The common potato is a member of the Solanum genus and a kissing cousin of deadly nightshade. Like nightshade, the potato produces large amounts of substances called glycoalkaloids, particularly one nasty strain called solanine. This poison is the potato’s defense mechanism that keep it from getting eaten, and is most concentrated in the leaves, stems, and shoots. Spotting any green on the skin of the potato is a sure indication of the presence of solanine. Most commercially available potatoes are carefully cultivated for low levels of the poison, but it is possible to get one with a high amount present, and people have died from ingesting potato solanine. While cooking can reduce the level, every potato you eat gives you at least some small amount of exposure. --
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