The lethal dose is said to be 12.5 g -14.6 g for an adult male, which is 360 cups of tea or about 140 cups of coffee that needs to be consumed in a short period of time. More of this later.) As undesirable side effects, Mayo Clinic lists the following for caffeine: insomnia, nervousness, restlessness, irritability, stomach upset, fast heartbeat, muscle tremors. (On average an 8 oz cup has about 45 mg of caffeine for tea and 142 mg for coffee. This translates to around 9 cups of tea, or about 3 cups of coffee. (Coffee drinkers especially seem to have it bad.)Īccording to Mayo Clinic, up to 400 milligrams (mg) of caffeine a day is supposed to be safe for healthy adults. The positive effects of caffeine include improved motor performance, decreased fatigue, enhanced sensory activity, and increased alertness. In everyday life it is found in tea, coffee, soft drinks, chocolate and used in many drugs for cold, allergy and pain relief.Ĭaffeine stimulates our central nervous system, heart, blood vessels, and kidneys. Caffeine is odorless but has a bitter taste. These plant compounds have both beneficial and harmful physiological effects on the human body when ingested.Īlthough the role of caffeine, or for that matter other alkaloids, in the plant world is not quite clear, it is thought to have survival and reproductive functions. It forms part of the alkaloid group that includes morphine, strychnine, quinine, ephedrine, and nicotine many of which are used to make drugs. Before we tell you about tea and caffeine, let us first quickly go over what caffeine is.Ĭaffeine is an organic compound found in plants.
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