Black tea caffeine was first discovered in 1827. Called theine, the substance was known to have very similar effects as caffeine in coffee. Eventually, it was shown that theine of tea was actually identical to caffeine, and since then, the term has been dropped.
The relief from fatigue we find in drinking tea can be attributed to its caffeine content. Black tea caffeine is a stimulant that has been shown to increase speed in reaction time, increase alertness, and improve concentration.
The physical effects include stimulation of digestive juice, the kidneys, and the metabolism in ways that possibly help eliminate toxins. An increase of mental alertness, shortening of reaction time, and improving efficiency of muscle action is brought about by caffeine's stimulation of the heart and respiratory system, bringing more oxygen to the body.
A recent study on coffee shows that caffeine helps improve brain power performance and can be quite healthy, helping reduce the risk of heart disease and countless other diseases. However, because the study is still very new, the findings remain largely uncorroborated by other studies. Dieticians still warn against the bad effects of caffeine when consumed in large quantities. Because of its stimulating effects, caffeine can lead to heart palpitations, shortness of breath, and insomnia.
Source : articlesbase
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