If you don’t prepare manioc properly you will cyanide yourself.
Fact: Scientists think the tiny amount of cyanide in prepared cassava may actually help people who eat it every day. It may protect them from diseases such as malaria and sickle cell anemia.
POISON NOTES: Cassava roots contain cyanide but can be made safe to eat by boiling or peeling, grating and washing repeatedly to remove the poison. The little bit of cyanide that remains may actually be beneficial.
Symptoms: Eating raw cassava can cause abdominal cramping, diarrhea and vomiting. High levels of cyanide prevent oxygen from getting into the blood and may even cause death.
I wonder sometimes how some food items became staples. Things like olives and acorns, that have to be extensively processed to be made edible. "Gee, Og eat manioc. Him die in convulsions. Maybe me boil, pound and wash manioc several times, then see if I die of convulsions."