Potatoes are a staple in many kitchens—versatile, filling, and inexpensive. But not all potatoes are created equal, and some, like sprouted or green potatoes, can pose serious risks to your health. If you’ve ever noticed green patches or sprouting eyes on your spuds, it’s time to stop and think before tossing them into your favorite recipe.

Sprouted or green potatoes contain harmful compounds known as glycoalkaloids, specifically solanine and chaconine. While these natural toxins are part of the potato’s defense system, they can cause health issues if consumed significantly. Let’s dive deeper into why these common culprits shouldn’t make it to your plate and how you can keep your meals safe and nutritious.

What Are Glycoalkaloids?

Glycoalkaloids are naturally occurring chemical compounds found in potatoes and other nightshade family members, like tomatoes and eggplants. In potatoes, the two primary glycoalkaloids are solanine and chaconine. These compounds protect the plant from pests and pathogens, but they’re not meant for human consumption in high concentrations.^[1]

Glycoalkaloids are most concentrated in potato skin, sprouts, and green patches. When potatoes are exposed to light, improperly stored, or start to age, their glycoalkaloid levels can increase, making them potentially toxic.

Health Risks of Eating Sprouted or Green Potatoes

Consuming potatoes with elevated levels of glycoalkaloids can lead to unpleasant—and sometimes serious—health effects. Symptoms of glycoalkaloid poisoning include:

• Gastrointestinal Distress: Nausea, vomiting, diarrhea, and abdominal pain are common early signs of toxicity.
• Neurological Symptoms: Glycoalkaloids can interfere with nerve function, leading to headaches, dizziness, and in extreme cases, hallucinations.
• Fatigue and Weakness: Prolonged exposure to even small amounts of glycoalkaloids may lead to feelings of lethargy or weakness.
• Severe Reactions: In rare cases, high levels of glycoalkaloid poisoning can result in more severe outcomes, such as respiratory distress or coma.

While cases of severe poisoning are rare, it’s not worth taking the risk—especially when the warning signs of sprouted or green potatoes are easy to spot.

How to Identify Toxic Sprouted or Green Potatoes

Not sure if your potatoes are safe to eat? Here are the signs to watch for:

• Green Skin or Flesh: If you notice green spots on your potatoes, it clearly indicates elevated glycoalkaloid levels.
• Sprouts or Eyes: Sprouted potatoes are another sign that glycoalkaloids have likely increased.
• Mushy Texture: If your potatoes feel soft or mushy, it’s time to toss them. Spoiled potatoes can harbor bacteria in addition to glycoalkaloids.
• Bitter Taste: A bitter or unpleasant taste is a clear sign that a potato has gone bad, even if it doesn’t look green or sprouted.

What to Do with Sprouted or Green Potatoes

When you spot green or sprouted potatoes in your kitchen, you might be tempted to salvage them by peeling off the green parts or cutting out the sprouts. While this can reduce glycoalkaloid levels, it doesn’t guarantee that the potato is entirely safe to eat—especially if the green areas are widespread or the potato is heavily sprouted.

Instead, consider these safer options:

• Compost Them: If you have a compost bin, sprouted or green potatoes make excellent additions to your compost pile.
• Plant Them: Turn your green potatoes into a gardening project by planting them and growing new potato plants.
• Toss Them: When in doubt, it’s better to throw away questionable potatoes than risk your health.

How to Store Potatoes to Prevent Toxins

Proper storage is key to preventing potatoes from turning green or sprouting. Here are some tips to keep your spuds safe:

• Store in a Cool, Dark Place: Potatoes should be stored in a cool, dry, dark environment, such as a pantry or root cellar. Exposure to light causes greening and increases glycoalkaloid production.
• Avoid Refrigeration: While throwing potatoes in the fridge is tempting, cold temperatures can convert their starches into sugars, affecting their flavor and cooking properties.
• Use a Paper Bag or Ventilated Container: Store potatoes in breathable containers to reduce moisture buildup, which can accelerate spoilage.
• Separate from Onions: Storing potatoes and onions together can cause both to spoil faster due to the gases they release.

Why Potatoes Are Still Worth Eating

Potatoes are an incredibly versatile and nutritious food when stored and prepared properly. They’re rich in potassium, vitamin C, and fiber, providing a great energy source. By following a few simple precautions, you can enjoy the benefits of potatoes without the risks.^[2]

The Bottom Line

Sprouted and green potatoes are more than just a cosmetic issue—their glycoalkaloid content can pose real health risks. By learning how to identify, store, and handle potatoes properly, you can ensure your meals are delicious and safe.

In the world of non-toxic living, it’s all about making informed choices. Toss those questionable spuds, stick to proper storage techniques, and enjoy your potatoes as they were meant to be—wholesome, nourishing, and toxins-free.

References:

1. Chain (CONTAM), EFSA Panel on Contaminants in the Food, et al. “Risk Assessment of Glycoalkaloids in Feed and Food, in Particular in Potatoes and Potato‐derived Products.” EFSA Journal, vol. 18, no. 8, Aug. 2020, p. E06222.
2. Górska-Warsewicz, Hanna, et al. “Vegetables, Potatoes and Their Products as Sources of Energy and Nutrients to the Average Diet in Poland.” International Journal of Environmental Research and Public Health, vol. 18, no. 6, Mar. 2021, p. 3217.