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Mar 03, 2026

Over 200 People Are Killed by the “World’s Deadliest Food” Every Year — Yet Nearly 500 Million Still Eat It

Every year, more than 200 people die from consuming what is often called the world’s deadliest food. Surprisingly, nearly 500 million people continue to eat it regularly.

You might expect this food to be some rare exotic delicacy or dangerous seafood. Instead, it’s a common root vegetable: Cassava.

Cassava is widely eaten across Africa, Asia, and Latin America. It is also the source of tapioca pearls and cassava flour. Despite its importance as a staple food, cassava can become deadly if not prepared correctly.


What Makes Cassava Dangerous?

Cassava naturally contains compounds called cyanogenic glycosides. When the plant’s cells are damaged through chewing, grinding, or processing, these compounds can release hydrogen cyanide, a highly toxic poison.

Improperly prepared cassava can cause:

  • Headaches

  • Dizziness

  • Vomiting

  • Paralysis

  • Neurological damage

  • Death in severe cases

Long-term exposure to small amounts of cyanide from cassava can also cause a neurological condition called Konzo, which leads to irreversible paralysis of the legs.


The Two Main Types of Cassava

Sweet Cassava

This variety contains lower levels of toxins and is usually safe after proper cooking, especially boiling.

Bitter Cassava

This type contains much higher cyanide levels and requires extensive preparation such as soaking, fermenting, and prolonged cooking before it is safe to eat.


Why Do So Many People Still Eat It?

Cassava is extremely valuable because it:

  • Grows in poor soil

  • Survives drought conditions

  • Produces large amounts of calories

  • Helps prevent famine in many regions

For millions of families, cassava is not just food — it is a survival crop.


How Cassava Is Made Safe

Traditional preparation methods remove most of the toxins.

1. Peeling and Grating

The peel contains the highest concentration of toxins, so it is removed first.

2. Soaking

The grated cassava is soaked in water for 24–72 hours, allowing toxic compounds to break down and dissolve.

3. Fermentation

For bitter cassava, fermentation further reduces toxin levels.

4. Cooking

Boiling, frying, roasting, or baking helps evaporate any remaining hydrogen cyanide.

When prepared correctly, cassava is considered safe to eat.


Is Cassava Really the “World’s Deadliest Food”?

The title is somewhat sensational, but there is truth behind it.

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