The one that was popular after the London subway bomb?
http://www.sciencedaily.com/releases/2006/10/061004173749.htm Source: University College London
Date: October 4, 2006
Black Tea Soothes Away Stress
Daily cups of tea can help you recover more quickly from the stresses of
everyday life, according to a new study by UCL (University College
London) researchers. New scientific evidence shows that black tea has an
effect on stress hormone levels in the body.
The study, published in the journal Psychopharmacology, found that
people who drank tea were able to de-stress more quickly than those who
drank a fake tea substitute. Furthermore, the study participants who
drank a black tea concoction four times a day for six weeks were found
to have lower levels of the stress hormone cortisol in their blood after
a stressful event, compared with a control group who drank the fake or
placebo tea for the same period of time.