Is the traditional self-pressing oil in rural areas really unsafe? Possibly carcinogenic? CCTV experiment gives the answer

During Chinese New Year and festivals, Chinese people have the habit of visiting relatives and friends, and taking some gifts, such as fruits, cakes, etc., cooking oil is also a common gift. However, the market supervision department of Deqing County, Guangdong Province recently sampled 40 batches of peanut oil, and the results showed that 9 batches were unqualified, with a failure rate of 22.5%, all of which were produced by small workshops , which caused heated discussions among netizens.

---@Grandpa : My hometown harvests rapeseed by myself every year, cleans it, and sends it to oil extraction. After frying, it is fragrant. This kind of oil has been eaten by generations of people. We don't think the oil in the supermarket is fragrant .

---@flower crown grass : The oil made by yourself in the countryside is fragrant and delicious, and it is better than the oil bought in the supermarket. The rural areas have been eating self-extracted oil for thousands of years, and I have never heard of any oil that is not good, unsanitary and safe!

Is self-extracting oil really unsafe? Let's speak with data.

1. Why do experts say that self-extracting oil is not safe?

Previously, CCTV's "Focus Interview" column had exposed the quality problem of "earth-pressed peanut oil". After the experiment, the aflatoxin B1 of the earth-pressed peanut oil exceeded the standard by 100% !

Wang Qiang, a researcher and deputy director of the Agricultural Products Processing Institute of the Chinese Academy of Agricultural Sciences, pointed out that the reason for this is that on the one hand, the raw materials are contaminated and there is already a risk of cancer. Aspergillus flavus mainly originates from soil, especially soil in humid environment, and peanuts are in frequent contact with soil and have high moisture content, which is easy to be polluted and moldy.

What's more, aflatoxin is highly toxic and belongs to a class of carcinogens . It is not only carcinogenic, but also has strong teratogenic and mutagenic effects. The half-lethal dose is 0.36 mg/kg body weight. Long-term intake of aflatoxin can damage the liver, leading to hepatitis, cirrhosis, and even liver cancer.

On the other hand, earth-pressed peanut oil has not been refined and processed, so it contains many impurities and is prone to oxidative deterioration. Edible oil refining is to carry out operations such as degumming, deacidification, decolorization, and deodorization, which can remove toxic substances such as aflatoxins.

In addition, there are also food safety issues such as fake and shoddy adulteration, added flavor, lack of supervisory inspection, and multiple pollution in soil extraction. From these aspects, modern industrial refined oil is actually safer .

2. To reduce the harm of self-extracting oil, pay attention to 3 points in advance

However, people who like to eat self-extracted oil have their own reasons. Some people say that the taste is more fragrant, while others are because they have raw materials at home. If you want to stick to self-extracted oil, you must at least learn how to reduce the harm.

1. Ensure the safety of raw materials

To eliminate Aspergillus flavus from the source, it is necessary to ensure the safety of raw materials, and learn to choose peanuts, sesame seeds, soybeans, etc., mainly by looking, smelling and tasting. It is best to choose fresh raw materials that are more hygienic for storage and handling.

2, do not eat for a long time

Self-pressed oil can be used occasionally, but long-term consumption is not recommended. The nutritional value of edible oil mainly lies in the types of fatty acids, the proportion of fatty acids, the content of fat-soluble vitamins and essential fatty acids such as linoleic acid and linolenic acid . Can be used alternately with different refined oils.

3. Store carefully and eat as soon as possible

During the production process of self-pressed oil, impurities are difficult to remove, and it is relatively turbid, which will affect the taste and flavor. In addition, in the process of self-pressing oil, due to the substandard production environment and sanitary conditions, it is prone to microbial contamination. In addition, vegetable oils such as peanut oil, soybean oil, and sesame oil have high unsaturated fatty acid content, which is easy to oxidize and deteriorate . It cannot be stored for a long time.

Therefore, the self-pressed oil should be kept in a closed, cool and dry place, and should not be stored for too long. It is best to consume it within one month.

In general, self-pressed oil can be eaten, but not often. Although we can reduce the harm through some measures, the possibility of poisoning cannot be ruled out. There are similar news every year.

3. About edible oil, you also need to know these

·The oil has tasted bad, can I still eat it?

Cooking oil will change its taste after being stored for a long time. The specific manifestation is that there is a lot of oil smoke when cooking, and the fried dishes have an odor. This is mainly because oxygen, sunlight, etc. oxidize and deteriorate the oil, producing acids, aldehydes and other substances, which not only make the oil taste wrong, but also harmful to the human body after eating. If you find that the oil has changed taste, be sure not to eat it!

· Which oil is healthier?

There are many types of edible oils, which oil is healthier for the human body?

In fact, different types of edible oils have different nutrients. If you want to eat healthy, the most important thing is not to consume too much or the same oil for a long time. Studies have shown that vegetable oils high in unsaturated fatty acids are healthier than animal oils high in saturated fatty acids.

In addition to not excessive and variety, it is also important to use appropriate cooking methods , try to cook and stew, and reduce frying.

· How much oil is better to eat every day?

It is recommended that Chinese residents should consume 25-35 grams of cooking oil per day, which is about two and a half tablespoons.

After reading this article, will you still have a soft spot for self-extracting oil? The flavor of self-pressed oil is unique, but the health risks are also great. If you really like to eat it, you can taste it occasionally. It is not recommended to eat it for a long time, so as to avoid health risks.

References:

[1] Xue Bin, Cao Wenming. Although it seems safe and secure, it is actually not advisable for families to squeeze oil by themselves [J]. Food and Life, 2016(2):2.

[2] Ji Wanlan, Yang Yabing. The relationship between edible oil and human health [J]. Food Safety Guide, 2013(9):3.

[3] Ruan Guangfeng. Whether the more "earth" the oil is, the healthier it is [J]. Family Medicine: the first half of the month, 2016.

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