Do you ever associate your digestive system with your brain? They’re two completely separate body parts, right? Wrong. The gut and the brain are incredibly highly connected. It’s called the gut-brain axis, and here we explain how important this unison is to our health.
“All disease starts in the gut” – Hippocrates
More and more ‘gut health’ is being talked about as being a prime part of our overall health. People are starting to understand that looking after our gut microbiome is really important.
The gut microbiome refers to all the tiny microorganisms and natural bacteria that live in your intestinal tract. These microorganisms and the bacteria are critical to your health.
The gut-brain axis is an element of our health that is gaining interest as being an integral part of how our body works.
This article will discuss what the gut-brain axis actually is, how it works, and how we can look after it.
Gut-brain axis explained
How often have you heard the saying ‘follow your gut’, or ‘I had a gut feeling that would happen’? These are so commonly used, as well as knowing the butterfly feeling in your stomach. Have you ever stopped to wonder what causes them?
The feelings that you get suggest that there must be some form of communication or connection between your brain and your gut.
It is that communication that is going on that is given the term gut-brain axis. The brain and gut are both physically and chemically connected. It is this gut-brain connection that links your central nervous system (CNS) in your brain with the enteric nervous system (ENS) in your gut.
If we are hungry, then our brain will release the juices in our stomach before the food is even digested, showing that is a direct link between the two. This relationship goes both ways. If we are experiencing stress, anxiety or depression, then it can cause distress in the gut as well.
Ideally we want our gastrointestinal system to be in a state of homeostasis. Thus, meaning balance. Our gut is an incredible organ, responsible for many important roles within the body.
What does our Gut do?
Our gut helps our body work. It helps break down the food we eat, produce energy, absorb nutrients, aids hormonal balance and eliminates waste and toxins from the body.
It is far beyond just digesting foods, and being responsible for flatulence and bowel movements!
Did you know that our gut houses 70% of our immune system? That itself tells you how much we should prioritise our gut health and ensure that it is in a healthy state. It also explains the meaning behind the quote by Hippocrates, at the start of this article. That being, that diseases and illnesses can start within an unhappy gut.
Our gut can tell us if it isn’t happy, if it is in disharmony or there is perhaps a malfunction going on somewhere in the body. However, it isn’t always that easy to understand what is going on, as the gut does not exactly spell it out.
The gut uses its functions to help communicate what it needs. For example, ‘tummy rumbling’ for hunger, and perhaps a slight contraction pain to signal you to head to the bathroom.
Let’s take a look at how the gut communicates possible disharmony.
Bathroom frequency
We can’t talk about the gut without talking about bowel movements. There is no ‘set’ routine which is the right amount of times a person should go to the toilet. Every person’s gut is different and what is important is that your gut has its own consistent pattern. This could be three times a day to four times a week.
So when this pattern is out of sync, and perhaps you haven’t been for days or maybe you cannot get off the toilet with diarrhoea, then this is your gut telling you something isn’t quite right.
If you suffer with constipation, you are holding onto waste for a longer time. Your body will reabsorb the toxins it is supposed to be expelling. This will create health implications if it is continuing to happen. It also shows that the digestive system is sluggish and not able to function correctly.
Mood
Our gut is responsible for producing neurotransmitters that are responsible for our mood. Neurotransmitters are chemical messengers for the brain. They help our brain control emotions and feelings.
If we are not consuming a diet that allows our gut to be able to produce these neurotransmitters, then our mood can be affected negatively. Therefore, causing mental health disorders. Conversely, if we consume a diet rich in vitamins, minerals and other nutrients it can act as a real mood booster.
We produce many of these neurotransmitters within our gut microbiome. Serotonin, which is known as the happy hormone, is largely produced in the gut. Gamma aminobutyric acid (GABA) is responsible for anxiety, and is also produced by the microbes in your gut.
This makes it very clear that a healthy gut is good for our brains. If we are not looking after our gut microbiome, then this makes it harder to produce neurotransmitters needed for a healthy mind.
If you are suffering with any mental health disorder, then addressing your diet might help ease your symptoms.
Fatigue
We need to be eating foods that we can digest easily, and foods that give our bodies much needed nutrients.
If we eat ultra-processed and sugar-rich foods, it will create an unhealthy gut microbiome, and also cause sugar spikes. Collectively, this will cause us to suffer with fatigue.
A healthy diet supplies you with energy and gives you a boost to be active and feel uplifted. A sluggish digestive system, on the other hand, will be reflected in your body and mind as it works hard to digest unhealthy foods.
Focusing on foods that are rich in Vitamin B will help give your body energy.
How do the brain and gut communicate?
The brain and gut communicate through the vagus nerve. This is a large nerve in the body which runs from your brain to your colon.
Your brain, central nervous system (CNS) and gut all contain neurons. Neurons are cells that basically tell your body how to behave. Your brain contains nearly 100 billion neurons, and your gut contains almost 500 million.
All these neurons are constantly travelling up and down the vagus nerve. The neurons will feedback information from the intestines to the brain, and will project any stress response to the gut.
The vagus nerve plays a role in the parasympathetic nervous system. The parasympathetic nervou