In addition to coriander, durian and stinky tofu, there is also a kind of food that people in Southwest China can’t do without – Houttuynia cordata.

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, but in recent years, with Houttuynia cordata appeared in the public vision, there are also two words “cancer”. It is said that “Houttuynia cordata contains aristolochic acid, which can induce kidney disease and cause cancer”. Is this true?

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facts: aristolochic acid does cause cancer.

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aristolochic acid has been listed as a class of carcinogen by the WHO International Agency for research on cancer in 2002.

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as early as 1992, one hundred women in Belgium had renal failure, uremia and even cancer, which attracted the attention of the medical community because of taking the weight-loss Chinese medicine containing Fangji and Magnolia officinalis imported from Hong Kong.

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in 2003, many domestic media reported that aristolochic acid was contained in aristolochic acid, which led to kidney disease. In the same year, the State Food and Drug Administration canceled the medicinal standard of Aristolochia manshuriensis. According to the media speculation at that time, hundreds of thousands of people might have suffered from kidney disease.

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from 2001 to 2005, the European Union, the United States, Singapore, Hong Kong and other places successively banned the import of Chinese herbal medicine or Chinese patent medicine containing aristolochic acid.

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in 2013, a research group from Singapore published a paper in Science Translational Medicine of the United States, saying that aristolochic acid causes more gene mutations than tobacco, ultraviolet and other carcinogens.

in 2017, the translational medicine sub Journal of science, an authoritative American Journal, published a heavy paper on aristolochic acid. The paper believes that the herbs and preparations containing aristolochic acid are one of the important causes of liver cancer in Asia. This paper also analyzed several liver cancer samples, and the gene sequencing results of liver cancer patients in Taiwan showed that 78% of liver cancer patients were caused by aristolochic acid, and 48% of liver cancer patients in mainland China were attributed to aristolochic acid. The content of

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aristolochic acid is less than aristolochic acid, and the content of

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aristolochic acid can be metabolized into aristolochic acid lactam in human body, but not all of them are nephrotoxic and carcinogenic. In the present study, only aristolochic acid lactam-i is toxic. Aristolochic lactam-b2, A2 and F2 have been found in the extract of Houttuynia cordata Thunb. Whether it contains class I is not clear.

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have been studied by Korean institutions since 2001. In 2kg sun dried auricular root, 7 mg of group A and 25 mg of group B were extracted. Therefore, the content of aristolochic acid lactam in dried auricular root is 16 mg / kg, and the content of them is less. The rumor of

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has been refuted for many times, and has been summarized in the rumors released by the State Food and drug administration. Both the Chinese Pharmacopoeia (2015 Edition) and the notice on further standardizing the management of health food raw materials published by the former Ministry of health have both included Tremella vulgaris in the list of dual-use medicine and food, and the Ministry of agriculture’s “catalogue of products implementing the certification of pollution-free agricultural products” also included it.

note: you can’t eat

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at will. Although there are large-scale planting of

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, the domestication time of auricular root is still too short. It still belongs to wild vegetables. Moreover, it is cold and can’t be eaten for a long time or in large amount. It’s better not to eat more for women with deficiency of spleen and stomach or menstrual period.

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can be eaten by first soaking the root of the ear in water for an hour, then blanching with boiling water, and then seasoning. There is a part of the people may be allergic to the broken ear root, skin itching, swelling and other phenomena, such people do not eat.

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are pure rumors that cause cancer. You can eat them at ease, but you should not eat them every day or eat too much at once.

References:

[1] reporter investigation: the history of aristolochic acid induced liver cancer. Xinhuanet. October 26, 2017

[2] does Houttuynia cordata really cause cancer. Guangzhou Daily. July 15, 2016,

[3] netizens “accused” broken ear roots can cause disease, reporter interviewed experts The official account of the Guizhou Metropolis Daily,.2017, November 19th,

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, without the authorization of the author, prohibit the reprinting of the

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