The same research team at Loma Linda, California, conducted a similar study recently to see if the anticipation of laughter that was shown to boost immune systems could also reduce the levels of three stress hormones: cortisol (“the stress hormone”), epinephrine (adrenaline), and dopac, a dopamine catabolite (brain chemical which helps produce epinephrine).

They studied 16 fasting males, who were assigned to either the control group or the experiment group (those anticipating a humorous event). Blood levels showed that the stress hormones were reduced 39, 70, and 38 percent respectively. Therefore, researchers suggest that anticipating a positive event can reduce detrimental stress hormones.