well...caffeine has some negative effects which is :
- you throw more water from your body than absorb the volume of water you drink..
- can cause you loose sleep..
- for pregnant woman it increase the risk to born the baby with low weight and also can cause damage on the embryo
- can barrier the grow of the memory and on the end can cause you loose your memory..
- caffeine can be a poison for brain cell,
- can cause bigger risk for hard attack if you consume 5-6 cup /day
- can reduce a lot energy on your body..