In fact, as early as 20 14, a study published by Professor Yu Lugang of the University of Liverpool in the United Kingdom in Cancer magazine pointed out that peanut contains a component that can stimulate the spread of cancer cells in the body and improve the viability of cancer cells.
In the research, scientists found that a protein called peanut agglutinin (PNA) in peanuts also exists in precancerous stage and cancer cells. When PNA binds to a specific sugar chain, it will interact with a protein molecule on the surface of tumor cells in blood, exposing the potential adhesion molecules on the surface of tumor cells, resulting in higher viscosity of cancer cells and easier attachment to blood vessels.
In addition, PNA can also make cancer cells "cluster", survive longer in the process of internal circulation, and have a greater probability of spreading to other organs.
In 20021year, Professor Yu Lugang's new research published in Carcinogenesis once again pointed out that cancer patients often eat peanuts, which may increase the risk of tumor spread. Studies have proved that PNA will interact with vascular endothelial cells after entering the blood circulation to produce cytokines, thus promoting tumor cell metastasis.
However, Professor Yu Lugang also said that further research is needed in the future to explore the effect of large intake of peanuts on tumor survival rate.
Peanut has become an "accomplice" in cancer cell metastasis? With these two studies, can peanuts be sentenced to death?
Jiu Shu wants to say that this conclusion is premature for three reasons.
First of all, this is just a "possible mechanism".
PNA can theoretically promote the metastasis of cancer cells, but it does not mean that eating peanuts can promote the metastasis of cancer. At present, there is no clear evidence that eating peanuts will increase the incidence and mortality of cancer, whether it is direct or indirect evidence.
Secondly, the research conclusion is based on two limited conditions, one is cancer patients, and the other is eating a lot of peanuts, that is, eating about 250 grams at a time. Only when these two conditions are met will PNA increase. If it is a healthy person or a low-dose peanut, there is no relevant evidence to support it.
Finally, there are many studies related to "peanut anti-cancer", which are contrary to the above viewpoint. For example:
In 2020, a study published by Yin Huiyong, Shanghai Institute of Nutrition and Health, Chinese Academy of Sciences, pointed out that peanut red contains proanthocyanidins-B2, which has a significant anti-tumor effect; Imperial College London, London also found that peanuts are rich in folic acid and phytosterols, which can help prevent cancers such as breast cancer, prostate cancer and colorectal cancer if eaten in moderation every day.
Therefore, even if some research points out that "peanuts may cause cancer", it is not easy to conclude that "peanuts are harmful to human body", and "peanuts are anti-cancer" is the same, so we should treat them rationally.
Peanut is rich in high-quality protein, unsaturated fatty acids, vitamins and other nutrients, and the price is cheap, just eat a little. However, daily consumption also needs attention. There are two kinds of peanuts to eat less.
The first kind is bitter peanuts.
Bitter peanuts are likely to be mildewed, breeding a large number of Aspergillus flavus and producing aflatoxin. Aflatoxin is a carcinogen, which is highly toxic and carcinogenic. Excessive intake may lead to poisoning, and long-term intake may lead to liver cancer. Therefore, it is suggested to spit out bitter peanuts immediately and rinse your mouth with clear water.
The second kind is fried peanuts.
Fried peanuts are crispy and delicious, and many people regard them as snacks or snacks. But do you know that the oil content of peanuts has reached 40%~50%, and the calories after frying are higher, which easily leads to excessive fat intake. In addition, after peanut frying, the nutritional value is destroyed, and protein is dehydrated, which makes him thirsty if he eats too much.
So, how to eat peanuts is healthy?
In terms of cooking methods, it is recommended to choose boiling, stewing or raw food, which is convenient and simple, and retains the flavor and nutrition to the maximum extent. When stewing, peanuts can be added to dishes or staple foods, such as peanut sparerib soup, peanut salty bone porridge, peanut miscellaneous grains rice and so on.
It should be noted that no matter how delicious peanuts are, you can't eat too much. Dietary Guidelines for China Residents suggest that adults should consume 50-70g of nuts every week, with an average of about 65,438+00g per day, or about 65,438+05 peanuts. After eating peanuts, you should reduce the intake of other high-oil foods to keep the total calories from exceeding the standard.
Besides, peanuts are not suitable for everyone. Patients with gout, cholecystitis, diabetes and chronic stomach diseases should not eat too much, and infants should not eat too much to avoid choking into the trachea and accidents.
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