One of the main chemical messengers involved in our sense of wellbeing is called serotonin. Serotonin affects several key body functions including mood, digestion and sleep. It is often called our body's natural 'feel good' chemical. At normal levels we feel more focused, emotionally happy and calm. At reduced levels, we are more prone to anxiety and low moods. Antidepressants for example target serotonin in our brain.
