The mice were fed with bracken in the laboratory. As a result, the mice developed gastric cancer, intestinal cancer, breast cancer and bladder cancer. The experimental data also showed that the content of these carcinogens was the highest in the rhizome of Pteridium aquilinum, followed by leaves.

Protopterin is also a very unstable compound, which can be dissolved in hot water or hot ethanol, and can be transformed into pterin B with no carcinogenic activity under acidic conditions at room temperature, and may be transformed into a near carcinogen/mutagen-an unstable diketene under alkaline conditions, which can make the DNA structure unstable and break, thus triggering a series of abnormal cell reactions and eventually leading to cell mutation.

2. Hemerocallis

Fresh day lily contains toxic substance colchicine. After this substance enters the human body, it will cause dry throat, thirst, burning sensation in the stomach, nausea, vomiting, abdominal pain and diarrhea.

3. Fresh lentils

Fresh lentils contain saponins and alkaloids, which are toxic, but will dissolve when heated. Blanch with boiling water or oil before eating, or dry in the sun until it becomes discolored before eating.

4. Immature tomatoes

Because immature tomatoes contain alkaloids, people will be poisoned if they eat them. So, be sure to eat red and ripe tomatoes. Especially if you have children at home, you may not notice it. Eat it directly, but it is no problem not to eat a lot.

Extended data:

Doctors recommend vegetables:

1, cucumber

Cucumber contains vitamin C, vitamin B and many trace minerals. Rich in nutrition and crisp and refreshing when eaten raw. From the point of view of nutrition, cucumber skin is rich in nutrition and should be eaten raw.

However, in order to prevent the harm of pesticide residues to human body, cucumber should be soaked in salt water 15-20 minutes before being washed and eaten raw. When soaking cucumbers in salt water, don't pinch your head and remove the roots. Keep the cucumber intact and avoid the loss of nutrients in the cut surface during soaking. In addition, cold salad should be cooked and eaten now, and it should not be put for a long time after it is done, which will also lead to the loss of vitamins.

2, persimmon pepper or pepper

Pepper is the food with the richest vitamin C content in all vegetables. Vitamin C can improve human immunity and help to resist various diseases. In summer, people catch colds easily and often go out. They have more contact with the external environment and more chances of being infected with the virus, so they need to improve their immunity.

Henan Health News Network-These three vegetables are never eaten by doctors. The more you eat, the happier the cancer cells are.

People's Network-Six Vegetables Recommended by Doctors to Lose Weight Quickly