Liu Yiwei endorsed a "smart food purification machine" and made a very lively marketing program on a satellite TV, claiming that it could "clean up all the pesticides, fertilizers, antibiotics, ripening agents, microorganisms, bacteria, and parasites".
The presentation of the show is very old-fashioned, but it is still quite wonderful - "wonderful" is just good-looking, strong ability to flicker, and "reliable" is completely incompatible.
The "disgusting" blood of meat ingredients is a stealing concept
First, a big aunt "thought she washed clean" ingredients into the purifier, and after processing, "disgusting" water was produced.
Liu Yiwei explained that in addition to blood water, this "disgusting water" also contains "inorganic substances, antibiotics, animal hormones, bacteria and other harmful substances." So the audience exclaimed: the original ingredients are so dirty, and the food purifier really "washes out all the dirty things."
But this is a stealing operation.
There is some blood in the meat ingredients, which contains a certain amount of fat and protein. From the TV, the "food purifier" is a device with a high-speed rotation function (in addition to functions such as ultrasound). Under high-speed rotation (and ultrasound), the blood will be "thrown" out, and it will become a "disgusting" looking blood water. These "disgusting" waters have nothing to do with "inorganic substances, antibiotics, animal hormones, bacteria", etc. - no matter how high-quality and reliable meat ingredients are, put in and treated like this, you will get this basin of "disgusting" water.
Liu Yiwei interpreted this as removing "inorganic substances, antibiotics, animal hormones, bacteria and other harmful substances." The "inorganic substances" in the ingredients are various minerals, which are nutrients, and if they are really removed, the nutritional value of the food is greatly reduced. In addition, if there are really "antibiotics and animal hormones", their presence in the ingredients is similar to that of nutrients such as vitamins. Is it possible for an ingredient purifier to identify which nutrients need to be retained and which harmful substances need to be removed?
Nonsense about broccoli
In various demonstrations of fruit and vegetable cleaning, broccoli is always pulled out as props.
The surface of broccoli is impermeable because there is a natural layer of wax on the surface. This is the same as the "wax" on the surface of lotus leaves, taro leaves, and fruits such as apples and pears. Because of this layer of wax and the special structure of the uneven and tightly arranged surface of broccoli, water cannot pass through broccoli, and it looks like there is a layer of "film" on the surface.
And Liu Yiwei interpreted this layer of "film" as "solidified substance formed by pesticide residues", which is completely open-ended. In fact, just think about it a little: the pesticide is mainly water, if the film is really formed by the "solidification" of the pesticide, then how many pesticides must be sprayed? Pesticides are also quite expensive, sprayed with so many pesticide broccoli, what kind of price do you have to sell farmers will not lose money?
The "cleaning effect" shown on tv is actually that under the high-speed shear force, the special structure on the surface of broccoli is destroyed, and the water can soak the broccoli, which looks "verdant".
This phenomenon has nothing to do with the removal of pesticide residues.
In addition to this "food purifier", there are also various detergents and cleaning equipment on the market, and often based on this principle, broccoli is used to engage in "blindfolding".
The "scientific principle" that makes people unconscious
In the program, the principle of this "food purifier" was also mentioned, which is "high-energy electron beam radio frequency bombarding water molecules to generate highly active hydroxyl group".
"High-energy electron beams" are used in many applications in scientific research, medicine and industrial processing, and it is completely okay to "bombard water molecules". Theoretically, after "bombardment", a part of the water may be negatively charged and become a "reactive oxygen species" (or "oxygen free radical").
If this "food purifier" is indeed based on the principle described in the program, then it is also relying on the "strong oxidation" of oxygen free radicals to achieve "purification". This principle is similar to that of "ozone cleaning machine".
If you treat certain substances with reactive oxygen species, you can indeed degrade them. Therefore, such products can indeed show the role of "degrading pesticide residues" in experiments. However, there are two problems that cannot be solved in this type of cleaning method:
First, different pesticides or antibiotics, oxidative degradation products are different, and even may be more toxic after degradation.
Second, it can degrade pesticide residues and also degrade nutrients.
It is also mentioned in the program that this water can "increase the negative charge of the ingredients, improve the water-locking function of the cells, and restore the original taste of the ingredients."
No matter how you deal with it, the ingredients will be in an electrically neutral state. If the negative charge of the ingredient "increases", where is the corresponding positive charge?
Moreover, if such treatment really improves the "water-locking function of cells", it means that this "human intervention" changes the "natural state" of the ingredients, how can it "restore the original taste of the ingredients"?
What's even more bizarre is that the "apple tomatoes" that have been purified by the purifier are sweeter.
To increase the sweetness of food, you need to increase the amount of sugar, or reduce other substances that affect sweetness (such as acid). The synthesis of sugars is an extremely complex chemical reaction, and the decrease in acidity requires other substances to react. If a "cleansing" method can cause such a huge chemical reaction to food, then should we worry about it having a "harmful" reaction?
In short, this is a typical product that leads consumers to panic by distorting physical phenomena, and then fools consumers through false propaganda. As a public figure, I don't know if Liu Yiwei was fooled by the manufacturer, or went with the manufacturer to fool the consumer?