Scientists have long evidence that coffee or tea can be found to increase endurance. However, recent research shows that eating regular two types of the most popular drinks in this world from brain tumors that often protect the impact on adults.
Although only half a cup of coffee or tea per day may reduce the risk of brain tumors by 34 percent. Dominique S. Michaud of the Faculty of Health Sciences, Brown University, Providence, USA, is chairman of an international team their findings in the November issue of American Journal of Clinical Nutrition.
The idea that coffee and tea health benefits, especially against cancer for regular drinkers with previous studies that demonstrated that the lovers are two drinks can also avoid the risk of Alzheimer's and Parkinson's are supposed to be. Other studies further discussed the possibility that coffee and tea also prevent brain tumors.
In particular, the type of glioma, a cancer, central nervous system of the brain and spinal cord or attacks. Gliomas, including brain cancer causes about 80 percent of cases of malignant brain tumors in adults. However, the results of this study is not itself able to prove that, the two drinks that protect against cancer. "It's all temporary," said Michaud.
"This study should not be a reason for all those whose intake of coffee or tea to change," he continued. Although coffee and tea is a direct effect on risk of glioma, it looks like the effect to be small. Brain cancers are generally rare in the world.
In Europe, for example, the annual incidence rate estimated at between four to six cases per 100,000 women and six to eight cases per 100,000 men. Overall, the likelihood of developing brain tumors someone in their life is less than 1 percent.
But Michaud says, if the intake of coffee and tea, which is higher should protect against gliomas, it was unable to give investigators insight into the cause of the cancer. "Currently we do not know much about the causes of brain tumors," he said.
The study itself evaluates health data from more than 410,000 men and women between 25 and 70 years from the European Prospective Investigation research on cancer and diet created that originated from France, Holland, Italy, Spain, Great Britain, Greece, Denmark, Norway, Sweden and Germany.
Participants were recruited 1991-2000 continuously observed by 8.5 years. In a study carried out a survey that is used as a measure of food, including tea and coffee consumption each study participant. They were also asked to complete questionnaires about medical history, diet, physical inactivity, smoking and other lifestyle factors.
In that time, 343 new cases diagnosed gliomas. Also, 245 new cases of meningioma, other types of cancer, that the tissue that affects surrounding the brain and spinal cord. Overall, consumption of decaffeinated coffee was found very low. While the usual coffee and tea drinking habits vary from country to country. For example, Denmark (the largest consumer of coffee) drink an average of almost 3.5 cups per day.
Or Italian (the most efficient) on average, less than half a cup per day. The highest consumption of tea by participants from the UK and the lowest in Spain made. The addition of beverage consumption on the incidence of brain tumors were related. The research team found that drinking 100 ml (or about 0.4 cups) per day or more may be risk of glioma by 34 percent to be reduced.
In addition, it also concluded that the protective effect of these two drinks seemed a little stronger against a man and seems to apply only to gliomas. According to Michaud, is not clear why there was no evidence of dose-response relationship between coffee and tea consumption with risk of glioma, which is considered generally a strong sign of a possible causal relationship.
But perhaps it relates to the difficulty of accurately measuring the intake of coffee and tea from the study participants, which depends on the report itself. "It is biologically plausible that coffee or tea and may influence the risk of gliomas," he said. A recent laboratory study found, for example, that caffeine is the growth of a type of glioma glioblastoma seemed slow.
In addition, both coffee and tea contain antioxidants, protect cells from damage causes the body to cancer and other diseases can to help. However, it could also coffee and tea lovers, has other characteristics, influence the susceptibility to glioma.
But as far as the features that were not detected caused brain cancer, it is not yet known. Researchers know there are some risk factors. Those who undergo radiation therapy are to treat the most radiation to the head to other types of cancer at high risk of brain tumors in the future. Genetic Pradisposisi apparently plays a role in a few cases of brain tumors. But evidence of food or environmental factors, such as exposure to chemicals in the workplace so far inconclusive. Michaud said, must be confirmed a few studies that identify a relationship between coffee and tea consumption with risk of glioma and the underlying causes.
Dr. Jonathan Friedman, chief of the Texas Brain and Spine Institute at Texas A & M Health Science Center College of Medicine, Bryan, Texas, USA, described the results as "surprising".
"Note, however, is the mechanism to protect why coffee can (a disease) is really unclear," he said. "While the benefits of caffeine itself may be important (the body), but several other common components in a coffee or tea may also be relevant (the cause), such as natural antioxidants," he said.
"But more research is needed to confirm these results and determine how to be the basis of the correlation relationship," Friedman happen outside. Dr. John S. Yu, director of the Brain Tumor Center of Excellence at Cedars-Sinai Medical Center in Los Angeles, United States of America, called the discovery remarkable. "If we have a cure for various diseases that can reduce the risk of suffering about 34 percent, would be a great medicine," he said.
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