It is a temporary mental stimulate that helps give the get up and go. Coffee has a high content of caffeine, which explains why most needs it in the morning to get us up and going. There are drawbacks in having a lot of caffeine also. Caffeine can have withdrawal symptoms, most experience mild symptoms. Caffeine is known to also cause insomnia.
Caffeine also lowers the body's calcium absorption by frequent urination.
There are many sources of caffeine. Coffee can have up to 180 milligrams of caffeine according to which brand and how you prepare. Tea is another source of caffeine is also contains a high content of caffeine. Most soft drinks, chocolates, and some painkillers also contain caffeine. If you are pregnant it is advised to limit the intake of caffeine due to some studies have found a high content of caffeine may cause low birth weight.