On 21 April 2003 the Brigham and Women's Hospital released details of a research project which indicated that the amino acid L-theanine may help the body's immune system response when fighting infection, by boosting the disease-fighting capacity of gamma delta T cells. The study included a four-week trial with 11 coffee drinkers and 10 tea drinkers, who consumed 600ml of coffee or black tea daily. Blood sample analysis found that the production of anti-bacterial proteins was up to five times higher in the tea-drinkers, an indicator of a stronger immune response.
L-theanine has also been found to increase alpha wave production in the brain, which is associated with a state of "alert relaxation".
===Lowers chances of cognitive impairment=== A 2006 study showed that elderly Japanese people who consumed more than 2 cups of green tea a day had a 50 percent lower chance of having cognitive impairment, in comparison to those who drank fewer than 2 cups a day, or who consumed other tested beverages. This is probably due to the effect of EGEC, which passed through the Blood Brain Barrier.
L-theanine has also been found to increase alpha wave production in the brain, which is associated with a state of "alert relaxation".
===Lowers chances of cognitive impairment=== A 2006 study showed that elderly Japanese people who consumed more than 2 cups of green tea a day had a 50 percent lower chance of having cognitive impairment, in comparison to those who drank fewer than 2 cups a day, or who consumed other tested beverages. This is probably due to the effect of EGEC, which passed through the Blood Brain Barrier.
