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The Second Brain

By on Mar 10, 2014

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The second brain is actually your gutThe second brain is a phrase that has been mentioned in various books and articles, but what actually is our second brain, what does it do and how can we look after it?

Many studies have been conducted over the past few years which have analysed the importance of the second brain and its connection to various chronic illnesses that in the past would have been overlooked.

The second brain is actually the gut, which starts at the oesophagus and ends at the anus. The wall of the gut consists of various types of neurons and neurotransmitters that produce up to 95% of all serotonin in the body. These neurotransmitters also produce 50% of all dopamine that is produced in the body. The vagus nerve connects the digestive system to the brain. Serotonin and dopamine are widely regarded as “feel-good” molecules that are involved in the prevention of depression and in the regulation of appetite and sleep. Dopamine is also heavily involved in illnesses such as dementia and Alzheimer’s disease.

A simple example of the connection between the two brains is how fatty foods can make us feel good, and the digestive reaction to stress such as the feeling of “butterflies” in the stomach.

This indicates that the second brain could potentially play a vital role in the prevention and treatment of illnesses such as anxiety, depression, eating disorders, insomnia, obesity, dementia and Alzheimer’s disease.

With this connection in mind, how can we look after and nourish our second brain? Studies have found that certain strains of probiotics can result in the production of neurotransmitters including serotonin, dopamine and gamma-aminobutyric acid (GABA) which are necessary for a healthy neuro function.

Scientists have also found that these beneficial bacteria change the expression of certain receptors in the brain. This is communicated via the vagus nerve, which is a direct link between the gut and the brain. Preliminary animal research has found that a variety of these friendly bacteria may help to treat a number of mental illnesses such as depression, autism and anxiety.

We can help to maintain our digestive health, by eating a diet rich in fruit and vegetables and avoiding excess sugar, salt, animal fats and processed foods.

Until further recommendations are made, probiotics such as acidophilus and bifidus, L-glutamine and essential fatty acids can help to nourish the digestive system and reduce inflammation.



New Scientist Dec 2012.

What Doctors Don’t Tell You, March 2013.