Tea has far more caffeine than coffee, but why is it less refreshing than coffee? When it comes to refreshing drinks, the first thing that comes to mind is probably Red Bull, coffee and other drinks. The reason they are so refreshing is because the caffeine in them plays a big role. There is a saying that tea is not as refreshing as coffee because it contains mainly theophylline rather than caffeine. Tea would be very angry to hear that! Let's take a look at what caffeine has to do with theophylline. What is the relationship between caffeine and theophylline? Caffeine, specifically caffeine, belongs to the same group of methylxanthine bases as theophylline and theobromine, but there are differences in both molecular structure and physiological effects. Structurally, theophylline and theobromine have one less methyl group than caffeine and have a much milder euphoric effect on the body than caffeine. Caffeine is broken down in the liver by three primary metabolites. It is important...