17. The potato is one of the world's largest food crops and the source of the much beloved French fry, but what toxin lurks within?
From Quiz Doctor Impossible: Food Edition
Answer:
Solanine
The potato is a starchy staple that historically has served as the main source of nutrition in many countries, particularly in Europe. It is a good source of several vitamins and minerals, including vitamin C, B6 and iron. It comes in a variety of shapes, colors and textures which allows for an assortment of preparation methods, and thanks to the French fry, most Americans at least get some vegetables in their diet.
The dark side of the potato: It is actually a member of the nightshade family (which also includes the highly toxic belladonna). Most members of the family contain solanine which can affect the nervous system and cause headaches, diarrhea and even death. Cooking reduces the toxicity; light exposure, damage and age can increase it. Potatoes that have begun to sprout, wrinkle or turn green shouldn't be eaten. Incidentally, if you've decided to allow your sprouted potato to grow into a plant, keep your pets away from it - the leaves are particularly toxic.