Vitamin A content and bio-availability of South African maize meal (as purchased and consumed)

In 2003 the Department of Health of South Africa embarked on a mandatory fortification programme of maize meal as part of the Integrated Nutrition Program (INP) to alleviate malnutrition. The aim of this study was two-fold: firstly, to determine the vitamin A content of South African fortified white maize meal as purchased and the maize porridge as traditionally prepared from it as consumed and secondly, to determine the relative efficacy of the daily consumption of maize meal in sustaining or improving vitamin A status. Maize meal samples for analysis were purchased from various supermarkets and small retail outlets. A High Performance Liquid Chromatograph-Diode Array Detector system with a Reverse Phase C-18 column and isocratic elution was used for separation and quantification of vitamin A. The highest mean vitamin A concentration measured in the maize meal was 261 μgRE/100g and the lowest mean vitamin A concentration was <19 μgRE/100g. Pertaining to the regulations the final minimum level of vitamin A in fortified maize meal must not be less than 187.7 μgRE/100g. The average retention of vitamin A in maize porridge as the difference in vitamin A concentration measured between raw maize meal and cooked porridge was calculated at 39.8%. One of the considerations in a fortification program is the availability of certain micronutrients in the fortified foods, with the focus in this project on vitamin A. An animal model, namely chickens, closely relating the metabolism of vitamin A in humans was used. Chickens are very susceptible to vitamin A deficiencies with similar symptoms. Growth and vitamin A status was evaluated by the weight, feed conversion and liver retinol stores of chickens on five different maize based diets over a six week period. No significant difference in vitamin A levels in the livers of birds on diets with fortified white maize meal, compared to the normal poultry diet consisting of yellow maize meal with added vitamin A was found. It can thus be concluded that the fortificant in the white maize meal is as bioavailable as the vitamin A in the premix used in poultry nutrition. The results of this study show that the vitamin A added as fortificant is absorbed and available to the body. Therefore, fortification of commonly eaten staple foods in the country can significantly improve the vitamin A intake of the population and will improve the overall micronutrient density of their diets. Fortification should be set at levels to include losses incurred through packaging and during transportation, shelf losses and preparation losses. It is also important that the vitamin A content of the product as purchased and consumed must be regularly monitored and regulated by government. Valid and reliable evaluation data are needed to evaluate a program’s success, and to make timeous adjustments for optimal efficiency.Thesis (PhD)--University of Pretoria, 2011.Animal and Wildlife Sciencesunrestricte

Nutrition-Sensitive Agricultural Development for Food Security in Africa: A Case Study of South Africa

The paradox of persistent under‐nutrition and food insecurity; as well as the increasing the incidence of over nutrition is particularly observed in middle –income countries experiencing rapid westernisation such as South Africa (SA). Values of household Food insecurity remains high, whereas overweight and obesity are increasing at a rapid rate. Agriculture and the food system play a key role in nutrition, health and food security. It provides for the primary sources of energy along with essential nutrients, while simultaneously being a source of income, creating jobs and earning foreign exchange. This case study presents the current nutrition sensitivity of the South‐African agriculture and food systems (including governmental prioritization) and highlights the importance of this for future development towards improved food and nutrition Security and nutritional status. Since 2013, discussions on a single, comprehensive, food security and nutrition policy and implementation plan for South Africa have been in process with the aim to coordinate the improvement of both food security and all forms of malnutrition. Yet, the case study findings indicate an unfortunate lack of understanding about nutrient density and dietary diversity and the role which this could play in combating non‐communicable diseases in addition to food insecurity and hunger

Cholesterol, fatty acids profile and the indices of atherogenicity and thrombogenicity of raw lamb and mutton offal

Dietary fats may affect blood lipid levels and the development of cardiovascular diseases. Offal, may contribute to food security in marginalised communities and information on the contribution to dietary fat intake is needed to inform dietary guidelines and recommendations and consumers. This study aimed to describe the fatty acid profile, cholesterol content and indexes of lipid quality. The fatty acid profile and cholesterol were determined by gas chromatography coupled with flame ionisation detection (GC-FID). To evaluate lipid quality the indices of atherogenicity (IA) and thrombogenicity (IT) were calculated. Offal products can contribute beneficial fatty acids to the diet, not only in terms of essential fatty acids such as linoleic (C18:2n-6) and alpha linolenic (C18:3n-3) acids, but also the polyunsaturated fatty acids, arachidonic (C20:4n-6) and eicosapentaenoic (C20:5n3) acids. The offal studied in the present work showed a P/S ratio of 0.04–0.12 and the n-6/n-3 ratio varied between 3.9 and 12.5.The Department of Science and Technology (DST)/National Research Foundation (NRF) South African Research Chairs Initiative (SARChl) in the National Development Plan Priority Area of Nutrition and Food Security (Unique number: SARCI170808259212), the Research Technology Fund of the National Research Foundation and Red Meat Research and Development of South Africa.http://www.elsevier.com/locate/foodchem2021-12-13hj2021Animal and Wildlife Science

Vitamin A content of fortified maize meal and porridge as purchased and consumed in South Africa

