
16. Anxiety and depression
Millions of people around the world suffer from anxiety or depression, and the causes vary from situational to chemical. The role of diet on our health cannot be underestimated. In recent times, science has been paying closer attention to the relationship between the brain and the digestive system.
It turns out that the digestive system produces 90% of the serotonin produced by the body. Serotonin is a hormone that makes us feel happy, and many anti-depressant medications focus on restoring the balance of serotonin in the brain. But what about the role of the gut?

Another fascinating finding is that the brain and the gut contain 30 identical neurotransmitters. These chemicals, of which serotonin is just one example, carry messages around the brain and the body. They are also responsible for how we feel. It follows, then, that if we have an unhappy digestive system, we’re likely to feel depressed. Interestingly, scientific studies have found gastrointestinal inflammation in a large number of people suffering from depression.
This inflammation is one of the main overarching symptoms of food intolerance, which can be linked to depression. That relationship goes both ways. A depressed mind influences the gut and vice versa.