Summary
Your brain and gut are constantly talking to one another, and what your brain is experiencing can influence what’s happening in your digestive system.
Have you noticed that when you’re nervous, you feel it in your stomach? Maybe you’re about to step up to a podium or answer a dreaded phone call when all of a sudden you get “butterflies,” nausea, or a sudden need to go to the bathroom.
That’s not a coincidence, and it’s not “all in your head.” There’s a very real, very strong connection between your brain and your gut, and choices that affect one affect the other. So while your food choices do play a major role in your digestive health, your nervous system and stress levels influence digestion in ways that might surprise you.
Understanding this connection is the first step toward creating the right conditions for your body to break down your meals, absorb the nutrients, and turn your food into fuel. This gets scientific, so let’s take a lesson from digestion and break it down one bit at a time.
What Is the Gut-Brain Connection?
When you think back to the posters you might have seen in high school biology class, it’s no wonder many people think of the digestive system as just one simple collection of organs working one after another to break down food. But your digestive system doesn’t operate in isolation; it’s in constant two-way communication with your brain.
This continual communication is known as the gut-brain connection, also referred to in the scientific community as the gut-brain axis. It connects the central nervous system (brain and spinal cord) with the enteric nervous system, which is the network of nerves in your digestive tract. Your brain influences what happens in your gut, and your gut sends signals right back to your brain through different pathways such as nerves, hormones, and immune messengers.
Brain to Gut
Your brain and gut are constantly talking to one another, and what your brain is experiencing can influence what’s happening in your digestive system. This two-way communication uses both nerves and chemical signals, with the vagus nerve at the heart of the network.
This long nerve pathway connects the brainstem with much of the digestive tract and helps carry information both ways, allowing the brain to influence different digestive functions and gut movement.
Your brain can also influence your gut by releasing chemical messengers such as stress hormones that can change how your digestive system functions.
Gut to Brain
While your brain is communicating with your gut, your gut is constantly sending information back to your brain, too. The enteric nervous system (ENS) is a network of over 100 million cells that line the walls of your digestive tract. Because it can coordinate and regulate so many digestive functions independently, it’s often called the “second brain.”
Nerves in your digestive tract are always monitoring what’s happening in your gut and sending this information back to the central nervous system. This tells your brain what’s happening in your gut, like how full your stomach is and how efficiently food is moving through your digestive tract.
And when irritation or inflammation is present in your gut, your ENS sends stress signals up to your brain. That’s one reason why digestive problems can affect your mood, and why the relationship between stress and digestive systems is a two-way street. Stress can influence your gut, but what’s happening in your gut can also influence your brain’s stress response.
More on the Vagus Nerve: Your Gut-Brain Superhighway
The vagus nerve is the main information pathway linking your brain and many of the organs throughout your body. Its name comes from the Latin word for “wandering,” which fits because this nerve starts at the brainstem and travels down the neck, chest, and abdomen, where it connects with much of the digestive system.
The vagus nerve connects the brain, the heart, and the gut. It’s a major component of the parasympathetic nervous system, which helps regulate involuntary functions such as breathing, heart rate, and digestion. It manages your body’s “rest and digest” state by lowering your heart rate, boosting digestion, and slowing your breathing, all of which serve to calm your body.
What Happens to Digestion When You’re Stressed?
It may not always seem helpful, but your stress response is designed to protect you.
Your vagus nerve is always receiving and sending information. Think of it as an antenna that’s constantly listening for signals about what’s happening in your environment, scanning for anything that indicates either safety or danger to help your brain and body respond the right way. During a peaceful moment, this helps your brain quiets your threat detection systems and activates relaxation pathways, lowering your heart rate and reducing stress hormones.
But when your brain perceives a threat, whether that looks like immediate danger or a message that says, “We need to talk,” it activates your body’s stress response. Stress hormones, like cortisol, prepare your body to respond to that perceived threat, and your nervous system shifts toward its sympathetic state. This is the fight-or-flight response.
How is this helpful? Imagine our prehistoric ancestors coming face to face with a saber-toothed tiger. Their bodies needed to respond immediately, with available energy routed to functions that would help them fight or escape. Heart rate would increase, breathing would speed up, blood flow would be redirected to the muscles, and digestion would take the backseat. After the danger passes, the body could shift back to a parasympathetic state, and digestion would once again be a priority.
We may not be running from saber-toothed tigers anymore, but our nervous systems today have to respond to many different forms of stress. Looming deadlines, hard conversations, financial worries, family concerns, or even just the constant stream of headlines and notifications can activate your body’s stress response, even if you’re physically safe.
How does this influence digestion?
- Slower Digestion: When you’re stressed, your nervous system shifts energy away from “non-essential” tasks, like digestion, to deal with the perceived threat.
