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  • Writer's pictureZoe H

Brain and gut connection

Updated: 6 days ago

The brain and the gut are two of the most important organs in the body. The brain is responsible for our thoughts, feelings, and actions, while the gut is responsible for digestion and absorption of nutrients. However, these two organs are not as separate as we might think. In fact, there is a strong connection between the brain and the gut, known as the brain-gut connection.


One of the key links in the brain-gut connection is the vagus nerve. The vagus nerve is the longest nerve in the body, and it connects the brain to the gut. The vagus nerve carries information from the gut to the brain, and it also carries information from the brain to the gut. This means that the brain can influence the gut, and the gut can influence the brain.


One way that the brain can influence the gut is through emotions. When we feel stressed or anxious, the brain releases hormones that can cause the gut to become inflamed. This inflammation can lead to symptoms such as bloating, gas, and diarrhea. On the other hand, when we feel relaxed and happy, the brain releases hormones that can help to calm the gut.


The gut can also influence the brain through emotions. When we eat foods that we associate with positive memories, the gut releases hormones that can make us feel happy and content. For example, if we always eat our favorite childhood meal on Christmas Eve, the smell of that meal can trigger happy memories of Christmas, which can make us feel happy.


The hypothalamus is a part of the brain that is responsible for a variety of functions, including regulating emotions. The hypothalamus is also connected to the gut through the vagus nerve.


When we eat a meal, the vagus nerve sends signals to the hypothalamus. These signals tell the hypothalamus how much food we have eaten and how our body is reacting to the food. The hypothalamus then uses this information to regulate our emotions.


For example, when we eat a large meal, the hypothalamus releases hormones that can make us feel full and satisfied. This can help to improve our mood and reduce stress.


Our sense of smell is closely linked to our emotions. This is because the olfactory bulb, the part of the brain that processes smell, is located near the limbic system, which is responsible for emotions.


When we smell something, it triggers a cascade of chemical reactions in the brain. These reactions can lead to a variety of emotions, such as happiness, sadness, anger, or fear.


For example, the smell of freshly baked cookies can trigger happy memories of childhood, which can make us feel happy. On the other hand, the smell of smoke can trigger memories of a fire, which can make us feel scared.


How Triggers Can Awaken Trauma


Triggers are stimuli that can cause a traumatic memory to resurface. Triggers can be anything from a smell to a sound to a sight.


When we are triggered, the brain releases hormones that can cause our body to go into a state of fight-or-flight. This can lead to symptoms such as anxiety, panic, and flashbacks.


For example, if someone was sexually abused as a child, they may be triggered by the smell of perfume. The smell of perfume may remind them of their abuser, which can cause them to feel anxious or scared.


By understanding the brain-gut connection, we can better understand how our emotions and thoughts can affect our physical health. We can also learn how to manage our emotions healthily, and how to avoid triggers that can awaken trauma.


Photograph of body and stomach and brain illuminated
Photograph of body and stomach and brain illuminated



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