In excessive doses (between 250-750 mg or 2-7 cups of coffee) can cause anxiety, nausea, headache, muscle tension, sleep disturbances, and heart palpitations (heart palpitations), sometimes anorexia. Meanwhile, if the dose is higher (above 750 mg), will appear a variety of emotional and sensory disturbances, especially hearing and sight.
However, the negative side of caffeine will not only be felt as soon as that. A series of studies have been peering at the long-term effects. In the December 1994 Reader's Digest, citing a research report funded by the US National Institute of Child Health and Human Development and the US National Institute on Drug Abuse, reported that women who consumed 300 mg of caffeine each day had a 27 percent lower chance of becoming pregnant than those who are free from it. Although the mechanism is not known for certain, a hypothesis says, the possibility of this substance can reduce hormone levels, such as estrogen to affect ovulation.
Another situation was revealed by Physicians Medicine in Healhty Eating for Life to Prevent and Treat Cancer. Although the link between coffee and cancer risk is unclear, some studies suggest that coffee may affect DNA and increase the risk of developing bladder and ovarian cancers. In addition, drinking very hot coffee can cause damage to cells in the mouth and throat, which if done repeatedly can trigger cancer in that section.
Similarly, the report of researchers from Harvard School of Public Helath, as noted Balch and Stengler in Presciption for Natural Cures. Despite the questioning, they found that women who consumed 5-7 grams of caffeine per month (equivalent to two cups of coffee per day) were twice as likely to have endometriosis than those who did not consume caffeine.
So even in terms of caffeine expertise "kick" calcium through the urine, which further decreases bone strength, making it easily broken. The Harvard study found, in postmenopausal women who consume lots of caffeine (more than six cups of coffee per day), the risk of suffering a single hip fracture is three times higher than those that do not.
To ngurangin coffee consumption is really hard for who already addicted. But try to reduce little by little, l ato kalo drink coffee mixed with milk and so on. A cup for a day by me is enough.