Cassava is the third-largest source of food carbohydrates in the tropics, after rice and maize.[1][2] Cassava is a major staple food in the developing world, providing a basic diet for over half a billion people.[3] It is one of the most drought-tolerant crops, capable of growing on marginal soils. Nigeria is the world's largest producer of cassava.[4]
Cassava root is a good source of carbohydrates, but a poor source of protein. A diet consisting predominantly of cassava root can cause protein-energy malnutrition.[5]
Cassava is classified as sweet or bitter. Like other roots and tubers, cassava contains antinutritional factors and toxins.[6] It must be properly prepared before consumption. Improper preparation of cassava can leave enough residual cyanide to cause acute cyanide intoxication and goiters, and may even cause ataxia or partial paralysis.[7] Nevertheless, farmers often prefer the bitter varieties because they deter pests, animals, and thieves.[8] The more-toxic varieties of cassava are a fall-back resource (a "food security crop") in times of famine in some places.[9]
Description
Unprocessed cassava roots
The cassava root is long and tapered, with a firm, homogeneous flesh encased in a detachable rind, about 1mm thick, rough and brown on the outside. Commercial varieties can be 5 to 10 cm in diameter at the top, and around 15 cm to 30 cm long. A woody cordon