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why do you not eat green potatoes

The potato — or, rather, green versions of it — contains a natural toxin called solanine. The greenish hue that should warn you away from such spuds is actually chlorophyll, but its presence indicates concentrations of solanine are present in the tuber.
A glycoalkaloid poison found in species of the nightshade, solanine is a nerve toxin produced in the green part of the potato (the leaves, the stem, and any green spots on the skin). This bitter poisonous crystalline alkaloid is part of the plant's defenses against insects, disease, and predators. Potato leaves and stems are naturally high in glycoalkaloids, so ingestion of these parts of the plant should be avoided.
Solanine develops in potatoes when spuds are subjected to light or either very cold or very warm temperatures. The toxin interferes with the body's ability to use a particular chemical that facilitates the transmission of impulses between cells. Ingested in large enough amounts, it can cause vomiting, diarrhea, headaches, and even paralysis of the central nervous system.
However, unless you are deliberately seeking out green potatoes to eat, you are unlikely to ingest enough of the toxin to do harm. The potatoes we buy contain such a minute amount of the chemical that a healthy adult would have to eat about 4-1/2 pounds at one sitting to experience any neurological symptoms. Ergo, don't worry about having the occasional green potato chip, but do discard any potatoes that have green eyes, sprouts, or greenish skins, rather than prepare and serve them, especially to children. 
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