Fries, skewers, potato chips, fried chicken, crispy and tempting fried foods can often attract the attention of food lovers, but I wonder if you have ever thought about the risks posed by these delicacies? In daily cooking, in order to save, many families will continue to heat and reuse the oil that has been fried. In order to save costs, the restaurant outside will repeatedly use the same pot of cooking oil, which brings hidden dangers to our health. So can the oil that has been fried be used repeatedly? Is it carcinogenic?
Scientists at the University of Illinois (Urbana-Champaign) led a related study in 2019. The scientists conducted a controlled experiment with two groups of mice, allowing them to ingest fresh soybean oil and repeatedly heated "back to the pot oil" respectively. Four months later, the researchers injected advanced breast cancer cells into mice. After 20 days, it was found that the mice that had long-term intake of "back pot oil" had 4 times the primary tumor at the injection site than the control group! And it's more prone to transfer.
Based on this, the researchers proposed their hypothesis: that the oil that is repeatedly heated at high temperatures will break the triglycerides in it and oxidize the free fatty acids, causing the acrolein levels in it to rise sharply.
Despite the limitations of this study, we need to be very cautious about the use of edible oils.
<h1 class="pgc-h-arrow-right" Data-track="2" What are the health risks > repeated heating of cooking oil? </h1>
First of all, after repeated high-temperature heating, the fat-soluble vitamin A and carotene in the edible oil will be destroyed. Unsaturated fatty acids also produce thermal oxidation reactions that form peroxides that prevent the body from absorbing nutrients.
Secondly, repeated high temperatures will also produce a large number of free radicals, trans fatty acids and tri-tetraphenylpropylpide and other substances, which have certain carcinogenicity, especially fried fried foods, which produce more active carcinogens.
In addition, after repeated heating of edible oil, unsaturated fatty acids will also polymerize, forming indigestible or toxic polymers, such as dimers, trimers or polymers, etc. After excessive consumption of the human body, it will lead to liver function damage, growth and development delay or stagnation, and decreased fertility function.
<h1 class="pgc-h-arrow-right" data-track="37" > 4 precautions about edible oil</h1>
If you want to avoid harm to human health, you should pay attention to the following items when using cooking oil in daily life.
1. After the cooking oil is opened, it is best to eat it within three months, otherwise the oil may be sour and deteriorated, endangering the health of the body.
2. Vegetable oil and animal oil are alternately eaten, mostly vegetable oil. When cooking, the type of oil is selected according to the balance of heat resistance and fatty acids. Animal oil is resistant to high temperatures, more suitable for frying and stir-frying, and vegetable oil is more suitable for stewing, stir-frying, and cold mixing.
3, home storage is exquisite. In order to delay the rancidity and oxidation of the oil, the storage temperature of the oil is better than 10-15 ° C, away from the stove, it is best to store in a low temperature backlit, dry and ventilated place. Oil storage container is best to choose a glass bottle with good oxygen insulation function, and close the cap in time after use. If the oil is bottled in separates, do not mix the old and new oils, and the bottles should be cleaned regularly.
4, the selection of edible oil is also exquisite. It is recommended to buy products produced by regular manufacturers and avoid buying small workshop products without safety guarantees. Products made from non-GMO raw materials are preferred for physical pressing process products.
<h1 class="pgc-h-arrow-right" data-track="39" > reminder: Heavy oil diet is harmful to the body</h1>
According to the nutrition and health monitoring data of Chinese residents, the average daily intake of edible oil by Chinese residents is 41.8 grams, including 37.1 grams of vegetable oil and 4.7 grams of animal oil, which is significantly higher than the recommended amount of 25 to 30 grams. The heavy oil diet will bring a heavy burden to the body, such as accelerating obesity, reducing human metabolism, causing diabetes, dyslipidemia, atherosclerosis and coronary heart disease.
So how to consume oil is healthy? The National Health Commission has made the following recommendations:
Adults consume edible oil within 25g per day;
Use graduated oil control bottles to control the dosage;
Eat less fried foods, such as fries, biscuits, fried chicken, etc.;
Mostly use stewing, stewing, boiling, steaming, cold mixing and other cooking methods;
When shopping for food, choose products with low oil and fat content.
In short, in our daily cooking, we try not to repeatedly heat the use of cooking oil to avoid the burden it causes to the body. In addition, we must also store edible oil reasonably, avoid heavy oil diet, and let oil become our "health partner" rather than "health killer". #Breeze Project##Rumor Zero Plan ##健康热力计划 #
Resources:
[1] New study: Repeated use of cooking oils raises risk of cancer metastasis. Nutshell. 2019-03-25
[2] Which is the best edible oil? Can I eat only one for a long time? It turns out that all these years have been wrong...". Popular Science China. 2020-10-10
[3 "Cooking oil has a "golden matching method"!] The Health Commission gives you 10 "oil reduction" suggestions. Life Times. 2020-11-11
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