With doses exceeding 10g of caffeine, grand mal seizures and respiratory failure can result in death. This disorder has been called Caffeinism. Colas with caffeine and sugar added cause the greatest calcium and bone loss. The wake-up call of a morning cup of tea becomes tossing and turning if you drink two cups of tea before going to bed. It can also interfere with a persons ability to sleep.
Caffeine can also have some serious side effects.
It is known to raise blood pressure. People with high blood pressure or heart conditions are told by doctors to eliminate caffeine from their diet. Caffeine also causes a flushed face, dieresis, disturbances in stomach and intestines, muscle twitching, rambling flow of thought and speech, periods of inexhaustibility and disturbances in muscular activity. For women, too much caffeine has been linked to infertility. Pregnant women have an increased chance of miscarrying during pregnancy.