If a dear friend, at a very difficult time (one of the worst) in your life, told you: “The only important thing in this life is to be happy,” what would you think? Maybe at that difficult time it seems like a utopia, but here is a secret: happiness can be trained! With solid and constant preparation it is possible to achieve surprising results and find the way to move from a difficult life to a happy existence. In his new book, psychoneuroimmunologist Xavi Cañellas faces the widely held belief that happiness is ephemeral, that we can only feel it for a few moments, and shows us that we should not resign ourselves to a life sprinkled with a few sporadic sparks of happiness. Achieving it will depend on many factors, both internal and external, with special emphasis on one of them: the family. As the Buddhist saying goes: “Whoever believes he is enlightened, should go spend a week with his family.”

With a bit of humor and a lot of truth, The Only Thing That Matters analyzes in depth the implications that the family environment has on the achievement - or not - of our life goals. There is only one step left for you to stop looking and start working on your happiness: turn this book over and immerse yourself in reading. When you get to the end, especially if you have practiced the proposed exercises, you will find yourself a good distance from where you are at this moment in life. Do you accept the challenge?

Xavi Cañellas is a psychoneuroimmunologist and has been practicing clinical medicine for twenty years. He graduated in Physiotherapy from the University of Salamanca (USAL) and then completed the European Master's Degree in Clinical Psychoneuroimmunology and the Master's Degree in Molecular Biology and Biomedicine, both at the University of Girona (UDG). Together with his three partners, he founded Regenera, a company dedicated to training in clinical psychoneuroimmunology. He is director and teacher of the Master's Degree in Clinical Psychoneuroimmunology at Regenera University. He is also a popularizer, lecturer and teacher in various master's degrees and courses in the national and international territory. He is co-author of the book Niños sanos, adultos sanos (7th ed., Plataforma Editorial, 2016), Alimentación prebiótica (9th ed., Plataforma Editorial, 2017) and author of Tu primer cerebro (7th ed., Plataforma Editorial, 2020). He is also an advisor to elite athletes and founder of Regenera Élite.