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About
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- Personal Training
- Performance Coaching
HI Health Professionals
blog
resource library

Your gut and brain are talking (and it explains a lot)

woman with messy hair wearing black crew-neck t-shirt holding spoon with cereals on top

January 22, 2026
Diet, Inflammation, Mood, Sleep, Stress

If you’ve ever felt “butterflies” in your stomach before a stressful moment, or noticed that stress messes with your digestion, you’ve already experienced the gut–brain connection. For a long time, these experiences were brushed off as coincidence or metaphor. They aren’t.

Over the past decade, research on what’s called the microbiota–gut–brain axis has expanded rapidly. Scientists are now mapping how the brain and the gut communicate in both directions and how the microbes living in the gut fit into that conversation.

What the research says

A 2022 systematic review pulled together findings from many years of research to better understand how gut microbes interact with the brain across the lifespan, from early development through adulthood.

The brain influences the gut through stress hormones, nerve signaling, and changes in digestion and motility. At the same time, the gut and the microbes living there send signals back to the brain through immune messengers, metabolic byproducts, and the vagus nerve (a major communication pathway that carries signals between the gut and the brain). This means the relationship is not one-way. The gut doesn’t just respond to the brain. It participates.

The microbes themselves matter because they are metabolically active. They help break down food, produce short-chain fatty acids, influence inflammation, and interact with neurotransmitter systems involved in mood and stress regulation. Some microbes are associated with anti-inflammatory effects, while others are linked with higher inflammatory activity.

That said, this is where nuance matters

Most of the evidence so far shows correlations (i.e., a link between the two), not simple cause-and-effect. Researchers can observe that certain microbial patterns are more common in people experiencing chronic stress or mood disorders, but that doesn’t mean one specific microbe “causes” anxiety or depression. Human biology is more complex than that.

The 2022 review also highlights that context plays a big role. Diet, early life experiences, chronic stress, sleep, medications, and overall health all influence the gut microbiome. This helps explain why two people can eat similarly but feel very different mentally and physically.

Another important point is timing

Early development appears to be a particularly sensitive window, but gut–brain communication continues throughout life. Stress in adulthood can still alter gut function and microbial balance, which can then feed back into mood and stress responses. This creates a loop rather than a straight line.

The bottom line is that the gut and brain are deeply connected through multiple biological pathways. Your mental state can influence your digestion and gut environment, and your gut health can influence how your brain responds to stress.

What can you do with this information?

It can be reassuring. Mood changes, stress sensitivity, and digestive symptoms are not separate problems happening in isolation. They are often part of the same system responding to load.

This research reminds us that supporting mental well-being isn’t only about the brain, and supporting gut health isn’t only about digestion. Both are part of the same conversation happening inside the body.

As research continues, scientists are becoming more precise about how this system works and why responses differ. What hasn’t changed is the core finding: the gut and brain are in constant communication, and understanding that connection can help make sense of experiences many people already recognize in their own bodies.

Stop treating your symptoms like separate parts

For years, we’ve been taught to manage our health in isolation. We treat brain fog with caffeine, stress with willpower, and bloating with a random diet tip. But as the data shows, your gut and your brain are locked in a constant, real-time conversation. When your system is under heavy professional load, a leak in one pillar will instantly trigger a crisis in another. It’s time to stop guessing and look at the full, integrated system.

Take The Performance Audit to map your unique baseline, locate the exact points of biological friction, and see how your routines are actually working together right now. [CLICK HERE TO ACCESS THE PERFORMANCE AUDIT]

References

The microbiota-gut-brain axis and neurodevelopmental disorders. Protein Cell. 2023 Oct. This article is based on a comprehensive 2022 review published in Nature Reviews Neuroscience that examined how gut microbes communicate with the brain across the lifespan. The review synthesizes findings from human, animal, and mechanistic studies to explain how the gut, brain, and immune system interact through neural, immune, and metabolic pathways. Read article here.

This article was originally published inside The Executive Health Brief – a private weekly brief containing curated insights on sustaining high-level performance for leaders, visionaries, big dreamers, and change-makers. Join the brief to get ahead of the risk before it becomes a crisis.

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About Sharon Aldeguer
Sharon is the Total Body Strategist. She works with high-performers to build custom systems for their movement, nutrition, and mental focus. Her goal is simple: give you a highly reliable body that looks and feels powerful, handles heavy cognitive days, and projects the exact kind of confident, magnetic presence your role demands. To work with her, apply for an Executive Performance Audit today!

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