top of page
Search

Your Gut Is Talking to You (And It's Not Just About Food): The Gut-Brain Connection and Mental Health

You know that “gut feeling” you get?


That fluttery nervousness before a big conversation. The knots in your stomach when something feels off. The ache in your belly when grief sits heavy in your chest.


That’s not just poetic language. That’s your second brain talking.


Literally.


Wait—second brain?


Yep. Your gut has its own nervous system, known as the enteric nervous system (ENS). It contains over 100 million neurons, more than your spinal cord. It doesn’t “think” the way your brain does, but it feels, remembers, and communicates. It talks to your brain constantly—through a superhighway of nerves, chemicals, and hormones known as the gut-brain axis.


So when your gut is off, your mood often is, too.


And when you’ve lived through trauma, especially early in life, that communication system can become even more sensitive. Many of my clients navigating CPTSD, anxiety, ADHD, and depression notice that their digestion and mental health seem to spiral in tandem.


That’s not in your head—it’s science.


A person sitting on a bed in white, both hands pressed to their stomach in discomfort, soft daylight from a window behind them. The physical ache of a stressed or unsettled gut, and the close link between digestion and how we feel.

The gut-brain connection: A two-way street


Here's what researchers know:


  • Around 90% of your body's serotonin is produced in your gut. Most of it works locally, on digestion, rather than crossing into your brain. But it's a sign of how chemically active the gut really is.

  • The gut microbiome (trillions of bacteria, fungi, and viruses living in your intestines) helps produce and regulate neurotransmitters like GABA and dopamine.

  • These microbes influence not just digestion, but also stress response, immune function, and sleep quality.

  • Inflammation in the gut has been linked to symptoms of depression and anxiety (Carabotti et al., 2015; Foster & McVey Neufeld, 2013).


The gut-brain connection runs through several channels: the vagus nerve, immune signaling, and the chemical byproducts your microbes make. So when your gut is inflamed, imbalanced, or overwhelmed, it can affect your mental clarity, emotional stability, and energy levels.


A paper cutout of human intestines on a blue background, with a magnifying glass over a small protective shield icon and googly-eyed toy "germs" scattered around. A playful illustration of the gut microbiome and the balance of good and harmful bacteria.

What hurts the gut (and our mood)?


Let’s keep it real. Most of us are just trying to survive in a world that often feels like too much. But some everyday habits—especially in times of stress—can make gut health worse:

  • Ultra-processed foods: Think sugary cereals, frozen pizza, fast food, and most snack aisle treats. They now make up more than half of the average American's daily calories (Juul et al., 2022), and diets high in them are associated with more inflammation and less microbial diversity.

  • Alcohol and substances: Alcohol damages the gut lining, disrupts the microbiome, and spikes inflammation (Leclercq et al., 2014).

  • Chronic stress: Long-term stress reduces gut diversity and increases "leaky gut" risk, which can trigger immune issues and anxiety (Konturek et al., 2011)..

  • Sleep deprivation: Even a couple of nights of short sleep can shift the balance of your gut bacteria (Benedict et al., 2016), and poor sleep disrupts the daily rhythms that keep mood and digestion steady.

  • Dehydration: Even mild dehydration slows digestion and can cause headaches, fatigue, and mood swings.

Lack of movement: Gentle movement helps regulate bowel function, lymph flow, and nervous system calm. Sedentary living slows everything down.



What supports the gut (and your whole self)?


Healing the gut isn’t about perfection. It’s about nurturing your body like it’s an ally—not a project.

Here are foundational practices:

Eat whole, diverse foods


  • Focus on fiber-rich fruits and vegetables (bananas, berries, leafy greens, apples, sweet potatoes).

  • Include fermented foods like plain yogurt, kimchi, sauerkraut, kefir, and tempeh (if tolerated).

  • Prioritize prebiotic foods: garlic, onions, oats, asparagus, leeks, and legumes. These feed the good bacteria.

  • Get healthy fats: avocado, nuts, olive oil, fatty fish. These reduce inflammation and help with brain function.

Limit foods with ingredients you can’t pronounce.


Support your microbiome with pre-, pro-, and postbiotics


  • Prebiotics: Think of these as fertilizer for good bacteria (fiber-rich plant foods).

  • Probiotics: These are live bacteria found in fermented foods or supplements. They help repopulate your gut.

  • Postbiotics: The compounds bacteria produce when they digest prebiotics. These include short-chain fatty acids that reduce inflammation and support brain health.

Supplements can help, but food sources are more bioavailable. Always check with a licensed healthcare provider if you’re immunocompromised or on medication.

Stay hydrated

Your gut needs water to digest, absorb nutrients, and flush toxins. Aim for half your body weight in ounces daily (more if you’re active or it’s hot out).

Prioritize deep, restful sleep

Sleep is when your gut regenerates and your brain consolidates emotional experiences. Quality sleep reduces inflammation and improves gut microbial diversity.

Move your body

Regular movement—even gentle walks—improves digestion, reduces cortisol, and stimulates endorphins. You don’t have to hit the gym to benefit.


