Potatoes contain two kinds of glycoalkaloids, both natural toxins, called solanine and chaconine. Exposure to light greatly increases the formation of chlorophyll and glycoalkaloids. Chlorophyll is responsible for the green color of many plants and is not toxic.
Are potatoes ever poisonous?
Not to worry though, fatal cases of solanine poisoning are very rare these days. Most commercial varieties of potatoes are screened for solanine, but any potato will build up the toxin to dangerous levels if exposed to light or stored improperly.
Is potato poisonous when it is sprouted?
Thanks, Bob A. Dear Bob: Potato sprouts are considered toxic due to their potentially high concentration of glycoalkaloids, which can exert their toxic effects on the nervous system by interfering with the body's ability to regulate acetylcholine, a chemical responsible for conducting nerve impulses.
