When you have butterflies in your stomach or a gut feeling about something, it’s probably a sensation that results from the connection between your gut and brain. Medical researchers have found that the gut and brain are directly and intricately linked, constantly communicating with each other. This means that your digestive health can have an impact on your cognitive performance and mental well-being. Check out this detailed guide to find out how the gut-brain connection works.
Introduction to the Gut-Brain Axis
The gut-brain axis refers to the bidirectional communication network that links your enteric nervous system and central nervous system. It includes direct and indirect signaling pathways between peripheral intestinal functions and cognitive and emotional centers of the brain. It also involves complex crosstalk between the immune, endocrine, and autonomic nervous systems.
Also called the “second brain,” the enteric nervous system is an intricate web of motor neurons, sensory neurons, and interneurons embedded in the lining of your gastrointestinal system. While it doesn’t seem to be capable of thought, it communicates with your brain to support a variety of digestive functions, including swallowing, releasing enzymes that break down food, and controlling blood flow for improved nutrient absorption.
Interestingly, it’s estimated that your enteric nervous system has about 500 million neurons, which are connected to your brain through innumerable nerves. The vagus nerve is among the largest and most important nerves in the gut-brain axis. In a study, people with Crohn’s disease or irritable bowel syndrome were found to have reduced vagal function. As a result of a weaker vagus nerve, they showed more severe symptoms of state anxiety and depression. This proves that the vagus nerve can help with stress management.
Gut Microbiota and Brain Health
Aside from an extensive network of nerves, there are also natural chemicals that connect your gut to your brain. Known as neurotransmitters, these chemicals are produced in your gut and brain and play a significant role in controlling feelings and emotions. For instance, the neurotransmitter serotonin helps regulate your mood and create feelings of happiness. Also, your gut cells and microbes make gamma-aminobutyric acid (GABA), a neurotransmitter that can lower fear and anxiety levels. Studies have revealed that certain types of probiotics can increase GABA production and mitigate symptoms of anxiety and depression.
In addition, the trillions of microbes in your gut also produce short-chain fatty acids (SCFAs) that can impact how your brain works, such as butyrate, acetate, and propionate. SCFAs are made through the digestion of fiber, and they can contribute to reduced appetite and other changes in brain activity. Past research discovered that consuming propionate can help lower food intake and control brain response to reward from high-energy food. Butyrate, on the other hand, is vital for the formation of the blood-brain barrier, which allows essential nutrients to reach the brain while keeping harmful pathogens and toxins at bay.
Inflammation and Cognitive Function
The gut-brain axis is also linked through the immune system. Your gut and gut microbes can affect the health and vitality of your immune system by controlling what your body absorbs and what it excretes. If your immune system is working too hard, it can result in inflammation and make you more susceptible to brain disorders such as Alzheimer’s disease and depression.
Certain microbes in your gut produce lipopolysaccharide (LPS), an inflammatory toxin that can cause inflammation if an excessive amount of it gets into your blood. This usually happens when there’s leakage in the gut barrier. Studies have shown that inflammation and high levels of LPS can increase your risk of mental health conditions such as severe depression, schizophrenia, and dementia.
Gut Health, Nutrients, and Brain Performance
The trillions of friendly bacteria in your gut assist with the breakdown of food that remains following digestion in the small intestine. Known as fermentation, this process enables your body to absorb nutrients more efficiently.
However, your gut bacteria can become imbalanced due to diarrhea, stress, dietary changes, and antibiotics. Consuming certain foods can help keep your gut microbiome in balance and improve your gut and brain health. For example, omega-3 fats, which are found in oily fish, have been proven in studies to increase the production of good gut bacteria and lower the risk of brain disorders. Also, fermented foods, such as yogurt, cheese, and sauerkraut, contain lactic acid bacteria and other healthy microbes that can boost cognitive function. Other recommendations include high-fiber foods, polyphenol-rich foods, and tryptophan-rich foods.
Probiotics and Prebiotics for Cognitive Well-Being
Your gut microbes can affect your brain health, so changing them can lead to enhanced cognitive performance and well-being. You can alter your gut microbiome by consuming probiotics, which are live bacteria that provide an array of health benefits. Nonetheless, not all probiotics are created equal, and those that promote brain health are commonly referred to as “psychobiotics.” In a small study, researchers discovered that people suffering from irritable bowel syndrome showed significantly improved symptoms of anxiety or depression after taking the probiotic bifidobacterium longum NCC3001.
Another way to boost your gut and brain health is to ingest prebiotics, which are fibers that serve as a food source for the beneficial gut bacteria. One study revealed that consuming a prebiotic called galactooligosaccharides can reduce the amount of cortisol in the body, which is the primary stress hormone.
Gut Health and Neurological Disorders
Studies related to the gut-brain connection have changed the way medical experts think about neurological disorders. Recently, a review of human studies found that people diagnosed with schizophrenia, bipolar disorder, and depression have a similar pattern of microbial species in their guts. More studies are expected to be conducted in the future to explore different methods for treating mental health problems through interventions in the gut, such as fecal transplants and development of drugs that target nerves and neurotransmitters in the gut-brain axis.
When it comes to neurological disorders, prevention is always better than cure. Instead of waiting for more effective treatment methods to emerge, you can start minimizing your risk of mental illness by improving your digestive health.
Boost Your Gut and Brain Health in South Florida Today
By constantly communicating with the brain, your digestive system can help improve your cognitive health and prevent neurological disorders. One thing you can do to keep your gut and brain in good shape is to adopt a holistic lifestyle that includes a healthy diet, regular exercise, and effective stress management. If you live in South Florida, we invite you to explore the digestive and brain health products and services available at the biostation. Feel free to contact us if you have any inquiries.
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