Grit and determination to change your habits can only get you so far... if you want to be happier you have to stop and think about how nice people have been to you and how nice you can be to them in return. This circle of gratitude - the science suggests - will also make you a better friend to one of the most important people in your life... your future self.

Dr Laurie Santos investigates this effect with Northeastern University's Prof David DeSteno - author of Emotional Success: The Power of Gratitude, Compassion and Pride.

For an even deeper dive into the research we talk about in the show visit happinesslab.fm