Not to question it, but this is typical AP lousy reporting.
“A new study found that . . . .”
What new study? Who conducted it? Where was it published? Who sponsored it? What methods were used to obtain this information? What does it mean to be “happy”?
Not even the name of the people who did the study, or funded it, or where it was published.
Well, I am pretty sure that “A new study found that...” was the same professional, reliable organization that ‘discovered’ that mammograms are probably the secret cause of breast cancer......