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Disputes on dietary fiber and its effect on colon cancer, which are conducted over the past 25 years, for the most part began with Burkitt's work in Africa.
Due to popularity and authority Burkitt many believe that fiber helps maintain the health of the colon and rectum. At least, you have probably heard that fiber helps digestion. This is what is known prunes, is not it?

However, no one could ever prove that fiber is a miracle cure for the prevention of colorectal cancer. There are good reasons Technical characterized Tera, which is difficult to make an accurate conclusion about the role of dietary fiber. Each of these at-rank directly or indirectly related to the fact that dietary fiber is not only a simple substance, which gives only a positive effect. Cellulose consists of hundreds of substances and positive effects of its use are achieved through a complex series of biochemical and physiological processes. Whenever scientists assayed consumption of food fiber, they have to decide which of the hundreds of its sub-fractions was analyzed and what methods are used at the same time. It is almost impossible to develop a standard for this procedure, as is almost impossible to know exactly how each of these sub-fractions active in the body.
The absence of a standard procedure and the associated uncertainty have become cause of the fact that in the course of "The China Study", we analyzed the effect of fiber on the body for more than a dozen ways. As briefly described in Chapter 4,
as the growth in consumption of almost all varieties of fiber there was a decrease in the incidence of colorectal cancer. But we could not do chetkogovyvoda what kinds of fiber had the greatest znachenie.Nesmotrya this uncertainty, I continue to believe that the hypothesis Burkitt, according to which food containing fiber, helps prevent colorectal cancer, is correct and that this effect is partly due to the combined effects of all types fiber. This hypothesis was confirmed in the future. In 1990, a group of scientists reviewed 60 studies that examined the relationship of fiber and colon cancer. It turned out that most of the studies confirmed the idea of ​​the important role of dietary fiber in the prevention of colon cancer. As noted
in the review, when comparing the results it is evident that those who consumed the most fiber, the risk of developing colon cancer was 43% lower than those who consumed it less often. People who ate the most vegetables, the risk of the disease was 52% lower than that eats the least vegetables. But even in this large-scale survey of a large amount of scientific evidence, scientists have noted that "the available evidence does not allow us to separate the effects of eating vegetables, associated with the fiber, the effect is not associated" So whether the fiber itself is a magical tool that we are looking for? In 1990, we do not yet know.
Two years later, in 1992, another group of scientists reviewed the work, which compared people who suffer and do not suffer from colorectal cancer (the method of "case-control"). They found that those who consumed the most fiber, the risk of developing colorectal cancer was 47% lower than those who consumed the least fiber.
If you remember, 13 grams of fiber - a cup of any variety of beans. Later, in the course of an extremely large study known as "Jewish Mutual prospective study of the relationship of cancer and nutrition", or EPIC (European Prospective Investigation into Cancer and Nutrition), data were collected on the consumption of dietary fiber and colorectal cancer among 519,000 people across Europe. < br> It was found that 20% of people who consume more fiber of about 34 grams per day, were at risk of developing colorectal cancer at 42% less than 20%, which consume less fiber, about 13 grams per day. It is important to note again that, as in other similar studies, cellulose ingested as food, and not as a food additive. Therefore, all we can say - "food containing fiber", apparently contributes to a significant reduction in the risk of colorectal cancer. We still can not draw any definite conclusions about the impact of the actual fiber. This means that the addition of a separate food fiber may not produce the desired result. However, the use of plant foods rich in fiber from nature obviously useful. Such foods include vegetables (not root vegetables), fruits and whole grains.
We can not even know for certain the extent to which the prevention of colorectal cancer is caused by food containing fiber, as is usually the extent that, as people eat more of the food they consume less animal foods. In other words, if we protect fruits, vegetables and whole grains, meat or ruining? Or rather both? Answering these questions helps you find a study conducted in South Africa. In white South Africans colon cancer occurs 17 times more frequently than in blacks, and at first thought that this is due to a much higher intake of dietary fiber, the latest in a crude maize. But in recent years, black South Africans are increasingly eating foods from refined maize, purified
from the fiber. Now in their diet less fiber than their white compatriots. Meanwhile, the incidence of colon cancer among black South Africans has remained at a low level, which makes us think about how much of the prevention
matic effect on colorectal cancer is due solely dietary fiber. Later in time issledovanie76 showed that more frequent incidence of colorectal cancer among white South Africans may also be due to a high content in their food of animal proteins as compared with black nationals (77 and 25 grams per day), fat (115 and 71 g per day) and cholesterol (408 and 211 mg per day) as
It is shown in Fig. 8.4. Scientists have suggested that the high incidence of colorectal cancer among the white population of South Africa, possibly related to the amount of animal protein and fat in their diet rather than to insufficient preventive effect of dietary fiber.
The consumption of animal protein, fat and cholesterol white and black South Africans. Anyway, it is evident that the natural diet high in dietary fiber and low in animal products can prevent colorectal cancer. Even in the absence of more specific details we can still formulate important recommendations in the field of public health. The data clearly show that the integral power plant products mozhetznachitelno reduce the incidence of colorectal cancer. We do not necessarily know what types of fat cause this effect, what is the mechanism of its influence, and even the extent to which such an effect is due to fiber itself.