The β carotene of the anti- oxidizing agent the high to lung cancer Wei crowd be harmful

Many people thought to absorb everyday before higher calculate of the anti- oxidizing agent can protect human body cell to don't need under the influence of carcinogen, as a result reduce the occurrence of cancer.A few clinical trials express that the β carotene and vitamin A can reduce the incidence rate of lung cancer. For the sake of the verification β carotene and the prevention effect of the vitamin A to the lung cancer, the American national cancer center(NCI) started carry on a large double blind clinical trials in 80's in last a century.Study medium smoke cigarette crowd with is other high Wei lung cancer crowd to be been divided into 2 sets, 1 set takes the placebo which didn't cure effect everyday, but drive test of 1 set takes to teach the β carotene and vitamin A that the Gao calculate everyday.Two sets of experiment crowds drive compare outbreak rate and death rate of lung cancer disease. The purpose of this experiment originally wants to verify the anti-cancer effect of β carotene and vitamin A, but make person surprised is outbreak rate and death rate that the experiment not only didn't prove that the β carotene and vitamin A can prevent°from lung cancer, but also will go up lung cancer.Not only this, take these anti- oxidizing agents will also raise the incidence rate and death rate of heart attack.Because these stumble on, the experiment personnel have to stop this an experiment in 1996. In 1996 after this research end, the NCI researcher continue long-term of understand these nourishment vegetables with the result that the probability and death rate of the lung cancer.After continuing to observe for 8 years, researcher declares at the end of in 2004, after even stopping take β carotene for several years, the lung cancer incidence rate which once takes the lung cancer high Wei crowd of these anti- oxidizing agents still keeps wanting a higher than the high Wei crowd that didn't take 12% and the death rate is 8% in height.And these anti- oxidizing agent's bane toward female the Gao is at the male. The researcher is concrete to the β carotene and the vitamin A currently of the cancer-causing mechanism doesn't understand, but has a research to think that the β carotene will cause of have already been damage of lung cell of excrescent change, cause the continuously raise of the rate of the lung cancer outbreak.But have to what to point out BE, what this research of the United States aim at is more and greatly the lung cancer high Wei crowd which takes to calculate β carotene and vitamin A.These anti- oxidizing agent for don't smoke cigarette of healthy person and have the disadvantageous influence of same not necessarily.Moreover, edible rich contain the fresh fruit vegetable ofβ carotene and other vitamins beneficial to human body health, will not produce bane. Reference:the J Natl Cancer Inst. 2004 Dec 1;96(23):1743-50.