"Dad, why did you come with this oil again, and you said don't!" Xiao Shuai's father Lao Zhang came to visit his son from the countryside today, specially carrying a bucket of self-pressed oil, 25 kilograms of white plastic barrels filled with a bucket, looking at Xiao Shuai straight worried.
"Peanuts are all homegrown, and the oil squeezed out is natural and pollution-free, which is much better than the oil in your supermarket!" Lao Zhang heard Xiao Shuai's words and immediately pulled down his face.
"I told you last time that carcinogens were found in self-pressed oil, and the oil mill in my hometown was so dirty and unhygienic!" Xiao Shuai was a little helpless, the oil brought by Lao Zhang last time, he was still in a corner of the kitchen, and he did not dare to eat.
"We rural people have eaten self-pressed oil all our lives and have lived well, and no matter how dirty they are, they can't get the gutter oil in your city!"
……
Quarreling and quarreling, neither of these stubborn fathers and sons could convince anyone. Self-pressed oil is a hometown specialty of many people, some people like to use their hometown self-pressed oil, feel that the barrel oil in the supermarket is messy and unsafe, but with the news that more and more self-pressed oil has detected the first-class carcinogen aflatoxin, some people think that self-pressed oil will cause cancer.
Speaking of a thousand ways and ten thousand, rural people eat a lifetime of self-pressed oil is not healthy, will it cause cancer?
First, rural people eat a lifetime of self-pressed oil, and what is the difference between supermarket barrel oil?
The oil that you squeeze yourself is the oil that you use your own or purchased rapeseed, peanuts, soybeans and other oils to press with an oil press. In food technology, such freshly squeezed oil is called "crude oil", commonly known as "crude oil" or "coarse oil".
Supermarket barrel oil, is on the basis of "crude oil", the oil refining, generally including sedimentation, degumming, deacidification, dewaxing, decolorization, deodorization and other steps, it is best to put the refined grease into the barrel, packaged and sold.
Perhaps in everyone's eyes, such oil 0 added, more assured. However, small workshops generally have a simple oil extraction process, and the ability to prevent mildew and detoxification is relatively poor, especially in the warm and humid climate of the two Guangdong areas, peanuts, soybeans and other raw materials are very easy to breed aflatoxin, so small workshops and home-made bulk self-pressed oil found that aflatoxin exceeded the standard repeatedly.
Second, is rural self-pressed oil really natural and pollution-free?
Gao Jian, director of the Nutrition Department of Zhongshan Hospital affiliated to Fudan University, said: From the perspective of nutrition, although the nutrition retained by self-pressed oil is more, there are three health risks:
1, more oil smoke
Self-pressed oil retains more free fatty acids, pigments, phospholipids, proteins and more volatile constituents, impurities that make the oil smokey even in lower environments. Fumes are not only a source of PM2.5, but also carcinogens.
2, heavy metals are easy to exceed the standard
Home-squeezed crude oil, without multiple refining processes, can not remove harmful components in crude oil, it is likely that crude oil contains a large number of pesticides and heavy metal residues. Moreover, crude oil has too many impurities and is difficult to store, especially in the summer, it is prone to rancid deterioration.
3. Easy to mix carcinogens
If the oil raw material is mixed with moldy peanuts, corn, etc., it is likely that aflatoxin will be mixed into the oil. Aflatoxin, on the other hand, is a recognized strong carcinogen.
Third, what is aflatoxin that is often found in self-pressed oil?
The small partner who pays attention to Xiao Ai must be familiar with aflatoxin. It is a Class 1 carcinogen, that is, it has a clear carcinogenicity to the human body, while showing sufficient evidence of carcinogenicity in animal experiments.
Clinical studies have shown that aflatoxin in food is positively correlated with liver cell carcinogenesis. Acute toxicity is manifested by acute lesions such as necrosis of hepatic parenchymal cells, bile duct epithelial cell hyperplasia, hepatic fat infiltration, and hepatic bleeding. Clinical manifestations are fever, vomiting, anorexia, jaundice, and in severe cases, ascites, lower extremity puffiness, and soon lead to death.
The chronic toxicity of aflatoxin is manifested by growth disorders, subacute or chronic damage to the liver, destruction of liver tissue, and subsequent liver cancer. Aflatoxin is widely distributed and is often found in natural foods. Generally more common in cereals, beans, nuts, if moldy, or feel bitter when eating, remember not to eat.
Fourth, how to choose edible oil more assured?
Home cooking is almost inseparable from cooking oil, eat good oil, in order to ensure a healthy diet. So in life, how should we choose refined oils that can be safely eaten?
1, look at the production process, the first choice is pressing oil
The processing technology of edible oil is generally divided into two types: pressing and leaching. The pressing process is more costly than leaching, producing fewer harmful substances while retaining nutrients to the maximum. The cost of the leaching process is low, and it is easy to produce harmful substances when treated at high temperatures during the production process. Therefore, the first choice for purchasing pressed oil.
2, look at the grade of the oil, do not blindly require the higher the better
In the product [quality level] of edible oil, it is usually marked with level 1, level 2, level 3 and level 4. This gives consumers the idea that the higher the grade of oil, the better. In fact, the grade of edible oil is formulated according to the degree of refining, and the grade only indicates the degree of refining. Too much refining, less harmful ingredients, but also loss of nutrients. Therefore, it is not that the higher the grade, the better the oil.
3, look at the ingredient list, it is best not to contain cholesterol and sodium
The nutritional composition list will generally put the nutritional data contained in each 100g of edible oil public, here we focus on two sets of data: one group is the fat and vitamin E content, the higher the content of these two, indicating that the nutritional composition of the oil is good, the higher the quality; the other group is to see the cholesterol and sodium content, these two content must be 0, otherwise the quality is not ideal, it is not recommended to eat.
4, see the raw materials, whether they can accept genetically modified soybeans
The edible oil ingredient list mainly depends on whether it uses genetically modified raw materials. At present, the state stipulates that if genetically modified raw materials are used, they need to be labeled in the packaging of the product, and some people are reluctant to accept genetically modified products, so they can carefully check the packaging.
For self-pressed oil, occasional consumption is acceptable, but if it is long-term consumption, there is also a hazard, just imagine, if the self-pressed oil plant has poor environmental hygiene, raw materials have not been inspected, then the squeezed oil will contain a variety of impurities, may also be mixed with arsenic, mercury, residual pesticides and so on caused by environmental pollution, laying hidden dangers for safety.
Of course, the barreled oil in the supermarket is not 100% safe, but the production is restricted by national standards, if you do not comply with laws and regulations, the oil produced also has health risks. Do you usually eat self-pressed oil or barreled oil sold in supermarkets? After reading the article, which oil do you think is better?
[1] Self-pressed Oil: More Nutritious, Not Necessarily Safer. Popular Medicine.2015.01
[2] "1 mg carcinogenic, 20 mg fatal, aflatoxin is not afraid of boiling water!" 》. Journal of Home Medicine.2021-01-28
[3] "Popular Science | How to Choose Edible Oil, Teach You to Read and Choose a Good Oil with Labels". China Journal of Food and Drug Administration.2020-04-02
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