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Recently, coworker c was pregnant and was beginning to be particularly cautious about all kinds of food。
She used to bring meals from her home and heat them up in the microwave at noon. Since she was pregnant, she had never brought it again because she feared that the microwave would be radioactive and bad for her children。
And her colleague said, "the microwave is radioactive, it's not working, it's not good for the kids. It's cancer for a long time."
On the internet, it has been said that radiation from microwave heating can cause cancer and can cause a significant loss of food and nutrition ... This is of great concern to colleagues。
Is the microwave working? Is it dangerous to heat up the microwave? Today we talk about the microwave。
01
How does the microwave heat up food
How does the microwave heat food when there is no fire
In fact, the microwave works by converting electric energy into microwaves, whose own energy allows polar molecules in foods to vibrate at high speed with changes in the exchange field, generating huge amounts of heat, thus heating the food. The most common polar molecule in food is moisture. Once the food absorbs microwave energy, the water molecules in the food generate thermal energy as the exchange field moves at high speed。
This is why the composition of the food also affects the heating of microwaves. Generally, foods with high moisture content are heating faster. The more ions in the food, the faster the heating。
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02
There's radiation in the microwave
Microwave is, in the impression of many, a radiation, so pregnant women are not able to use it。
In fact, it's totally disturbing。
Microwave is an electromagnetic wave, which is essentially the same as radio, telegraphic, infrared and normal light. But the radiation that we often worry about -- the x-rays are very different, mainly because of their frequency。
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Microwaves are electromagnetic waves with frequencies of between 3 and 300,000 mhz (one million weeks per second). Microwave is also an electromagnetic wave, radiation, but it's quite different from the x-ray that everyone fears. X-ray is a powerful radiomagnetic wave, which is too high in frequency and energy over microwaves, and radioisotopes can emit particles during decay, so they can cause cancer in organisms。
Microwave is a low-frequency electromagnetic wave and does not pose a danger to humans。
In addition, the microwave's metal casings are well shielded, the microwave's doors are closed when heating, and there are very few microwaves that actually leak through the door, which is equivalent to the amount of radiation from a 10 watt-day light。
Thus, pregnant women can also use the microwave。
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03
Microwave heating can cause cancer
As for the cancer caused by microwave-heated food, there was also no justification。
It is inevitable that during the heating process, some harmful substances, such as benzothylene, fat oxides, etc., are produced. However, microwave heating can increase the number of harmful substances。
Studies comparing the effects of several commonly used cooking methods on lamb and beef show that microwave heating of lamb and beef does not produce more carcinogenic substances. Microwave-heated food was also studied to feed rats, and it was found that microwave foods were not harmful to rats as compared to common cooking。
Moreover, microwaves are food heated by electromagnetic waves, without open fire, and often at lower temperatures than traditional cooking methods (bracketing), producing fewer harmful substances。
For example, carcinogenic substances are easily produced in meat during heating. Studies comparing several methods of cooking chicken legs have found that the least acreamine is produced by microwaved chicken legs. A study of beef cakes also found that pre-treated steaks with microwaves produced relatively little acreamine。
In fact, it is crucial whether the heating of food produces carcinogens or not that the heating temperature and time be considered safe to eat as long as the temperature is right。
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04
Can microwave heat food lose nutrition
There are also many fears that microwave heating can lead to nutrient loss and loss. Indeed, that fear is superfluous。
The main types of nutrition provided by food are proteins, carbohydrates, fats, vitamins and minerals. During the heating process, only vitamins, especially vitamin c, b vitamins, are more likely to heat. However, scientists have found that microwave heating has less impact on vitamins than normal heating. Because it's still a little lower than the burning fire。
Current research shows that microwave cooking, both in terms of nutritional value and food safety, is no different from our traditional way of cooking. So the microwave can still be used。
