What to eat can prevent cancer? In recent years, as more and more people are concerned about anti-cancer foods, from whole grains, vegetables and fruits to delicacies, from time to time be exposed foods found to contain some kind of "anti-cancer ingredients", which became widely known anticancer smash hit " star food. " However, these claims contain "anti-cancer ingredients" of "anti-cancer food" really can play a role in cancer prevention it? Diet and cancer is really about?
Subsidiary of Shanghai University of Traditional Chinese Medicine Hospital , director of oncology Professor Li Yan told reporters that 50% of the tumor may be related to dietary factors, particularly in tumors of various types of esophageal cancer , stomach cancer , liver cancer , colorectal cancer and other gastrointestinal cancers. He believes that some foods do have a certain anti-cancer effect, but a poor diet can even damage the digestive system, the incidence of cancer is also associated with excessive eating. So, from the perspective of anti-cancer diet, "how to eat" is more important than "what to eat", particularly dietary protein content is too low, too high are carcinogenic, so learn how to "scientifically eat", so that a balanced diet than to focus on "what to eat" would be more effective to prevent cancer.
Tumor will "burn out"
Li Yan pointed out, cancer and genetic-related real little, mainly by environmental factors, including diet-induced. This is 80% of cancers associated with poor living habits, 50% of cancers and dietary factors, especially esophageal cancer, stomach cancer, liver cancer, colorectal cancer and other gastrointestinal cancers. He explained that Japan is a big country of gastric cancer, there were scholars to investigate hereditary stomach cancer and has done an interesting medical research, the researchers organized a group of identical twins, will be divided into two groups living in Japan and the United States. The results showed that patients in the group of twins living in Japan is much higher than the proportion of cancer in American life that group, indicating that even genetically identical, but due to different postnatal diet, living habits, the proportion of cancer are clearly not the same . Therefore, the "what to eat" and "how to eat" For the incidence of cancer has important links.
Li Yan said the same temperature water, drink it may not feel hot, but if able to feel with your fingers touching hot. Often eat hot food, especially for people who are at very high temperature conditions do not feel hot, but more afraid of hot, will eat more hot, so the formation of a poor diet.
It is understood that the human oral mucosa, esophagus and gastric mucosa are very delicate and can only tolerate food 50 ℃ to 60 ℃, and the food is too hot temperature around 70 ℃ to 80 ℃, so it is likely to cause mouth and digestive tract burns. And like cancer, cardiac, oral cancer are associated with hot food related.
"For example, China's Xinjiang Kazakhs living areas like drinking hot tea; southeast coast Chaoshan area like drinking" Gongfu "; bowl of hot porridge Taihang Mountain area is also only eat these areas are well-known high incidence of esophageal cancer.." Li Yan said. In addition, the diet is not only likely to cause overheating tumor, and digestion and absorption of food is also unfavorable. As the food is too hot, there is a time shorter in the mouth, chewed and mixed with saliva secretion stimulated processes are not sufficient, is not conducive to digestion and absorption of food. The fiery stimulation often masks the taste of the full experience, most only a single taste formed at high temperatures, over time, tend to eat other foods not fragrant, food will be more simple.
In addition, smoked and preserved foods also contain large amounts of nitrosamines, some digestive system tumors, such as the number of nitrosamines incidence of esophageal cancer associated with dietary intake. The French fries and other fried starchy foods in a large number of propylene amine component, may also lead to gene mutation, and may even cause cancer.
Li Yan once had such a contact with the patient in Ningbo, a total of four siblings of patients, however, three of which have suffered from esophageal cancer , liver cancer and colon cancer, after understanding the patient's parents are suffering from stomach cancer. Li Yan analysis of the Road "generally like to eat what parents and children will like what to eat, and eat pickled Ningbo comparison, fried food, which is increasingly common in many of the current" relative cancer "has some relevance." He said that when cancer among relatives if someone could prompt the family susceptibility genes exist, however, between relatives lifestyle, eating habits, living environment is also fairly close contact with the same chance of higher carcinogenic factors.
