Is it true that the carcinogens in rapeseed oil exceed the standard? Reminder: 2 kinds of oils are best not to eat, or there is a risk of cancer
Recently, a company in Sichuan Province was fined 200,000 yuan for mixing and canning rapeseed oil that had been stored for nearly four years with other oils.
The Market Supervision and Administration Bureau of Nanchuan District, Chongqing City issued a notice on May 24, saying that the content of benzo(a) pyrene in rapeseed oil produced by a cooperative exceeds the national standard (according to the "GB2716-2005" Edible Vegetable Oil Hygiene Standard, The content of benzo(a) pyrene in rapeseed oil should be ≤10μg/kg.
Edible oil is an indispensable ingredient in life. The safety of edible oil has attracted much attention. Is it true that the carcinogens of rapeseed oil exceed the standard on the Internet? Blended oil, peanut oil, soybean oil...is there any oil that is the least healthy?
1. Is it true that the carcinogens of rapeseed oil exceed the standard?
Among edible vegetable oils, rapeseed oil is the only ingredient that contains campesterol, has the lowest saturated fat content, and is rich in lecithin, carotene, vitamin E and other nutrients.
However , traditional rapeseed oil contains a "dangerous molecule" - erucic acid . Excessive intake of this substance can easily lead to thickening of blood vessel walls and myocardial fat deposition. So some people say that rapeseed oil is unhealthy and even carcinogenic. Is this true?
In some animal experiments (short-term repeated dose toxicity experiments) such as rats, pigs, and monkeys, it was found that erucic acid can cause "myocardial lipid deposition" in animals. However, once the high-erucic acid diet was discontinued, this phenomenon could be alleviated or disappeared.
And it needs to be emphasized that animal experiments are not equivalent to human experiments , and the conclusions need to be treated differently.
Although cardiac lipid deposition similar to that observed in rat experiments has been observed in human cases, the main cause is not related to erucic acid, but more related to excessive intake of fatty acids, excessive synthesis of fatty acids in tissues or Fatty acid oxidation.
As for the statement "erucic acid causes cancer", dietitian Wang Silu said: Based on the existing evidence, there is not enough scientific basis to confirm that erucic acid causes cancer . Cancer is often a disease that occurs due to the combined action of multiple factors. Look rationally, don't wrong rapeseed oil.
And now there are also low erucic acid rapeseed oil on the market, which can be eaten with confidence.
2. Which oil is the worst oil? How to choose?
There are many kinds of oils, such as peanut oil, soybean oil, blended oil, corn oil... How should we choose?
1. Blend oil
Simply put, it is an edible oil prepared by mixing several oils in a certain proportion . It can be scientifically formulated to improve the nutritional value and performance of the oil. For ordinary people, it is a way to obtain a variety of fatty acids. convenient way.
2. Peanut oil
The proportion of various fatty acids in this type of edible oil is relatively balanced, and the aroma is strong. It is rich in nutrients such as vitamin E and carotene, and has good heat resistance, which is suitable for daily cooking. It contains less oleic acid than olive oil and tea seed oil, higher than soybean oil and sunflower oil, but lacks alpha-linolenic acid.
3. Soybean oil
It is mainly an edible oil extracted from soybeans. It is rich in lecithin, carotene, vitamin E, sterols and other nutrients. It belongs to "high linoleic acid type " oil. Inexpensive, with a high boiling point, suitable for frying food.
4. Corn oil
Mainly derived from corn germ, which has a high content of unsaturated fatty acids, mainly linoleic acid. Not only is it rich in vitamin E and essential fatty acids, but also rich in plant sterols , which can reduce the risk of heart disease.
5. Flax Oil (Flaxseed Oil)
It is rich in essential fatty acid-α-linolenic acid , which is helpful for the development of the brain and retina, and can also reduce the risk of death from coronary heart disease.
Since the iodine value reaches 175, it is easily oxidized and deteriorated by air, so it needs to be stored at low temperature and should not be heated when eating.
It can be seen that each edible oil has its own characteristics, and you can choose according to different cooking methods.
· Peanut oil, sunflower oil, corn oil, etc. for common cooking ;
· Extra virgin olive oil, soybean oil, linseed oil, wheat germ oil, etc. for cold salad ;
· Palm oil, coconut oil, butter, etc. for frying .
In short, each oil has its own characteristics, and without the premise of not excessive, there is no such thing as healthier and which is the worst. But from a health point of view, the use of oil should be avoided for a long time to avoid the lack of certain fatty acids in the body. It is best to use multiple oils alternately.
3. Reminder: Try not to eat these two oils
Some oils, if eaten, may indeed endanger the health of the body, such as these two, should be avoided as much as possible.
·Self-pressed oil / soil-pressed oil
Ground-pressed peanut oil, its raw material (peanut) is prone to problems, because the humid environment is extremely conducive to the growth of aflatoxin, and the peanut fruit is in direct contact with the soil. Therefore, if peanuts are not fully dried after harvesting, aflatoxin may unknowingly breed, which is a first-class carcinogen;
In addition, self-pressed peanut oil is mostly produced in small workshops, and there are often backward equipment and processes. Many impurities (such as free fatty acids, pigments, and even toxic heavy metals such as arsenic and mercury) have not been refined and removed. , is very detrimental to health.
In addition, in order to increase the oil yield, some workshops will raise the temperature to a particularly high level when frying seeds, which also increases the risk of the carcinogen benzopyrene. Therefore, for the sake of health, it is recommended that you eat less self-pressed oil.
·High temperature reused edible oil
Repeated use of fried cooking oil not only produces a large amount of trans fatty acids, which increases the risk of cardiovascular disease, but also may produce carcinogens such as acrylamide, heterocyclic amines, and benzopyrene, increasing the risk of cancer.
In addition to avoiding repeated frying with household oil, you should also eat less fried foods outside, which also poses health risks.
Summary: There are many types of edible oils. As long as they are qualified edible oils that meet the national standards, there is no one that is the best. The best way to eat them is to eat them in rotation. At the same time, try to avoid oil that may have potential health hazards, such as soil-pressed oil and high-temperature reused edible oil.
References:
[1] "The details of cooking oil determine health! Dietitian: Eating "rapeseed oil" is a good thing, but not indiscriminately". Nutritionist Wang Silu. 2020-06-15
[2] "Soybean oil, rapeseed oil, peanut oil, corn oil... Which of these 10 oils is better? Don't use it wrong again! ". Health Times. 2017-11-16
[3] "Oil rich in "carcinogenic toxins" must not be eaten by parents." Dr. Clove. 2021-09-06
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