- Stress Hormones: Cortisol and adrenaline can alter muscle contractions in the digestive tract, which slows stomach emptying.
- Bowel Changes: While parts of the digestive tract slow down, stress can also speed up activity in the large intestine, which can cause cramps or diarrhea.
- Acid Reflux: Stress can trigger or worsen acid reflux through changes in digestion and gut sensitivity.
That’s why you might experience that “nervous stomach” before a big presentation or completely lose your appetite when you’re nervous about something. You’re not imagining these feelings; your nervous system is actually influencing how your gut functions.
The Microbiome and the Gut-Brain Connection
There’s another important participant in the gut-brain conversation: your microbiome.
Your gut microbiome is the massive community of microorganisms that live throughout your digestive tract, including bacteria, fungi, and other microbes. In his book Grain Brain, Dr. David Perlmutter says, “Amazingly, a full 99 percent of the genetic material is housed by your microbiome! It supports and nurtures every aspect of your physiology, including what goes on in the brain.”
This means your gut microbes are doing much more than helping you digest food; they create another line of communication between your gut and your brain. One way is by producing short-chain fatty acids (SCFAs) when they break down certain types of fiber, which play important roles in gut health and influence inflammation. They also interact with your hypothalamic-pituitary-adrenal (HPA) axis, which helps coordinate your body’s hormonal response to stress.
Signals travel between your brain and your microbiome through several pathways, including the vagus nerve. And remember, this is a two-way conversation. Your gut microbes influence signals traveling toward your brain, and chronic stress from your brain can impair your gut microbiome.
This is why the importance of gut health goes beyond digestion. Your gut microbiome is one piece of an entire system that connects your digestive tract, your nervous system, and your brain. Taking care of your gut supports your whole self.
Support Digestion Through the Gut-Brain Connection
Your brain influences your gut, and your gut influences your brain, so supporting your nervous system is a necessary part of supporting healthy digestion. Eliminating every source of stress from your life can’t be the goal, however. That would be impossible, but you can look for regular, everyday opportunities to help regulate your nervous system to keep your body in that “rest and digest” state as much as possible.
Prioritize Sleep
Lack of sleep disrupts your nervous system, impairing your emotional regulation and physical stress response. Stress and sleep create a feedback loop. Poor sleep can make you feel stressed, stress can interfere with sleep, and the vicious cycle continues.
Before getting into bed, do some breathing exercises and take a detox bath to ease your mind after a chaotic day. Avoid eating late at night to reduce reflux symptoms that can keep you awake, and finally, give your body a dose of Acid-Kicking Minerals thirty minutes before you go to sleep. These alkaline minerals are very calming to the nervous system and promote deep, restful sleep.
Move Your Body
Motion is life, but our modern lifestyles have the average person sitting more than ever. American adults are sedentary for more than three-fifths of their waking hours, and the majority don’t get the recommended amount of exercise each week.
Physical activity triggers the release of “feel-good” brain chemicals like endorphins, dopamine, and serotonin. So when you’re feeling stressed, movement can boost your mood and bring you to a calmer state. Even something as simple as a walk around the neighborhood can lift some of the weight off your shoulders, and you’ll feel a difference in your entire body.
Nourish Your Microbiome
An unhealthy or leaky gut allows stress hormones to enter the bloodstream, which triggers inflammation that can impact mental health. Supporting the gut lining helps calm these inflammatory responses, so it’s important to eat a diverse, whole-food diet rich in fiber and prebiotics.
A simple step you can take right away to strengthen your gut is adding a daily dose of Gut Punch to your wellness routine. This blend of organic collagen peptides, dairy-free colostrum, and IgG binds and removes gut irritants to support digestion, nutrient absorption, and a calmer gut.
Meditation
Taking a few minutes to reset your nervous system through meditation and breathwork lowers existing stress levels and changes the way your body responds to new stressors. If you’re not sure where to start, try this simple calming meditation:
- Close your eyes and place your hands on your belly.
- Tune into the sensations around you as you slowly inhale and exhale.
- Gradually begin to deepen your breaths as you take ten to twenty slow, conscious breaths.
Repeat this a few times every day, and you’ll start to notice it becoming more natural. To help you stay consistent, try setting reminders on your phone or downloading a meditation app.
The Gut-Brain Connection and Stress
Stress is created not by external factors, but by the way we perceive situations in life. Manage stress by doing more of what nourishes your mind and body, and support your nervous system from the inside out by focusing on maintaining a balanced, healthy gut.
Stress is something that will always be a part of life, one way or another. There will be seasons of less and seasons of more. We want to minimize stress as much as possible, but there are times when stress is unavoidable. Just remember this: being healthy doesn’t depend on how much stress you have, but how you adapt to stress. Focus on keeping your brain and body in peak state so that when a stressful situation arises, you’ll be ready.
