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Caffeine sensitivity is dependent on our genetics. It is the DNA structure in our body that determines how much your body can process and metabolize caffeine. Whether you have a fetish for coffee, tea, cola or chocolate, you are actually consuming caffeine along with the other ingredients present in these foodstuffs. Caffeine compels the adrenal glands to produce stress hormones like cortisol and adrenaline. While you may get awake and alert because of this reaction, your friend might start feeling excessive jittery with a faster heartbeat. Many people take this drug to increase their concentration level. I know a friend who used to consume at least 2-4 cups of coffee daily to stay awake for studying till late night. She never felt any uneasiness due to consumption of caffeine, but there are many who if consumed more than a single cup of their favorite coffee feels uneasy and literally shaken. They experience a fast pulse, quick breathing and muscle tension. These people also feel jit...