Peanut is rich in nutrition, sweet taste, eat a variety of ways, known as “longevity fruit”, is the people in the mind of the “omnipotent food”. But recent studies have suggested that eating peanuts for a long time may promote cancer metastasis, making many people wary of eating them again.
First, peanuts as an “accomplice” to cancer?
In fact, a 2014 study by Professor Lu Gang Yu of the University of Liverpool, published in the journal Cancer, found that peanuts contain a chemical that stimulates the spread of cancer cells in the body and increases their viability.
In the study, scientists found that a peanut protein called peanut agglutinin (PNA) is also present in precancerous and cancer cells. When PNA binds to a specific sugar chain, it interacts with a protein molecule on the surface of tumor cells in the blood, exposing potential adhesion molecules on the surface of tumor cells and causing cancer cells to become stickier and more likely to attach to blood vessels.
In addition, PNA can cause cancer cells to “clump together” and survive longer as they circulate through the body, making it more likely to spread to other organs.
In 2021, professor Yu lugang’s new study, published in Carcinogenesis, once again suggested that regular consumption of peanuts by cancer patients may increase the risk of tumor spread. Studies have shown that after entering the blood circulation, PNA will interact with vascular endothelial cells to produce cytokines, thereby promoting tumor cell metastasis.
But Yu said further research is needed to explore the impact of high peanut intake on cancer survival.
Two, still can eat? Don’t freak out
Peanuts have become the “accomplice” of cancer cell metastasis? Are these two studies a death sentence for peanuts?
Jiu Shu would like to say that such a conclusion is premature, for three reasons.
First, it’s just a “possible mechanism”.
PNA has the possibility of promoting cancer cell metastasis in theory, which is not equal to “eating peanuts can promote cancer metastasis”. At present, there is no clear evidence, direct or indirect, that peanut consumption increases cancer incidence and mortality.
Second, the study’s conclusions were based on two qualifications, one for cancer patients and the other for high consumption of peanuts, i.e., about 250 grams at a time. PNA increases only when these two conditions are met. There is no evidence for peanut consumption in healthy people or in low doses.
Finally, there are many researches related to “peanut anti-cancer”, which is contrary to the above views. Such as:
In 2020, Yin Huiyong’s research team from Shanghai Institute of Nutrition and Health, Chinese Academy of Sciences published a study showing that peanut red coat contains proanthocyanidin-B2, which has significant anti-tumor effects. Imperial College London has also found that peanuts are rich in folic acid and plant sterols, which can help prevent breast cancer, prostate cancer, colorectal cancer and other cancers when consumed in moderation every day.
Therefore, even if there are studies pointing out that “peanuts may promote cancer”, we can not easily come to the conclusion that “peanuts are harmful to human body”, “peanuts anti-cancer”, the same, to a rational view.
Three, these 2 kinds of peanuts eat less is better
Peanuts are rich in high-quality protein, unsaturated fatty acids, vitamins and other nutrients, and are inexpensive and good, so it is good to eat a little in moderation. But daily food also need to pay attention to the place, there are two kinds of peanuts to eat less.
The first is the bitter peanut.
Bitter peanuts, it is likely to have mildew, the breeding of large amounts of aflatoxin, the production of aflatoxin. Aflatoxins belong to a class of carcinogens, with strong toxicity and carcinogenicity, excessive one-time intake may lead to poisoning, long-term intake may lead to liver cancer. Therefore, eat bitter peanuts recommended immediately spit, and gargle with water.
The second is fried peanuts.
Fried peanuts are fragrant and crisp, and many people use them as snacks or drinks. But tips: the fat content of peanuts itself has reached 40%~50%, and the calories are higher after frying, which is easy to lead to excessive fat intake. In addition, after fried peanuts, nutritional value is destroyed, protein dehydration, eating too much is easy to dry mouth.
Four, eat peanuts, pay attention to, so eat more healthy
So, how to eat peanuts to be healthy?
In terms of cooking methods, it is recommended to choose boiling, braising or eating raw, which is convenient and simple, and can retain flavor and nutrition to the maximum extent. When stewed, peanuts can be added to dishes or staple foods, such as peanut spare ribs soup, peanut salty bone congee, peanut rice and so on.
It should be noted that no matter how delicious peanuts are, they should not be eaten too much. The Dietary Guidelines for Chinese residents suggest that adults should eat 50 to 70 grams of nuts a week, or about 10 grams a day, or about 15 peanuts. After eating peanuts, cut back on other high-oil foods to keep total calories under control.
In addition, not everyone is suitable for eating peanuts, gout, cholecystitis, diabetes, chronic stomach disease patients should not eat too much, infants and children had better not eat, so as not to choke into the trachea, accidents.