Feeling blue at work? According to Keio University professor Takashi Maeno, there are science-backed reasons explaining why workers may feel so distressed.

Maeno, the dean of the Graduate School of System Design and Management at the university, has used a scientific approach to study psychological well-being. He said modern research has made it possible to learn about what conditions help people feel happy and how to improve workplace happiness.

"Since around the 1980s, researchers have discovered statistical methods to measure people's level of happiness," he said during a recent interview with The Japan Times.