Lack of adequate nutrition remains the world's most prevalent health problem and the single biggest contributor to child mortality. It is a direct or indirect cause of 43% deaths worldwide among children under 5 years of age. The two separate forms of malnutrition - wasting (a deficit in weight relative to length) and stunting (a deficit in length relative to age) are closely related and often occur together in the same children, leading to an increased risk of mortality. Although the prevalence of stunting is decreasing worldwide, Africa faces a rise in the absolute number of stunted children. Malawi is amongst the countries most affected in sub-Saharan Africa with 42% of the children being stunted and 4% wasted.
Maize is the principal food crop and dietary staple in many parts of the developing world including Malawi. This reliance on maize and the lack of dietary diversity is a significant contributing factor to micronutrient deficiencies (present in over 30 percent of the population).
Supplementary feeding by provision of extra nutrient-dense food beyond the home diet is an intervention aimed at improving the nutritional status or preventing the nutritional deterioration of the target population. Multiple socioeconomic and cultural factors play a role in determining the type and content of supplementary foods provided in different countries. The acceptability and efficacy of the nutrition support is variable (depending on sensory perception of the food, price, convenience of preparation, etc.) and can be a limiting factor for success in preventing and treating moderate and severe acute malnutrition. In this context there is an increasing demand for innovative strategies offering alternative solutions for year-round access to commonly consumed home-grown products with good nutritional value in countries with widespread hunger.
Moringa Oleifera - widely regarded as the 'miracle tree' has been described as 'a nutritional and medicinal cornucopia'. The Moringa plant is native to Northern India but has become naturalized in Malawi where it is common throughout. All parts of the plant are usable for different purposes, but for human and animal nutrition the leaves are the most widely utilised. Moringa leaves can be repeatedly and sustainably cropped and are rich in macro- and micronutrients, as well as bioactive compounds. These nutritional characteristics give Moringa the potential to significantly contribute in Malawi's battle against protein-energy malnutrition and mineral element deficiencies, providing home-grown feed and food products to replace/partly replace, with economic advantage, imported nutrient premixes.
Research devoted to nutritional characterisation of Moringa oleifera shows that it is a rich source of affordable, readily available, essential nutrients and phytoconstituents. The Moringa foliage is a good source of minerals, carotenoids and tocopherols, polyunsaturated fatty acids, ascorbic acid, folate and phenolics. Studies in animal models report significantly higher bioavailability for iron from Moringa foliage when compared to ferric citrate. Additionally, some major forms of folates were found to be highly bioavailable compared to other folate-rich foods, such as green leafy vegetables. However, different factors such as environmental, genetic, postharvest handling, stage of leaf development - significantly influence nutrient contents of Moringa leaves.
In human studies conducted with Moringa Oleifera to date, no adverse effects are reported and in many parts of the world its use as a food fortificant is on the increase. However, although many studies report improvement in the nutritional value of foods fortified with Moringa Oleifera, none of them show the digestibility (in-vivo or in-vitro) and nutrient bioavailability and high-quality research on its proposed nutritional and health benefits is currently scarce.
There are several variations (continuously refined to better meet the nutritional needs of beneficiaries) of currently endorsed fortified blended foods (FBF) used in global feeding programmes and imported into the country of need. Corn Soya Blend (CSB) fortified with a vitamin and mineral premix (SUPER CEREAL) is one such combination provided by the World Food Programme (WFP). The premix formula used may meet the minimum international standards, but is manufactured using inorganic compounds, which may not be fully bioavailable.
To the investigators' knowledge no human intervention trials have attempted to compare Moringa as modification substitute in specially formulated supplementary foods in order to evaluate in vivo bioavailability of key nutrients and bioactives and biological activities of the plant. This would give the potential for development for alternative formulations for locally produced supplementary foods.
Therefore, in this study the investigators aim to assess the nutritional composition of Moringa leaves (grown in three different sites in Malawi) in terms of macro-, micro- and non-nutrient composition. The sample with the most favourable profile will be used in a subsequent human intervention study. With this randomised, controlled, crossover-design study the investigators aim to evaluate the bioavailability potential of Moringa oleifera in terms of key nutrients and bioactives when compared with the current nutrient supplement SUPER CEREAL.
This human study is part of a wider collaborative study "MORINGA; delivering nutrition and economic value to the people of Malawi", investigating the possibility of establishing Moringa oleifera as an economically viable crop which will contribute towards launching a resilient food supply chain in Malawi that will deliver essential nutrients across the population.
Scientifically proven nutritive benefits of locally grown in Malawi Moringa oleifera could help to replace currently imported nutrients and products and develop sustainable production of a high-protein, micronutrient rich crop.
Two types of diets will be prepared:
Control meal: Corn Soya Blend Test meal: Corn Moringa Blend
In an acute intervention, these two test meals will allow us to evaluate the bioavailability of key nutrients and bioactives provided by Corn Moringa Blend when compared with Corn Soya Blend fortified with by an addition of a Micronutrient Premix.
In a cross-over fashion subjects will be randomly allocated to consume the Corn Moringa Blend or the Corn Soya/Micronutrient Premix Blend test meal. The volunteers will be invited to return to the Human Nutrition Unit (HNU) of the Rowett Institute for two intervention sessions. Both intervention sessions will be identical in all aspects except for the composition of the experimental meals.
For the duration of the intervention session (over 24 hour period), the volunteers will be asked to continue the low phytochemical diet and only consume water for the first five hours following consumption of the test meal. Each treatment session will be followed by at least one week wash-out period before crossing over to the second treatment.
