Post by enigma on Apr 3, 2004 1:33:11 GMT 8
Tea or coffee.
Tea does indeed contain more caffeine than coffee,but only by dry weight, not by its final concentration in the beverage. Because much more ground coffee than tea leaves are used to brew the respective drinks, coffee typically ends up with a considerably higher caffeine concentration.
The caffeine content of different species of coffee and tea plant can vary widely as can can the presence of other stimulants alkaloids. But the physiological effect of equivalent amount of caffien is the same regardless of its source, because there is only one type off caffeine, namely 1,3,7-trimethylxanthine.
A strong cup of tea contains about the same amount of caffeine as a weak cup of instant coffee. Tea also contains small amounts of theobromine and theophyline which, like caffeine. But they have re;atively weak stimulant effect.
If the tea is brewed for only a short time it will contain little caffeine and therefore may not very stimulating. However in terms of the likely effect on you, your state of caffeine abstinence prior to caffeine consumption is probably more important.
If u are a regular caffeine consumer( three or more cups of coffee or tea a day), you will feel a noticeable benefit with the first cup of tea or coffee in the morning, mainly caused by removing the fatiguing effects of overnight caffeine withdrawal- after between 8 and 10 hours of caffeine deprivation, caffeine levels in the body have typically fallen by 80 per cent.
In contrast, tea or coffee consumed before bedtime has a less obvios impact, because having consumed several cups during the day –usually at increasing intervals –this last drink will tend only to maintain the body’s levels of caffeine
Tea does indeed contain more caffeine than coffee,but only by dry weight, not by its final concentration in the beverage. Because much more ground coffee than tea leaves are used to brew the respective drinks, coffee typically ends up with a considerably higher caffeine concentration.
The caffeine content of different species of coffee and tea plant can vary widely as can can the presence of other stimulants alkaloids. But the physiological effect of equivalent amount of caffien is the same regardless of its source, because there is only one type off caffeine, namely 1,3,7-trimethylxanthine.
A strong cup of tea contains about the same amount of caffeine as a weak cup of instant coffee. Tea also contains small amounts of theobromine and theophyline which, like caffeine. But they have re;atively weak stimulant effect.
If the tea is brewed for only a short time it will contain little caffeine and therefore may not very stimulating. However in terms of the likely effect on you, your state of caffeine abstinence prior to caffeine consumption is probably more important.
If u are a regular caffeine consumer( three or more cups of coffee or tea a day), you will feel a noticeable benefit with the first cup of tea or coffee in the morning, mainly caused by removing the fatiguing effects of overnight caffeine withdrawal- after between 8 and 10 hours of caffeine deprivation, caffeine levels in the body have typically fallen by 80 per cent.
In contrast, tea or coffee consumed before bedtime has a less obvios impact, because having consumed several cups during the day –usually at increasing intervals –this last drink will tend only to maintain the body’s levels of caffeine
