In a unique move to enhance physical and mental well-being, the local government in the Yamagata prefecture in northern Japan has introduced a law calling on residents to laugh at least once every day.

The law also designated the eighth day of every month as the day for residents to promote health through laughter. Additionally, workplaces are encouraged to foster an environment filled with laughter.

The rule is based on a research study carried out by a team from Yamagata University School of Medicine. The study suggests there is strong evidence that laughing has several health advantages. “Our findings suggest that increasing the frequency of laughter might reduce cardiovascular disease risk and increase longevity,” the authors stated.

The study included around 17,152 participants who were 40 years of age or younger. After completing the questionnaire, participants health was monitored for several years.

However, the new rule has faced criticism from several politicians who believe it infringes on people’s constitutional rights.