Speaking of bracken, it can be traced back to the 1940s. At that time, some scientists found that the incidence of chronic hematuria in cattle raised in the lush pastures of bracken was significantly higher than that in ordinary pastures. It turns out that bracken can cause cancer. It was also from that time that people noticed the carcinogenic risk of bracken.
This research lasted until 1983, and Japanese scientists finally found out the cause of cancer in bracken, because bracken contains a natural toxin called protopterin, which is highly carcinogenic. The International Agency for Research on Cancer lists Pteridium aquilinum as a class 2B carcinogen.
After treatment, the "protopterin" contained in bracken will be greatly reduced. For example, after the tender leaves are soaked, blanched and then fried, the content of protopterin will be reduced by almost 50%~90%. Fern root powder is extracted from the roots of wild ferns, and the content of protopterin in young leaves of ferns is about 10 times that of roots, so the risk of eating fern root powder is less than that of eating fresh ferns.
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