You’ve probably seen it before.
You reach into your pantry, grab a potato, and notice something unusual.
Part of its skin has turned green.
At first, it might seem harmless. After all, potatoes are vegetables, and green is a color we usually associate with fresh produce.
But when it comes to potatoes, that green color deserves a closer look.
While a small green patch doesn’t automatically mean the entire potato is unsafe, extensive greening can be a warning sign.
And the reason has to do with naturally occurring compounds that most people rarely think about.
Why Do Potatoes Turn Green?
Potatoes can develop a green color when exposed to light.
The color comes from chlorophyll, the same pigment that gives many plants their green appearance.
Chlorophyll itself isn’t the dangerous part.
However, the conditions that cause potatoes to turn green can also encourage an increase in natural compounds known as glycoalkaloids.
Two important examples are solanine and chaconine.
Potatoes naturally contain small amounts of these substances, but higher concentrations can become harmful.
That’s why green potatoes shouldn’t be treated exactly like ordinary ones.
What Happens If You Eat Too Much Solanine?
Consuming excessive amounts of potato glycoalkaloids can cause unpleasant symptoms.
These may include:
- Nausea and vomiting
- Stomach pain or cramps
- Diarrhea
- Headaches
More serious poisoning is possible when large amounts are consumed.
The risk depends on how much of these compounds the potato contains and how much someone eats.
Unfortunately, you cannot reliably determine the concentration simply by looking at the color.
A potato’s appearance can provide warning signs, but it cannot guarantee safety.
Can You Just Cut Off the Green Part?
This is where things become a little more complicated.
If a potato has only a small green patch and is otherwise firm and in good condition, thoroughly peeling it and generously removing the affected area can reduce exposure to glycoalkaloids.
You should also remove the eyes and any sprouts.
However, trimming does not guarantee that every harmful compound has been eliminated.
If the potato is extensively green, heavily sprouted, or showing clear signs of deterioration, discarding it is the safer choice.
Trying to save one questionable potato simply isn’t worth an unnecessary food-safety risk.
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