Brain Axis

When you experience chronic stress, anxiety, or depression, a system called the HPA axis (hypothalamic–pituitary–adrenal axis) becomes dysregulated. This system controls your stress hormones, including cortisol.

Research shows that the microbiome directly influences the HPA axis, meaning gut imbalance can increase stress reactivity—and chronic stress can further damage the gut.

NIH overview on gut–brain–stress relationship:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7213601/

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Leaky Gut, Inflammation, and Mental Health

Chronic stress and poor gut health can lead to increased intestinal permeability, commonly known as “leaky gut.”

When this happens:

• Bacteria and toxins can enter the bloodstream
• The immune system becomes activated
• Inflammation increases throughout the body
• The brain becomes exposed to inflammatory chemicals

This neuroinflammation has been associated with:

• Anxiety
• Depression
• Brain fog
• Fatigue
• Memory problems

Cleveland Clinic on leaky gut and systemic effects:
https://health.clevelandclinic.org/leaky-gut-syndrome/

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Can Probiotics Support Mental Health?

The good news is that the gut—and the brain—respond very well to natural interventions.

Research has shown that certain probiotic strains may help regulate the stress response and support emotional balance. Some strains that have demonstrated benefit include:

• Lactobacillus rhamnosus
• Bifidobacterium infantis
• Bifidobacterium longum
• Lactobacillus casei

Johns Hopkins overview on probiotics and mental health:
https://www.hopkinsmedicine.org/health/wellness-and-prevention/the-brain-gut-connection

These strains may help:

• Reduce anxiety symptoms
• Support mood regulation
• Improve stress tolerance
• Support healthy gut barrier function

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Diet Diversity: One of the Most Powerful Gut-Healing Tools

One of the most effective ways to improve your microbiome is surprisingly simple:

👉 Eat a wide variety of vegetables

When you eat the same foods every day, you feed the same bacteria. But when you introduce new vegetables, herbs, and plant fibers, you support greater bacterial diversity, which is strongly linked to better:

• Immune health
• Mental health
• Metabolic health
• Digestive health

Think color, variety, and rotation.

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Omega-3 Fatty Acids and Gut Integrity

Omega-3 fatty acids (from fish oil, salmon, sardines, walnuts, etc.) have been shown to:

• Improve gut barrier integrity
• Support anti-inflammatory pathways
• Positively influence microbiome composition

NIH overview on omega-3 and gut health:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7352513/

This makes omega-3s an excellent foundational nutrient for both gut and brain support.

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Mental Health May Begin in the Gut

Your microbiome is shaped by:

• Your early-life exposures
• Your stress levels
• Your diet
• Your medication history
• Your lifestyle

If you are struggling with mood changes, anxiety, depression, or cognitive symptoms, the root cause may not be solely neurological—it may be gastrointestinal and inflammatory in nature.

This is why functional medicine focuses on whole-body systems, not isolated symptoms.

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Functional Medicine Support in Woodbury, MN

At Functional Health Unlimited, I help patients across Woodbury, Minneapolis, St. Paul, and surrounding Minnesota communities address gut–brain imbalances using:

• Comprehensive history and root-cause evaluation
• Gut and microbiome testing
• Inflammation markers
• Food sensitivity assessment
• Personalized nutrition strategies
• Targeted supplementation
• Stress and lifestyle support

👉 Learn more about our functional medicine approach:
https://www.functionalhealthunlimited.com

👉 Schedule a complimentary consultation:

Request Appointment

Sometimes, the path to clearer thinking, better mood, and improved emotional resilience begins in an unexpected place—your gut.

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Dr. Lori Jokinen, DC, CACCP, CFMP, BA
Functional Medicine & Chiropractic Care
Functional Health Unlimited – Woodbury, Minnesota