People from Britain and America have apparently have a short-form version of a gene that regulates levels of serotonin, the chemical linked to happiness and French people have the shortest of all. No wonder we think of the French as Les Miserables!
The Danes however, who often top the league of happy countries, and the Netherlands have the lowest proportion of people with the short-form version. This means that Americans with ancestors from Denmark would also be happier.
Professor Andrew Oswald’s team at Warwick University looked at 131 different countries. Genetics turned out to be one of the most important factors in determining happiness.
Happiness league tables often take into account job satisfaction, health, wealth, education and political stability. Have a look at the OECD Happiness Index and decide for yourself.