5. Apples

Apples seeds make a bad snack. However, you can easily eat the fruit itself without experiencing any kind of health problems. The worst thing about apple seeds is that they contain cyanogenic glycosides. This chemical turns into cyanide through an enzymatic process. If you like apples, eat them at the core and do not chew or swallow the seeds. You will not die if you consume a seed or two, but if eaten in larger quantities, they will do harm.

6. Potatoes

French fries, baked, mashed or boiled potatoes are not harmful at all. We eat potatoes on a regular basis and think that this plant is innocent. As a matter of fact, this starchy vegetable belongs to the Nightshade family. You can find species that contain chaconine and solanine. Both of these compounds are called glycoalkaloids. The plant produces these chamicals to protect itself from insects, fungi and bacteria. The chemical is poisonous not only for insects, but for humans as well.