Long-term overeat increased risk of cancer
Today, the streets of tempting dishes too much popularity, or pan-fried or deep-fried or smoked or roasted ...... for the majority of food goods are concerned, how can we eat stays fun? However, that Li Yan, tumor incidence, and even cancer mortality, but also a great number of eating and contact - more total body calorie intake, such as colon cancer , rectal cancer, gallbladder cancer, bile duct, breast , cervical, ovarian cancer, endometrial cancer incidence rate is also higher.
Li Yan, in general, about the intake of 2200-2700 kcal per person per day. But once daily calorie intake from 2700 kcal to 3900 kcal, is what we usually call "eat up", colon and colorectal cancer incidence and mortality can therefore be increased by more than double. In the area of high-calorie diet, female breast cancer incidence rate is 1.2 times the low calorie diet region. The study also found that eating animals and freedom compared to those animals restrict their food intake low incidence of spontaneous tumors and longer life.
Li Yan said that the relationship between protein and tumorigenesis is more complex. "When the content is too low dietary protein can promote tumorigenesis, or increase the amount of dietary protein intake of certain amino acids, can inhibit tumor growth, but when the intake of protein from normal human mass demand for 2 to 3 times, was able to induce tumor-enhanced chemical substances. "
In this one, the impact of animal protein and vegetable protein on the tumor also have significant differences. It is understood that more animal protein, breast cancer, colon cancer, colorectal cancer, prostate cancer, the greater the risk of pancreatic cancer, but legumes protein can inhibit tumorigenesis. So in protein intake, Li Yan proposed scientific selection, usually supply the amount of protein per person per day should be appropriate to 70g-80g, which soy protein should be 20%.
Ideal diet food = 80% +20% acid alkaline food
Li Yan pointed out, know how to eat and what to eat, can greatly reduce the incidence of cancer, especially for esophageal cancer, stomach cancer, liver cancer and colorectal cancer and other gastrointestinal cancers, can be reduced by about 40% to 60% incidence. He said that the so-called know how to eat, is to develop good, healthy eating habits. According to reports, the American Institute for Cancer Research has recalled more than 4500 copies of Cancer Research, sorting out the report calls for people to prevent cancer is not difficult, as long as do not smoke, eat right, sustained physical activity, combined with maintaining an appropriate weight, you can reduce 60-70 % chance of cancer.
The so-called know what to eat, is the need to know what food has the effect of preventing the occurrence of cancer, and regular consumption, such as green leafy vegetables, carrots, potatoes and citrus fruits have strong anti-cancer effect. Studies have shown that more than two a week to eat green leafy broccoli men, compared to less than a week to eat a person's chances of suffering from bladder cancer by 44% lower. The daily intake of at least five fruits and vegetables can reduce the risk of cancer by 20%.
"In addition, the public should know which foods are likely to cause cancer occurs." Li Yan said. It is understood, professor of pharmacology at Nihon University study found that normal people eat high carbohydrate foods, because their immune dysfunction, 4-5 times higher chance of developing cancer than the average person. The reason is that all the sugar is calcium acidic foods, excessive intake of calcium is bound and human conflict, so that the body appears neutral or acidic environment, the human immune system can also fall, will take advantage of a variety of carcinogen , and long-term intake of high sugar foods easily lead to tumors.
LI Yan believes that the acid-base balance in the body is closely related to the health of the body, cancer diseases, and most preferred are acidic PH value and the low, but the recovery of the body generally in the PH value of the alkaline cells (about 7.3 -7.4) when started. So how can the body often remain "pH balanced" state? Li Yan pointed out that mainly rely on diet to regulate, the ideal diet should be "80% plus 20% alkaline foods acidic foods", such as the proportion of the diet either maintain normal body weight and strength, and may prevent disease. Generally, vegetables, fruits and other plant foods alkaline foods, meat, dairy and other animal fat foods acidic foods. He stressed that the eating habits and food are two types of the human diet, and tumorigenesis is closely associated, such as eat vegetables can prevent cancer, but the vegetables cooked, at room temperature for a long time, you can make nitrite nitrite amine salt into a carcinogenic effect, but can promote tumorigenesis, therefore, needs to be emphasized is required to understand how science diet.