National Center for Health Statistics conducted a survey of 127,545 gathering that
Married Life May Be Happier and Healthier "married people reported better overall health, less low back pain, fewer headaches and less stress than singles. They also were less likely to drink and smoke, and were more physically active."

Now the only issue remains is getting all the single men out there to forgo their fear of commitment and tie the knot.

Someone please let me know when that survey takes place.