On the Internet, there is always a saying:
High manganese steel used in electric kettles at home will release heavy metal manganese, which will not only lead to memory loss, but also cause lung cancer and skin cancer. ...
Actually, it's all rumors Regular stainless steel products have no risk of excessive manganese, and the manganese we consume through diet is also at a safe level.
Manganese is an essential trace element for human body.
Manganese, a common metal element, is not a scourge, but one of the essential trace elements for human body, which also plays an important role in human health.
Manganese is a component of connective tissue, bones, coagulation factors and sex hormones. It is also indispensable for fat and carbohydrate metabolism, calcium absorption and blood sugar regulation. The brain and nerve function are normal, and manganese deficiency will affect nerve development.
How much is more?
Manganese is an internationally recognized metal element with low toxicity. However, like many mineral nutrients, too much manganese can also cause harm to human body.
At present, the data of countries around the world are not very uniform, and the recommended standards are different.
For adults in China, an adult weighing 60kg should consume at least 4.5mg per day, but not more than 1 1mg. Does manganese in stainless steel need to be worried?
In China, as early as 20 12, stainless steel tableware and cookers bought in the market were randomly selected. The test results show that:
Stainless steel cookware does precipitate a very small amount of manganese, but it is far from being poisoned!
Some friends may ask, so how much manganese do I usually eat every day?
According to the results of the fourth national nutrition survey in China, the daily intake of manganese in China is 6.8 mg. Remember how much we just mentioned not to exceed? 1 1 mg！
So, can you rest assured? Our daily intake of manganese is at a safe level, so don't worry too much.
Different grades of steel have different dangers?
According to media reports, the current electric kettle does not have 304-grade high manganese steel, which precipitates a lot of manganese and is easy to be poisoned.
This statement is wrong for two reasons:
The manganese content in 1. steel is not directly proportional to the intake.
There is no necessary relationship between manganese content and migration in steels with different materials. It is not that the more manganese is contained, the more manganese is precipitated.
In fact, the steel we use is alloy, and the alloy metal is not easy to dissolve in food. Whether it is soaked in vinegar, sauce, tea, juice, etc. It is not so easy to precipitate.
2. The state has regulations and supervision.
Whether it is 304, 340 or any other number, the state has strict standard restrictions on steel suitable for food containers.
Up to now, no cases of excessive manganese and manganese poisoning caused by the use of stainless steel products have been found.
News makes people worry, but when people go to the news, there are no real "victims".
Therefore, we don't need to worry about stainless steel tableware and cookware used in our daily life, let alone be confused by which labels.
Attention should be paid to manganese poisoning.
The intake of manganese should not exceed 1 1 mg per day. If excessive, there will be poisoning symptoms, such as:
The absorption of iron will be inhibited, and long-term excess will affect the function of nervous system. Symptoms similar to Parkinson's syndrome may appear in the later stage of poisoning, such as slow general movement.
In fact, the absorption rate of manganese in the gastrointestinal tract is low, and what should be more worried is the inhaled manganese.
For example, industrial workers who have been engaged in manganese mining, smelting and welding for a long time need to pay attention to prevent manganese from entering the human body from the respiratory tract.
To sum up, I am afraid that manganese will precipitate from stainless steel electric kettle or pot, which will lead to manganese poisoning. It's a little too urgent, so you can use it safely.