They found that after several weeks, the pomegranate group had significantly less cortisol in their saliva, while the placebo group had slightly more. (supernaturalacnetreatment.com)
So when we drink coffee in the morning, the body produces less cortisol and tends to rely more on the caffeine. (fitnessandpower.com)
This was further studied and in fact showed optimistic people showed less cortisol and inflammation in their blood, reduced adrenaline, and increased immune functioning. (mindbodygreen.com)