"The results of the experiment demonstrate that the mere act of writing about basic thoughts and feelings about coming to college reduces the number of health center illness visits for college freshmen over the following 4-5 months relative to students who write about superficial topics. Equally important, the lack of any meaningful wave effects indicates that whenever individuals confront their thoughts and feelings about college, positive health effects follow (p. 535)."
Accelerating the Coping Process by J.W. Pennebaker, M. Colder & L.K. Sharp