Doll's lettuce research says that doll's lettuce will cause cancer, in fact, will lead to cancer because of doll's lettuce dipped in an unknown liquid is a formaldehyde solution, after the formaldehyde-soaked doll's lettuce look good, preserved for a longer time. And we all know that formaldehyde is carcinogenic, can lead to cancer and deformity. Fern, recently many people say fern will cause cancer, scared me chopsticks on the vegetables are off, in fact, fern cancer, because the fern has a carcinogen called proto-fern glycosides, with mice to do experiments feeding fern, the results of the mice occurred stomach cancer, intestinal cancer, breast cancer, bladder cancer and other cancers.

The fiddleheads are classified by the World Health Organization (WHO) as a group 2B carcinogen (possibly carcinogenic to humans). Not only that, fiddleheads are the only vegetable that can cause cancer. But those who have eaten fiddleheads don't need to panic, as long as it's not for a long time.