In 2003 the Department of Health of South Africa embarked on a mandatory fortification programme of maize meal as part of a nutrition programme to alleviate malnutrition. The aim of this study was to determine the vitamin A content in fortified white maize meal and the maize porridge prepared with it as purchased and consumed. The highest mean vitamin A concentration in the maize meal was 261 μgRE/100 g and the lowest mean vitamin A concentration was b19 μgRE/100 g. Pertaining to regulation the final minimum level of vitamin A in fortified maize meal shall not be less than 187.7 μg/100 g (Department of Health, 2003). The average retention of vitamin A in maize porridge as the difference in vitamin A concentration between raw maize meal and cooked porridge was calculated as 39.8%. Although fortification of maize meal can improve the vitamin A intake of the population, it must be regularly monitored and regulate in order to be beneficial. If not then fortification might as well be voluntary.The National Research Foundationhttp://www.elsevier.com/locate/ foodresnf201

Effect of different maize meal diets on growth and vitamin A : case-study on chickens

South Africa embarked on mandatory vitamin and mineral fortification of wheat flour and maize meal in 2003 as part of a multi-faceted approach to alleviate malnutrition. However, it was reported, in 2008, that vitamin A deficiency increased despite the mandatory fortification programme. This motivates an investigation into the absorption of vitamin A as fortificant in the maize meal. Relative absorption, in chickens as the biological model, was determined by evaluating growth and vitamin A status. The weight, cumulative feed intake and liver retinol stores of chickens on different diets were measured over a 6 week period. The fortified white maize meal diet was able to maintain the vitamin A status of the chickens. Poor absorption of the fortificant vitamin A is therefore not a constraint in combating vitamin A deficiency. It is in therefore also important to focus on the level of fortification delivered when consumed as a traditional prepared dish. In the traditional diet, maize porridge is often consumed with only a relish. The total fat content of the traditional meal is very low, lacking absorption enhancers.National Research Foundationhtt[p://www.elsevier.com/locate/foodchemhb201

Development of a rapid assessment method for the prediction of the glycemic index

The glycemic index (GI) is a measurement used to classify foods according to their potential for raising blood glucose levels. The GI of a foodstuff is generally measured by determining the increment in blood glucose concentration after the consumption of a test meal over a set period of time and comparing it with an isoglucosidic control meal (normally white bread or glucose) and expressed as a percentage within a group of individuals (in vitro). Rapid analysis methods (in vivo) have been evaluated worldwide, and in many cases these values have correlated with the GI values determined by in vitro methods. Rapid analysis methods are criticised for not providing numerical GI values, although proposed labelling legislation in South Africa recommends that suppliers should indicate only if the product has a high, intermediate or low GI. The purpose of this study was to investigate existing rapid assessment methods for the prediction of GI, and to develop a method for South Africa to be used by food producers in line with the newly proposed national labelling requirements. The preliminary studies on the developed rapid assessment method indicated good repeatability (CV 0.78%), reproducibility and precision (CV 3.5%), with accurate prediction of a food’s GI category as high, intermediate or low.The National Research Foundation (NRF)http://www.elsevier.com/locate/jfcanf201

A consumer perspective of the South African red meat classification system

The South African consumer market is characterised by socio-economic and cultural diversity. Food expenditure patterns, behaviour and preferences differ significantly between the various socio-economic sub-groups. Packaging information, including red meat classification information, could be an important tangible resource used by consumers to gauge product quality. The first objective of the research reported in this paper is to investigate the red meat knowledge, usage and perceptions regarding beef and sheep meat classification and related quality parameters among South African consumers. Consumer perceptions of red meat classification were extracted from a comprehensive consumer survey among stratified representative samples of South African low-, middle- and high-income consumers (n = 165, n = 171 and n = 249). The paper also briefly reports on an in-store ‘observational’ research project that was conducted to develop an understanding of the communication of carcass classification to consumers through fresh red meat product labels at independent butchers and large retailers across South Africa (n = 60). Low-income consumers had very limited understanding and gave little attention to red meat classification. Even though middle-class and wealthy consumers also have a limited understanding of red meat classification, about half of these consumers check for a classification mark. Red meat classification was not mentioned by consumers as a major concern regarding red meat, but related aspects were important such as quality, fattiness, tenderness, juiciness, taste, freshness, smell and appearance. Purchase considerations for beef and mutton/lamb focussed largely on safety, appearance, price and eating quality. Labelling information observed at retail outlets gave very little attention to classification. There is a definite need for consumer education relating to the red meat classification system and for the development of an appropriate front-of-pack labelling system to communicate red meat classification.The authors The Red Meat Research and Development South Africa (RMRDSA), and the Institute of Food, Nutrition and Well-being, University of Pretoria.http://www.sasas.co.za/am201

Effect of animal age and trimming practices on the physical composition of Bonsmara beef

Increased economic incentive for producing young and leaner carcasses, as well as demand for lean meat from progressively health conscious consumers, are considered drivers for change in carcass composition over time. Furthermore, many retailers trim visible fat from meat to various degrees and consumers increasingly remove visible fat from meat prior to, or after, cooking. The objective of this study was to determine the composition of South African Bonsmara beef from four age groups from different production systems, as well as to extrapolate the effect of fat trimming on physical composition. Fat content of marketable beef has decreased notably since the 1930s, and beef from the South African Bonsmara breed contains less than 10 g lipid per 100 g after trimming of subcutaneous fat, irrespective of age. Removal of all visible fat reduces the lipid content to less than 5 g per 100 g, comparing favourably with other lean animal products.Red Meat Industry. