Decades of studies have demonstrated a positive correlation between writing (particularly journaling) and health. Take, for example, the many studies of psychologist James Pennebaker at the University of Texas. In one, he asked half of his participants to write 20 minutes a day, three days in a row. That's it. Even months later, those who journaled were much happier than those in the control group. As New York Mag once reported, "in the months after the writing sessions, they had lower blood pressure, improved immune function, and fewer visits to the doctor. They also reported better relationships, improved memory, and more success at work."