Lack of diet diversity is viewed as the major cause of micronutrient malnutrition in Sub-Saharan Africa. Imbalanced diets resulting from consumption of mainly high carbohydrate based-diets also contribute to productivity losses and reduced educational attainment and income. Consequently, micronutrient malnutrition is currently the most critical for food and nutritional security problem as most diets are often deficient in essential vitamins and minerals. In Tanzania, for example, most rural and urban households consume mainly staples as their main food, which are high in carbohydrates, but low in micronutrients and vitamins. Staple food items increase energy availability but do not improve nutritional outcomes if not consumed together with micro-nutrient rich foods.
Although difficult to ascertain whether it is a trend reversal, two recent FAO reports (2017a, b) show a rise in hunger globally as well as in Africa. The number of undernourished (NoU) in the world suffering from chronic food deprivation began to rise in 2014 –from 775 million people to 777 million in 2015 – and is now estimated to have increased further, to 815 million in 2016. The stagnation of the global average of the proportion of undernourished (PoU) from 2013 to 2015 is the result of two offsetting changes at the regional level: in Sub-Saharan Africa, the share of undernourished people increased, while there was a continued decline in Asia in the same period. However, in 2016, the PoU increased in most regions except Northern Africa, Southern Asia, Eastern Asia, Central America and the Caribbean. The deterioration was most severe in Sub-Saharan Africa and South-Eastern Asia (FAO 2017a,b).