Does Drinking Coffee Prevent Cancer?

Coffee is the second most consumed drink in the world, and more than 1.6 billion cups of coffee are consumed every day in the world. When it comes to tea, a lot of people immediately think of coffee.It is said that drink coffee each day can reduce the risk of some cancers,and the more you drink the more you earn,it is said that this ti because some oxides have anti-caucer effect.

Is coffee really so magical? In fact, the relationship between coffee and cancer are more complex than people think. Not only was coffee not considered anti-cancer, but it was thought to be carcinogenic. This is mainly because coffee contains a number of substances found in animal experiments that can cause cancer, such as acrylamide produced in coffee roasting, and is considered as a "human carcinogen". Coffee itself was also designated as a possible human carcinogen in 1991 by the WHO's International Agency for cancer research". We said before, the international agency for research on cancer based on the evidence and the strength of the carcinogen is divided into five categories: carcinogenic to 1 categories, probably carcinogenic to category 2A, possibly carcinogenic to category 2B, do not know will not cause cancer are classified into 3 categories, not carcinogenic to 4 class. Coffee was then classified as "2B", meaning limited evidence that it could be a human carcinogen.

This classification after all, countless people to create a great sensation, drink, involving huge commercial interests every day (for developing countries, coffee is the value after oil foreign trade product) a beverage classified as carcinogens sounds is somewhat controversial, so frightful to the ear, to have something else by the international agency for research on cancer classified as 2B class of carcinogens, people often take coffee is also classified as a class 2B carcinogen for example, is not what the big deal. The international agency for cancer research, which was then classified, was more cautious, and its complete assessment was: "limited evidence suggests that coffee drinking is carcinogenic to the bladder.". The evidence suggests that people who drink coffee are not carcinogenic to women's breasts and large intestine. There is insufficient evidence to suggest that people who drink coffee are carcinogenic to the pancreas, ovaries, and other parts of the body. There is no sufficient evidence that coffee can cause cancer in laboratory animals." The final conclusion is that coffee may be a carcinogen in the human bladder (class 2B)."

So at that time the international agency for cancer research classified coffee as "a possible human carcinogen". It was limited to bladder cancer. So on the basis of the assessment was 22 about coffee and bladder cancer epidemiology studies, 16 of which have found that drinking coffee and bladder cancer has a weak correlation, the remaining 6 could not be found to have correlation. Animal experiments did not show that coffee could cause cancer. Thus, the evidence for this classification is rather weak, which is why it is listed as a 2B class. The classification has also stimulated research into the relationship between coffee and cancer, and since 1991 there has been a surge of thousands of articles. The international agency for research on cancer again reviewed the possibility that coffee could cause cancer in 2016. The focus, of course, is on bladder cancer. But different studies have inconsistent findings, and some have found that coffee increases the risk of bladder cancer, and some have found no increase in bladder cancer risk. Several studies have found that drinking coffee can increase the risk of a man suffering from bladder cancer, but not increase or even reduce the risk of women suffering from bladder cancer, the gender difference shows that this risk may not lead to drink coffee, but a mixture of other factors, such as smoking or occupation factors. The international agency for research on cancer has now decided that these findings have coffee and bladder cancer associated factors, because there is no good to exclude smoking (many people often drink coffee, smoking) may be caused by smoking. So they vindicated the coffee and classified the coffee into 3 categories - not knowing whether it would cause cancer or not.

Of course, people aren't just concerned about bladder cancer. The relationship between coffee and various cancers are studied, if these studies seriously, the consequences of drinking coffee seems to different cancers are not the same, can increase the risk of some cancers, the risk of certain cancers, it Never mind for some cancer. Even for the same kind of cancer, the results of different studies are different. According to the international agency for research on cancer research argument, drinking coffee and lung cancer, colorectal cancer, gastric cancer, esophageal cancer, oral cancer, ovarian cancer, brain cancer, leukemia and other 20 kinds of cancer, although there are data, but the quality is not high, can not draw a conclusion. Much research has been done on coffee and breast cancer, pancreatic cancer and prostate cancer, but the results have not been found to be relevant. There are a number of studies found that drinking coffee on liver cancer, endometrial cancer, colorectal cancer and prostate cancer have a preventive effect, which is more evidence of obvious preventive effect on liver cancer and endometrial cancer, but with the amount of drinking, some researchers estimate every day to drink a cup of coffee can reduce the risk of liver cancer 15%.

But this epidemiological investigation of the relationship between eating habits and cancer is often crude, so it is hard to get the exact results, often conflicting. Even if it is agreed that coffee can reduce the risk of a cancer, it is difficult to understand the mechanism. Some evidence suggests that certain substances in coffee may increase body sensitivity to insulin and prevent chronic inflammation, which some believe is a cause of cancer. Some people believe that coffee can prevent cancer because its antioxidants protect DNA from damage. Some people think of a more special reason. For example, some studies have found that coffee consumption lowers the risk of colon cancer, but why? The possible reason is because coffee contains some anti-cancer substances, but it is also possible that coffee promote colonic motility, shorten the residence time of feces in the colon, it reduces the feces of carcinogens and colon tissue contact. It is also possible that coffee has altered the microbial makeup in the colon, and that some microbes may be involved in the development of cancer. But all these statements are merely hypotheses.

If you can't figure out the mechanism of action, it's hard to determine the effect of coffee on cancer prevention simply by investigating the risk of coffee and cancer. After all, correlation is not causation. According to current research, there is insufficient evidence that coffee drinking increases the risk of cancer and that people who like coffee can rest assured. But whether coffee can prevent some kind of cancer is still difficult to draw a clear conclusion. Even if future research confirms that coffee can prevent cancer, the preventive role is rather weak, and certainly not as good as quitting smoking, drinking less, eating a balanced diet, and strengthening exercise. Some studies believe that a day to drink 4~6 cups of coffee in order to have obvious anti-cancer effect, this amount is very high. Drinking too much coffee has a detrimental effect on the body, such as sleep and digestion. If you put coffee, sugar, cream, coffee mate, and more intake of calories and fat, if the weight increase, but increase the risk of cancer. If you don't drink coffee, you don't need to start drinking coffee for cancer prevention.