From Washington, D.C., at the Fourth International Scientific Symposium on Tea and Human Health
Many people reach for a cup of coffee when they need to concentrate. People with flagging focus might, however, get more bang for the buck with a cup of tea. Theanine, an uncommon amino acid found almost exclusively in tea, works with caffeine to boost the activity of brain neurons, new data show.
John J. Foxe of the Nathan S. Kline Institute for Psychiatric Research in Orangeburg, N.Y., and his colleagues recruited 16 people for tests of attentiveness on four days. Before testing, each individual drank a glass of water. On 3 days, the drink was spiked with 100 milligrams of theanine, 60 mg of caffeine, or both. The theanine dose was equivalent to that in 4 to 5 cups of tea, and the caffeine translated to about 2.5 cups of tea.