The Gut-Brain Connection: How Poop Affects Your Mood

In recent years, as more and more people have become interested in maintaining a healthy gut microbiome, there has been a growing interest in the complex relationship between the gut and the brain. This connection is often referred to as the gut-brain axis, and it reveals how our digestive system plays an important role in regulating our mood and overall health. While the concept may seem surprising, the state of our gut, including the frequency and quality of our bowel movements (healthy stools), can directly affect our mood and mental clarity.

This article explains the science behind this connection, how our microbiome and gut activity affect our mood, and tips for maintaining a healthy balance.

The enteric nervous system (ENS)

At the heart of the gut-brain connection is the enteric nervous system (ENS), often referred to as the “little brain” of the gut. The ENS consists of two thin layers, each with more than 100 million nerve cells, that line the gastrointestinal (GI) tract, extending from the esophagus to the rectum. Unlike the central nervous system (CNS), which controls most of our conscious thought processes, the ENS is primarily responsible for digestion. It regulates everything from producing stomach acid needed to break down food to excreting waste. It also plays a crucial role in the interaction between the gut and immune systems.

While IBS is primarily concerned with maintaining digestive function, it can also directly affect our moods. Research shows that people with gastrointestinal issues like irritable bowel syndrome (IBS), constipation, or bloating often experience negative emotions. That’s because IBS communicates with the central nervous system, sending distress signals that can manifest as anxiety, depression, and other mood disorders. Some gastroenterologists may prescribe antidepressants to IBS patients, which target nerve cells in the gut to ease digestive and mood symptoms. “Your stress or emotions can definitely affect your gut, and the physical sensations of your gut can also affect your mood,” says Amanda Sauceda, MS, RD, registered dietitian and founder of The Mindful Gut. Since the vagus nerve is the main link between IBS and the gut, Sauceda says it can “transmit messages from the brain to the gut and vice versa.” “In fact,” she adds, “messages from the gut/body go to the brain more.”

The impact of the microbiome on mood

Our guts are made up of trillions of bacteria, known as the microbiome, which play a key role not only in our digestive processes, but also in our emotional health. The composition of our gut microbiome significantly influences a variety of emotional issues, including mood, anxiety, fatigue, depression, and irritability, and when the microbiome is out of balance, it can lead to a variety of these issues. This is yet another reason why a healthy bowel movement is so important!

A key aspect of this connection lies in the production of serotonin, a neurotransmitter that regulates mood and social behavior. Surprisingly, the majority of serotonin is produced in the gut. Therefore, the health of our microbiome directly affects our serotonin levels, and in turn, our mental health. Maintaining a balanced gut microbiome is therefore essential for maintaining positive mood and preventing the onset of mental health disorders.

Chronic constipation

Chronic constipation, characterized by hard, dry stools and infrequent bowel movements, can be a serious threat to your physical and mental health. When your body has trouble expelling waste, it begins to reabsorb toxins, which can have a range of negative effects on your mental health. Developing a habit of regular bowel movements is essential to clearing your colon of undigested food, existing waste, and harmful bacteria.

Constipation can be very uncomfortable, causing bloating, abdominal pain, cramping and nausea. These symptoms can disrupt your sleep, sapping your energy throughout the day and even get in the way of your social life, making it difficult to focus on work or maintain healthy relationships. Over time, the emotional impact of chronic constipation can exacerbate feelings of irritability, depression and anxiety, creating a continuing cycle of digestive and mental health issues.

While using a stool softener or laxative can provide short-term relief in addition to improving your mood, Sauceda advises using them with caution. “I would not recommend using a stool softener and/or laxative every day. Relying on a stool softener or laxative to keep your bowel movements regular can cause problems. This problem is exacerbated if laxatives are used too frequently because your bowel becomes dependent on them.”

Finding a healthy and happy balance

Frequent bowel movements or infrequent bowel movements can significantly affect mood. When food and nutrients move through the body too quickly, the body may not absorb the essential nutrients it needs, leading to nutritional deficiencies that can cause depression, anxiety, irritability, and cognitive impairment. On the other hand, constipation often leads to persistent discomfort, bloating, and stomach pain, which can further exacerbate negative emotions.

Interestingly, regular, satisfying bowel movements can induce a feeling of well-being. This feeling occurs when the parasympathetic nervous system is activated, which releases a calming effect throughout the body and triggers the vagus nerve, which connects the brain to the colon. As a result, your blood pressure and heart rate decrease, creating a feeling of relaxation and well-being.

Solutions for regular bowel movements, healthy bowel movements, and emotional balance

To maintain regular bowel movements and promote a healthy, balanced mood, try incorporating these tips into your daily routine:

diet

Following a nutrient-dense diet is essential for a healthy and happy gut-brain connection. Try to eat more gut-healthy foods, such as fermented products (which provide healthy bacteria to the gut) and high-fiber foods (which soften stool and promote regular bowel movements). Sauceda also recommends adding more colorful plants to your plate, saying, “The more color you have, the more variety you have on your plate and in your diet. The more color you have, the easier it is to communicate the various nutrients and antioxidants.”

exercise

Regular physical activity is a great way to stimulate the digestive process. Exercise activates the parasympathetic nervous system, which in turn stimulates the vagus nerve. This activation promotes relaxation, lowers blood pressure, enhances digestion, and promotes bowel regularity. Additionally, physical activity helps balance the microbiome, which is essential for the production of serotonin in the gut.

Mindful Self-Care

Self-care has benefits for both the mind and body. Taking time for self-care and using techniques like yoga and meditation can be very relaxing and reduce stress and anxiety. Various yoga poses can help massage the digestive tract and encourage stool to pass out of the body.

Seek professional help

If these methods don’t provide relief or return to normal, you may need to consult a doctor or gastroenterologist. They can suggest other treatments, prescribe medications, and run tests if a more serious problem is suspected.

Summarize

Understanding the gut-brain relationship can reveal just how important digestive health is to our overall well-being. The state of our gut, which is influenced by factors such as our enteric nervous system and microbiome, can significantly impact our mood and mental clarity. By recognizing the signs of gut-related mood disorders, such as those caused by chronic constipation or an imbalanced microbiome, we can address them through diet, exercise, and mindful self-care. It’s important to remember that maintaining a healthy gut isn’t just for digestion—it’s an important aspect of maintaining emotional balance and mental health. By taking care of your gut, you’re essentially taking care of your mind.