Gratitude: why saying a simple ‘thank you’ can make us feel better
It is a complex social emotion that involves the brain, emotions, health and even the way we relate to others.
Key points
There are words so simple that we risk forgetting their significance. ‘Thank you’ is one of them. We say it every day (hopefully!), sometimes almost automatically, out of politeness or habit. Yet to truly pause and reflect on the meaning of that word is to acknowledge something: a kindness received, a person who has stood by us, a happy moment – but also something that we all too often take for granted in our lives. And that is precisely why it is no coincidence that a day is dedicated to gratitude. 21 September marks World Gratitude Day, which originated in Hawaii in 1965 from the idea of creating an occasion capable of uniting different people and countries around the sentiment of gratitude. In the years that followed, the occasion spread internationally and, in 1977, was also celebrated at the United Nations headquarters in New York.
A day, then, to remind us of a word that may seem insignificant but can have consequences that are anything but trivial. Because gratitude is not just about the way we relate to others: it affects the brain, our emotions, our health and even the way we conduct ourselves in relationships.
When the brain recognises the value of what we receive
Gratitude is much more than just a simple ‘thank you’. It is a complex social emotion that involves various brain circuits linked to reward, the perception of value, the ability to recognise others’ intentions, social bonding and the regulation of emotions.
“Gratitude is a complex social emotion,” explains psychiatrist Claudio Mencacci, Co-President of the Italian Society of Neuropsychopharmacology and Director Emeritus of Neuroscience, Fatebenefratelli Hospital in Milan, “which arises from the integration of brain circuits that process reward, value, the intentions of others, social bonds and emotional regulation”.
This is also why the feeling of gratitude can have effects that extend beyond the moment when we simply say ‘thank you’. According to Mencacci, ‘the general tendency to notice and respond with gratitude to life’s positive experiences’ can have a protective effect on health, contributing to quality of life and, in particular, helping to counteract certain risk factors for cardiovascular disease. According to the expert, these effects relate to both mental and physical health: ‘a reduction in anxiety and depression, and an increase in resilience’ on the one hand; ‘improved sleep, a stronger immune system, reduced inflammation and increased antibody production, and lower blood pressure’ on the other.

