The scientific journal Journal of Physiological Anthropology (JPA) published a study conducted with the aim of analyzing the anti-stress effect of two types of tea against a mental stress task load
To carry out this study the researchers were based on a group of 18 people, who were monitored before and after the activity the concentration of chromogranin A (CgA) in saliva, considered as an index of the activity of the system nervous self
The conclusions of it were that the level of CgA increased after the mental tasks, but the ingestion of green tea inhibited this increase; The anti-stress effect was even greater after consumption of white tea, which also reduced the score of total mood disorders (TMD) in the Profile of mood states (POMS).
There was even the fact that even subjects who had tea at room temperature tended to perform more calculations on the arithmetic task than those on the hot water treatment condition, suggesting that white tea at natural temperature can also improve the Mood during and after the mental stress load.