Your body can definitely metabolize medicine. If it couldn't metabolize medicine, it would then render the medication useless as it would just pass through your body unabsorbed.
Caffeine has been shown to negatively affect the efficiency in which the body metabolizes Vitamin D. While the caffeine does not actually deplete the body's store of vitamin D the presence of caffeine will slightly deplete the amount of vitamin D the body is able to metabolize. Since vitamin D is a component necessary to metabolize calcium, regular overdose on caffeine can be very detrimental to your bones' health this is especially true for women over the age of 50 who are at a higher risk to develop osteoporosis. In addition a vitamin D deficit can be a contributing factor to depression. Caffeine should be avoided. Most people drink coffee when they wake up and mid-afternoon. The reason most people are so tired in the morning is that they are simply dehydrated. If you find yourself being lethargic in the afternoon you are probably dehydrated and relying solely on carbohydrates for energy. Exercise, a balanced diet, enough sleep and drinking 64 ounces of water a day will ensure a healthy, alert, vibrant body.
No, the body does not need caffeine. People who are addicted to caffeine might think they need it, though.
Caffeine begins to affect your body very quickly. It reaches a peak level in your blood within 30 to 60 minutes. It has a half-life of 3 to 5 hours. The half-life is the time it takes for your body to eliminate half of the drug. The remaining caffeine can stay in your body for a long time. Effects can last from 8 to 14 hours
metabolize
the effect of caffeine is it keeps you awake and keeps the movement of the body 2 as faster
One 12 Ounce Beer An Hour
Humans are actually one of the only creatures that can safely metabolize caffeine without too many adverse side effects. Studies have shown that Caffeine is considerably toxic to other animals, especially smaller animals. While I have no first hand experience I can only imagine that the Caffeine would kill the fish.
No, It sometimes depends on how your body reacts to caffeine..
into the bloodstream
Caffeine is not bad for your brain , but can be bad for other parts of your body.
Mixing caffeine with alcohol fools you into thinking that you are not as drunk as you really are. That can easily affect your whole body -- permanently.See the link below for recent research.