An overhead spread of whole, gut-supporting foods on a dark background: leafy greens, beans, nuts, berries, avocado, ginger, turmeric, and fresh vegetables. The kind of fiber-rich, diverse, whole-food eating that helps a healthy microbiome.

Food for your mood: Nutrition for mental health


There’s no one-size-fits-all diet for mental health, but here are a few science-backed insights:

  • Anxiety & panic: Magnesium-rich foods like spinach, pumpkin seeds, and dark chocolate may reduce symptoms. Omega-3 fats (like in salmon or chia seeds) support calm.

  • Depression: Complex carbs (like quinoa, lentils, oats) stabilize blood sugar and mood. Dietary improvement — including more whole foods, vegetables, and fish — has been shown to reduce depressive symptoms in adults with major depression (Jacka et al., 2017).

  • ADHD: Protein-rich breakfasts and omega-3s can improve focus and energy. Avoid artificial dyes and excess sugar if sensitive.

  • Trauma & CPTSD: Steady blood sugar is key. Include protein, fiber, and healthy fats with each meal to help ground your nervous system.

If you’ve experienced disordered eating or food insecurity, know that healing your gut can be a slow, gentle process. There’s no shame in small steps.


A note on trauma, food, and body trust


If you grew up in chaos, food might have been the only thing you could control, or not control at all. Some people cope with trauma by restricting, binging, numbing out, or disconnecting from hunger signals. Others feel stuck in fight-or-flight, making digestion nearly impossible.


There's nothing wrong with you. Your body adapted. And it's never too late to reconnect with it. Trauma-informed therapy can help you rebuild that trust, gently and without shame.

Final thoughts: Listening to your gut is an act of healing


You deserve to feel good in your body. Not just "not sick"—but safe, stable, and at home inside yourself.

A close-up of a person cupping a hand behind their ear to listen, against a pale background. Tuning in and paying attention, the way the post invites you to listen to what your gut is telling you.

Start by tuning in. What foods help you feel steady? What rhythms support your sleep? What movement brings you joy?

Your gut is always talking.


Healing begins when we listen.

If you need support…


I work with people in Oregon and Florida on trauma, CPTSD, chronic stress, and the long tail of childhood trauma. If your gut and your mood have been spiraling together and you want help untangling it, that's the kind of thing we can work on.

Griffin Oakley, MSCP, NCC, LMHC, LPC Founder & Therapist, Curious Mind Counseling


About the Author


Griffin is a licensed telehealth therapist and the founder of Curious Mind Counseling, serving clients throughout Oregon and Florida. His work focuses on complex trauma, attachment, and identity, with anxiety and stress often part of the picture.References


References


Benedict, C., Vogel, H., Jonas, W., Woting, A., Blaut, M., Schürmann, A., & Cedernaes, J. (2016). Gut microbiota and glucometabolic alterations in response to recurrent partial sleep deprivation in normal-weight young individuals. Molecular Metabolism, 5(12), 1175–1186. https://doi.org/10.1016/j.molmet.2016.10.003


Carabotti, M., Scirocco, A., Maselli, M. A., & Severi, C. (2015). The gut-brain axis: Interactions between enteric microbiota, central and enteric nervous systems. Annals of Gastroenterology, 28(2), 203–209.


Foster, J. A., & McVey Neufeld, K. A. (2013). Gut–brain axis: How the microbiome influences anxiety and depression. Trends in Neurosciences, 36(5), 305–312. https://doi.org/10.1016/j.tins.2013.01.005


Jacka, F. N., O'Neil, A., Opie, R., Itsiopoulos, C., Cotton, S., Mohebbi, M., Castle, D., Dash, S., Mihalopoulos, C., Chatterton, M. L., Brazionis, L., Dean, O. M., Hodge, A. M., & Berk, M. (2017). A randomised controlled trial of dietary improvement for adults with major depression (the 'SMILES' trial). BMC Medicine, 15, 23. https://doi.org/10.1186/s12916-017-0791-y


Juul, F., Parekh, N., Martinez-Steele, E., Monteiro, C. A., & Chang, V. W. (2022). Ultra-processed food consumption among US adults from 2001 to 2018. American Journal of Clinical Nutrition, 115(1), 211–221. https://doi.org/10.1093/ajcn/nqab305


Konturek, P. C., Brzozowski, T., & Konturek, S. J. (2011). Stress and the gut: Pathophysiology, clinical consequences, diagnostic approach and treatment options. Journal of Physiology and Pharmacology, 62(6), 591–599.


Leclercq, S., Matamoros, S., Cani, P. D., Neyrinck, A. M., Jamar, F., Stärkel, P., Windey, K., Tremaroli, V., Bäckhed, F., Verbeke, K., de Timary, P., & Delzenne, N. M. (2014). Intestinal permeability, gut-bacterial dysbiosis, and behavioral markers of alcohol-dependence severity. Proceedings of the National Academy of Sciences, 111(42), E4485–E4493. https://doi.org/10.1073/pnas.1415174111


 
 
bottom of page