In a domestic research paper, the changes of nitrite content in 24 pots of four hot pot soups were measured. Data were collected at four points during the determination, namely, at the beginning of eating and 30, 60 and 90 minutes after washing various foods.
The results showed that the content of nitrite in hot pot soup did increase with the extension of determination time. By the end of the 90-minute meal, the increase of sauerkraut soup was the largest, 9.83 times, and seafood soup was also higher, 7.06 times. The increase of bone soup base and Yuanyang soup base is small, which is 2.88 and 3.05 times respectively.
From the content of nitrite, the initial concentration of the bottom soup is similar, ranging from 1.3 ~ 1.8mg/l, but the difference of nitrite content is getting bigger and bigger with the extension of rinsing time. The final content of sauerkraut soup is as high as 15.73mg/L, and that of seafood soup is as high as12.70 mg/L. Therefore, it is well-founded that shabu-shabu soup is unhealthy for too long.
However, after drinking this soup, will nitrite poisoning happen? According to the highest 15mg/L, if you drink 2 small bowls (400ml) of soup, the intake of nitrite is 6mg. Plus the value in the rinsed food, it should not exceed 20mg. This value is not enough for most people to suffer from nitrite poisoning, because the dose of nitrite poisoning is usually above 200mg.
But it doesn't mean that it won't bring adverse effects to the human body because it won't cause acute poisoning. The contents of amino acids and amines in hot pot soup are relatively high, and it is likely to synthesize nitrosamine carcinogens with nitrite under heating conditions. The carcinogenic dose of nitrosamines to rats is 0.75 mg per day. In dry seafood, the content of nitrosamines allowed by the state is only a few micrograms, so what about in soup? Obviously, the content should be lower to make people feel at ease. Although there is no determination data of nitrosamine content in soup, it is estimated that its value will not be very low. If you eat such shabu-shabu frequently, don't underestimate the risk of promoting cancer.