We've heard an endless amount about positivity and its supposedly life-changing benefits for our health and productivity.
Yet this culture of happiness comes with a potential downside that researchers are only just getting to grips with.
"Directives to smile, be happy and to 'look on the bright side' are everywhere one turns," said Dr Octavia Calder-Dawe, of Massey University's SHORE & Whāriki Research Centre
"New indices and measures are monitoring people's positivity around the world, while guides to positive thinking and 'selfie-made' happiness flood mainstream and social media."
Women, in particular, were encouraged to overcome obstacles through upbeat emotional management and "relentless positivity" – a theory that's found its way from organisational planning to mindfulness blogs.