Summary4 points
- Yellow cassava, bred for higher vitamin A, now reaches over ten million Nigerians through roughly two million farming households.
- Nearly two thirds of Nigerian preschoolers are vitamin A deficient, according to national data.
- The biofortified variety yields about double the harvest of standard improved cassava, giving farmers a direct incentive.
- A three-month Osun State study found measurable vitamin A gains in children fed the biofortified crop.
Behind a small shop built from a converted shipping container, Funmi Akinola splits her time between selling cassava flour and running a snack business out back. The flour she sells is not ordinary. It comes from a variety of cassava bred to be yellow instead of white, and that colour change carries real vitamin A inside it.
Her shop is one small piece of a much larger effort. Across Nigeria, an estimated two point one million farmers now grow this yellow cassava, and the added vitamin A it provides reaches more than ten million people, according to a 2024 review by the International Food Policy Research Institute.
Why This Matters Right Now
Vitamin A deficiency in Nigeria is not a minor gap in an otherwise healthy diet. National data compiled by HarvestPlus shows nearly two-thirds of Nigerian preschool children are vitamin A deficient, over sixty percent suffer from anaemia, and more than a third are stunted. These are not rare conditions affecting a small population; they affect most young children in the country.
Cassava sits at the centre of that problem and its potential solution at the same time. Nigerian families already eat it almost daily, as gari, fufu, eba, or tuwo, so a version of the same crop that happens to carry more vitamin A does not require anyone to adopt a new food. It only requires planting a different stem.
How Yellow Cassava Was Built
This is plant breeding, not genetic modification in a laboratory sense. Scientists at Nigeria’s National Root Crops Research Institute and the International Institute of Tropical Agriculture crossed and selected cassava plants over successive generations, working from breeding lines developed with the International Center for Tropical Agriculture, to raise the natural beta carotene content of the root. Beta carotene is the same pigment that turns carrots orange, and the body converts it into vitamin A.
The work began in earnest around 2011, backed financially by the Cassava Transformation Agenda under Nigeria’s Federal Ministry of Agriculture and Rural Development, alongside HarvestPlus. Nine distinct vitamin A cassava varieties have been released in Nigeria since then, along with eleven varieties of vitamin A maize and three of vitamin A orange sweet potato, giving farmers in different regions a version suited to their local staple.
Eaten twice a day, yellow cassava can supply up to one hundred per cent of a child’s daily vitamin A requirement. A field study conducted in Telemu, Ashamu, and Ilemowu, three rural communities in Osun State, tested this directly. Preschoolers who ate the biofortified yellow cassava for about three months showed a significant rise in vitamin A intake and blood status compared with children fed ordinary white cassava.
The Reason Farmers Actually Switched
Public health campaigns often struggle at exactly this step, getting people to adopt something because it is good for them. Yellow cassava sidesteps that problem in a way few nutrition interventions manage. Survey data collected on Nigerian farms found vitamin A cassava varieties yield an average of twenty point five metric tonnes per hectare, roughly double the ten point two tonnes farmers get from other improved but non biofortified varieties.
That means a farmer switching to yellow cassava is not making a sacrifice for public health, they are very likely increasing their own harvest and income at the same time nutrition improves downstream. HarvestPlus Nigeria has leaned into that incentive directly, building an e-market and stem distribution system where poorer farmers receive planting material free through farmer to farmer sharing, while medium scale growers multiply and sell stems commercially.
Getting It Onto Nigerian Plates
Growing the crop is only half the chain. HarvestPlus Nigeria has also worked to get processed vitamin A cassava products, flour, gari, and snack items like the ones Funmi Akinola sells, into shops and markets nationwide, alongside an annual Nutritious Food Fair and a network of community based Smart Mother groups that teach food preparation and child nutrition together.
That combination, a crop that pays for itself agronomically plus a visible retail presence, is what separates this from a supplement aisle claim. Every number behind yellow cassava, the yield data, the Osun State child health study, the farmer adoption count, traces back to named research institutions and a public reviewable program, not a product label.
What This Means For Nigerian Families
For a household already buying gari or cassava flour at the market, nothing about the daily routine changes by choosing the yellow variety over the white one. The vitamin A is already inside the food by the time it reaches the pot. For farmers still growing the older white varieties, the yield gap alone is a reason to ask a local extension office or agricultural development programme about switching, independent of the nutrition argument entirely.
Work is continuing on iron and zinc biofortified sorghum and pearl millet for Nigeria’s northern states, where cassava is less central to the diet, following the same logic, breed the nutrient into a crop people already grow and eat, rather than asking them to add something new.
