Is Your Gut Health About More Than What You Eat?

Why your nervous system and relationships might matter just as much as your diet when it comes to digestion.

I recently had the opportunity to attend a seminar led by Dr. Matthew Lederman, a board certified internal medicine physician best known for his work in nutrition and chronic disease prevention. Going into it, I expected a deep dive into food. I pictured something like a science lecture on digestion, enzymes, and how specific nutrients impact the gut.

But that’s not what I got.

Instead, he challenged something I thought I understood pretty well. He said the food you eat is only a small part of how your body actually digests it.

Naturally... I was confused. How could that possibly make sense? If digestion is about food, then how could food not be the main factor?

He explained it like this: you can eat the “perfect” diet, exercise regularly, and check every wellness box, yet still feel bloated, constipated, and uncomfortable. When that happens, it may not be about what you’re eating at all, but about your gut-brain-heart connection.

I was skeptical at first. But the more he spoke, the more I realized how familiar this sounded. I can’t count the number of times I’ve done everything “right” and still felt off.

A core part of his work focuses on what he calls the gut-brain-heart axis and the role of the nervous system. At its simplest, this means that your nervous system acts as the master regulator of digestion.

When we feel "safe" (and I’ll come back to this term later), our bodies activate the parasympathetic nervous system. This is often called the “rest and digest” state. In this mode, digestion flows more efficiently, nutrients are absorbed more effectively, and the microbiome is supported. The body is in a state that allows healing.

On the other hand, when we’re stressed or in a “threat” state, the sympathetic nervous system takes over. This is the familiar “fight or flight” response. Blood flow shifts away from digestion, bowel movement can slow down, and nutrient absorption may be reduced. Over time, the gut can become disrupted.

This isn’t just a theory. It aligns with what we know about the gut-brain axis, the constant two way communication between our nervous system and our digestive system. Our emotions and our physiology are not separate systems. They’re deeply intertwined.

One word Dr. Lederman kept coming back to was “safety.”

Not physical safety in the obvious sense, but emotional safety. Feeling safe in our relationships, in our environment, and within our own internal experience.

And this is where it got interesting.

Digestion doesn’t just depend on what’s on your plate, but the state you’re in while you’re eating. And that state is heavily influenced by who you’re sitting across from.

Have you ever noticed how different a meal feels depending on who you’re with? Eating alone in a rush feels one way. Eating while tense or mid-conflict feels another. Compare that to sharing a relaxed dinner with someone who makes you feel understood, heard, and at ease.

Same food. Completely different body.

Dr. Lederman explained that when we feel emotionally safe, our physiology shifts into a state that supports repair, restoration, and optimal function. When we’re chronically stressed, disconnected, or in unresolved conflict, our bodies can remain in a subtle threat state that makes digestion harder.

What struck me most was his point that this has little to do with conscious awareness. We can believe we’re relaxed, content, and totally “safe,” yet our nervous system may still perceive threat.

Think about travel. Have you ever been on a beautiful vacation, completely relaxed, yet suddenly constipated? You’re lying by the beach, not a worry in the world, and yet you just can’t go. Or maybe the second you step onto a plane, everything shuts down and decides to stay put. Then you get home, drop your bags, and immediately sprint to the bathroom.

According to this framework, your mind might feel calm, but your body is processing a new environment. Different sounds, different smells, different routines, different beds. All of these subtle inputs can register as stress to the nervous system. Your body feels slightly on guard, even if you don’t consciously feel anxious.

Obviously, a million questions start popping up in my head. If emotional safety is mostly subconscious and our nervous system is scanning for threat without us even realizing it, then what does that mean? Are we just at the mercy of it? If my body decides something is stressful, even when I feel fine, am I just stuck there?

To answer this question, Dr. Lederman proposes building what he calls “safety nutrients” in everyday life. These are emotional, relational, and psychological experiences that signal safety to the nervous system, like empathy, connection, acknowledgement, autonomy, and consistency. When these elements are present regularly in our relationships and interactions, they provide emotional security that helps shift the nervous system toward a calm, parasympathetic state rather than a chronic threat response.

He’s also a big proponent of practicing authentic human connection. I know that can sound a little vague or fluffy, but stay with me. In everyday conversations, we’re often quick to interpret tone as criticism, silence as rejection, or disagreement as an attack. Our nervous systems react before we ever pause to get curious about what’s actually happening.

Dr. Lederman suggests a simple but powerful shift: intentionally assume positive intent. When we do that, something softens internally. We stop bracing, we listen a little more openly, and that shift is not just emotional, it’s physiological. Instead of signaling danger, we signal safety. We move out of protection mode and a little closer to the state where our bodies can finally rest and digest.

So what does this actually mean for us, practically?

It doesn’t mean food stops mattering; nutrition is still foundational. But what this seminar made me realize is that we can’t out-supplement or out-salad a nervous system that feels constantly on edge.

Gut health isn’t just about what's on your plate, but about how fast you’re eating, who you’re eating with, what conversation is happening at the table, and what stress you’re carrying into the meal.

For me, this talk expanded my definition of “working on my gut health.” I used to think all I needed was a strong probiotic and some sauerkraut (still my favorite), but it seems to be more about connecting with the right people and shifting mindsets around those connections.

Improving digestion isn’t just about chasing the perfect diet, but about having an open mind and being authentic in relationships where your body finally feels safe enough to trust Something Better. And maybe that starts long before your next meal.