Author: Prof HAKIZIMANA Maurice
Cassava, a staple food for millions, contains a toxic compound called linamarin. When cassava cells are broken, linamarin reacts with an enzyme (linamarase) and releases hydrocyanic acid (cyanide), a dangerous poison. This toxin is heat-stable, meaning it is not destroyed by simple cooking.
If eaten raw or poorly processed, cassava can release harmful levels of cyanide in the body, causing dizziness, vomiting, paralysis, goiter, and in severe cases, death. Acute poisoning often appears within a few hours after consumption.
How Cassava Becomes Safer
Traditional methods—fermentation, soaking, pressing, and proper drying—greatly reduce cyanide content. For example, long soaking (18–24 hours) or fermentation helps break down toxic compounds. Sun-drying alone is not sufficient and may leave dangerous residues.
Health Consequences
- Acute cyanide poisoning: sudden illness or even death after eating raw or poorly processed cassava.
- Goiter and thyroid problems: thiocyanate, the detoxified form of cyanide, interferes with iodine absorption. Populations eating cassava with little dietary iodine or protein often suffer from endemic goiter and, in some cases, cretinism.
- Neurological disorders: in West and Central Africa, excessive consumption of bitter cassava with little protein has been linked to tropical ataxic neuropathy and epidemic spastic paralysis, both caused by long-term cyanide exposure damaging the spinal cord.
Lessons from Research
Studies show that diets rich in protein (especially sulfur-containing amino acids) and iodine protect against cassava toxicity. Communities that combine cassava with beans, fish, or meat rarely face health crises, while those relying almost exclusively on cassava during droughts or food shortages are most at risk.
Conclusion
Cassava can be a safe and valuable food—but only when carefully processed. Proper fermentation, soaking, and balanced diets are essential to avoid cyanide poisoning and its devastating effects on health
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Prof. Maurice HAKIZIMANA
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