Mythology antioxidant]
Modern society, a lot of food, health care products are as rich in vitamin C, vitamin E, carotenoids and iodine, selenium and other minerals and the acclaimed, because these substances can not only anti-aging ingredients, but also against a variety of diseases. In fact, these compositions of matter there is a common name: antioxidants. According to statistics, about half of adults are taking all kinds of antioxidant pills every day.
Antioxidants such a great reputation is not surprising. As early as the 1950s, scientists discovered that certain types of cancer, heart disease, diabetes, cataracts, Parkinson's disease and other diseases, are associated with damaging substances called free radicals related. The reason why people will be aging, physical decline, in addition to the age factor can not resist, the main reason is that too many free radicals. Radical is an intermediate product of human metabolism, it is a very active oxide can react with proteins, lipids and other substances within the cell, undermine the stability of these substances within the human body. In this process, the body will produce more free radicals, resulting in a series of destruction. Not only that, but also free radicals to DNA within cells to attack and undermine the structure of the DNA molecule, resulting in an increased mutation rate of genes, then induce cancer. Scientists have found that free radicals induce the direct cause of lung cancer.
Apart from free radicals generated in the body's normal metabolism, ultraviolet rays, electromagnetic radiation, air pollution, smoking, strenuous exercise, too much stress can also induce production of free radicals. Thus, with the accelerated process of industrialization, the body produces free radicals opportunity to people more and more. This means that the impact of modern society of free radicals on people's health is growing.
However, in the 1980s, it was discovered that the diet rich in fruits and vegetables are less likely to suffer from people with radical-related diseases. After the study, scientists found that fruits and vegetables are rich in antioxidants, can effectively neutralize free radicals, thereby inhibiting free radical damage to human cells.
Since then, a new concept was born: Antioxidants are sponges absorbing free radicals, can fight many diseases and can prevent cancer. Nobel Prize winner Linus? Pauling was the first advocate by eating a lot of antioxidants to anti-cancer celebrity. He personally taking a lot of vitamin C, at the age of 93 years old when he died in 1994. This concept has boosted the development of the health care industry. According to the US National Institutes of Health Statistics, Americans are taking all kinds of health food products cost about $ 23 billion a year, an antioxidant food in which a large proportion. A San Francisco market research firm Statistics found that in 2005 alone, sales of various antioxidants has increased by 18%.
Antioxidants anti-cancer [not]
However, with further research scientist oxidants fight, they have yielded an unexpected result: those taking antioxidant-rich health care products, at best a waste of time and money, and at worst is likely to be harmful to health .
- carotene is an important antioxidant, scientists had been thought to help prevent lung cancer smokers. In 1992, the US National Cancer Institute conducted a special study. They recruited about 18,000 lung cancer in high-risk people, who are either smokers or regular exposure to harmful substances. Researchers gave some people taking - carotene, another part without any treatment. Study for less than six years, researchers have surprisingly found that those taking - carotene even worse, they are suffering from lung cancer rate 28 percent higher than the other group. Since then, researchers have made a further study, have also been similar results. In May 2006, experts of the National Cancer Institute published their findings: There is no evidence that the general population should be added - carotene, there is evidence that smokers should not take.
The discovery of the DNA double helix and won the Nobel Prize, is now dedicated to cancer research Watson is bluntly pointed out that the carcinogenic effects of antioxidants is greater than the anti-cancer effect. Watson said that the benefits of eating fruits and vegetables may be brought from other components of fruits and vegetables or from a complex mixture of ingredients, not the antioxidants. Numerous studies of vitamin C, vitamin E, have found that these antioxidants supplementation alone, reducing the chances of illness and prolong the life of people and there is no obvious effect, while vitamin E but will increase the risk of people suffering from cancer.
Watson said: "A lot of patients with advanced cancer, probably because the body has accumulated a lot of antioxidants, which leads to no cure for." Watson This statement is really very different, and people's traditional knowledge. Since cancer is caused by free radical damage to DNA molecules, and precisely the antioxidants inhibit free radical weapon. Why antioxidants eat more but will increase the risk of people suffering from cancer it?
Radical anti-cancer [value]
It had been widely believed that free radicals are the culprit leading to human aging and many diseases by scavenging free radicals, can promote human health, the fight against cancer. However, Watson's research shows that, despite the free radicals damage cell structure and cause a series of diseases, but free Ji Qiaqia played a key role in the prevention and treatment of cancer, not only help control free radicals diseased cells, it is also key to ensuring a variety of anti-cancer drugs and radiation therapy play a role.
In multicellular organisms, every cell is a certain life, the organism is not required when certain cells or these cells can no longer function properly, the organism will take the initiative to start a program, these induced cell death. For this process to maintain a stable internal structure of the organism, the timely removal of abnormal, necrotic cells is very important. Many studies have found that free radicals play an important role in the induction of programmed cell death in. Currently known, radiation therapy is through radiation so that the body produces more free radicals, which induce cancer cells into programmed cell death, so as to achieve the purpose of killing cancer cells. Despite the different approaches of various types of chemotherapy drugs to kill cancer cells, but they are also the main ways to make the body produce more free radicals.
All this shows that people want is not as radical as always harmful, and antioxidants are not always healthy. A recent study of pancreatic cancer found that those rapidly dividing cancer cells, the content of antioxidants are very high. Therefore, if too exhausted body of free radicals, but will also increase the incidence of cancer risk. Only when the two are in an appropriate ratio exists in the human body, the body is healthy, blind change the content of a substance will have any adverse effects on the human body.
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