"We found that people who habitually accept their negative emotions experience fewer negative emotions, which adds up to better psychological health," said Iris Mauss, an associate professor at University of California, Berkeley in the US.
Researchers tested the link between emotional acceptance and psychological health in more than 1,300 adults.
They found that people who commonly resist acknowledging their darkest emotions, or judge them harshly, can end up feeling more psychologically stressed.
By contrast, those who generally allow such bleak feelings as sadness, disappointment and resentment to run their course reported fewer mood disorder symptoms than those who critique them or push them away, even after six months, researchers said.
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"People who accept these emotions without judging or trying to change them are able to cope with their stress more successfully," Ford said.
Researchers conducted three separate studies on various groups both in the lab and online, and factored in age, gender, socio-economic status and other demographic variables.
In the first study, more than 1,000 participants filled out surveys rating how strongly they agreed with such statements as "I tell myself I should not be feeling the way that I am feeling."
In the second study, more than 150 participants were tasked with delivering a three-minute videotaped speech to a panel of judges as part of a mock job application, touting their communication skills and other relevant qualifications. They were given two minutes to prepare.
After completing the task, participants rated their emotions about the ordeal. Researchers found that the group that typically avoids negative feelings reported more distress than their more accepting peers.
In the final study, more than 200 people journaled about their most taxing experiences over a two-week period.
The study was published in the Journal of Personality and Social Psychology.