Recently, a large number of media reported that fake duck blood appeared in the Beijing market. Well-known chain hot pot restaurants sipped and sipped, and Little Sheep were all suspected of impersonating duck blood with pig blood. The "duck blood" used in street spicy food was even found to have high formaldehyde content. Many netizens expressed great concern: What is the difference between duck blood and pig blood? Why use pig blood as duck blood? Will there be security problems?

Will pig blood lose nutrition instead of duck blood?

Pig blood, duck blood and other animal blood are all made from animal blood through filtration, coagulation and sterilization, and its main raw material is actually animal blood. Because the output of pig blood is larger and the price is cheaper, there will be merchants who pretend to be duck blood with pig blood to earn profits.

a large part of the reason why people like to eat animal blood is that it is healthy. So some people are worried: will the nutritional value of pig blood become worse if it pretends to be duck blood? To understand this problem, it depends not only on what nutrition is in pig blood and duck blood, but also on what nutrition you hope to get.

By comparison, we can see that the contents of protein, fat and carbohydrate in pig blood and duck blood are almost the same. Eating pig blood or duck blood, the difference is really not too big.

some people eat duck blood to replenish blood. Indeed, animal blood is rich in iron, and almost all of it is heme iron, which is easily absorbed and utilized, which is of great help to enrich blood. So, is there any difference in iron content between the two kinds of blood? From the table, we can see that the iron content in duck blood is more than three times that of pig blood. If we want to supplement iron, the effect of duck blood will be better than that of pig blood. However, the iron content of pig blood is also very rich. Eating pig blood can also replenish blood, and there is no need to eat duck blood. Just like you can usually eat with a small bowl of rice, there is no need to use a large bowl?

Under the dome, it is becoming more and more popular to eat the serum lungs of animals such as pig blood and duck blood. Many people want to clear their lungs by eating duck blood. However, at present, there is no clinical evidence to prove that eating duck blood or other animal blood can "clear the lungs", and there is no special substance in animal blood to clear the lungs. Animal blood is eaten in the stomach, and the lungs and stomach are two different things. Even if the ingredients are adsorptive, it is impossible to directly clean the particles entering the lungs. So, if you want to eat duck serum lung, it doesn't work at all, just like pig blood.

Is there a safety problem when pig blood is passed off as duck blood?

Using pig blood as duck blood belongs to food counterfeiting and adulteration, which is an illegal act and should be severely cracked down. Food adulteration is a commonplace topic with a long history. For example, in ancient China, there was a saying that "selling dog meat by hanging sheep's head". With the modern food industry chain getting longer and longer, there are more and more adulterations, such as "European horse meat storm", "Taiwan Province black-hearted oil incident", "Wal-Mart fox meat incident" and fake mutton. There is also a special term for this kind of incident in the world, which is called "economically motivated adulteration" (EMA), and all countries in the world have severely cracked down on food adulteration.

However, selling pig blood as duck blood may not necessarily cause safety problems. Pig blood and duck blood are both animal blood products. As long as the blood source passes the customs and the quality control is qualified, they can both be safe and edible, just to meet the needs of different people and different markets.

However, if inferior blood sources are used in the production and sales process, illegal substances (such as formaldehyde or industrial additives) are used in the production process, and the quality control is not up to standard, it may bury potential safety hazards. But this is not about the pig blood family. In food production, as long as there is a problem with raw materials, production violations, lack of quality control and so on, all foods have safety risks. The main problem of these products is illegal (inferior). Therefore, even duck blood, if the product is unqualified, there is also a safety risk; Don't devalue pig blood just because merchants pass it off as duck blood. Illegal (inferior) animal blood is the main safety risk.

For illegal (inferior) animal blood products, the safety issue that everyone is most worried about is formaldehyde. Formaldehyde is a non-edible substance, and it is forbidden to be added to food. However, because formaldehyde is a product of normal metabolism, most uncooked foods contain a small amount of formaldehyde. A large number of studies have found that formaldehyde exists in many common foods (including fruits, vegetables, meat, fish, crustaceans and dried mushrooms, etc.). Generally speaking, eating a small amount of formaldehyde will not cause acute poisoning, but eating a large amount of formaldehyde will usually cause severe abdominal pain, vomiting, coma, kidney damage or death. Normal people mainly inhale formaldehyde through breathing, and the intake in food is very low. Many people are worried that formaldehyde will cause cancer, but the World Health Organization believes that the evidence shows that formaldehyde ingested through eating will not cause cancer. So, you don't have to worry too much.

If you are really worried, there are some ways to reduce the risk of formaldehyde. Formaldehyde is a gas with pungent smell. If you smell obvious odor, don't buy it or eat it. Because formaldehyde is soluble in water, cleaning will help to remove formaldehyde. Therefore, if you are really worried, you may wish to rinse it with flowing tap water several times. In addition, the heat generated by cooking also helps to remove formaldehyde, so animal blood can be thoroughly cooked until the central temperature reaches 75 degrees Celsius or above.

how to distinguish pig blood from duck blood?

consumers will think: is there any way to simply tell the difference between true and false duck blood? In fact, the pig blood and duck blood products sold in the market now are processed, and it is difficult to distinguish them by human facial features. Remember the horse meat storm in Europe? In order to detect the composition of horse meat, the European Union adopted DNA detection technology. Similarly, to accurately distinguish duck blood from pig blood, even if you have the eye of the Monkey King, it is difficult to distinguish it. Some identification tutorials circulating on the Internet, such as smelling and tasting, cannot simply distinguish it. According to this method, it is also possible to buy unreliable products. So, it's better to save some time to distinguish between true and false.

Of course, this is not to make you give up "treatment". In order to reduce security risks, you can:

1. Go to a regular consumer place and try not to eat roadside stalls. What you can do is to try to eat or buy in a regular catering unit, and you should ensure some safety and quality. For example, it is reported that the pig blood products of street vendors are found to have formaldehyde. If they are bought by street vendors, it is very likely that they will buy inferior products and face greater safety risks.

2. Don't blindly pursue "good quality and low price". Beware of products that are too cheap, such as duck blood in this supermarket is 3 yuan a box, while it is only 1 yuan a box in a small shop, so you should be careful.

Reference

[1] China Food Composition Table 2112.

[2] Hong Kong Centre for Food Safety. Formaldehyde in Food.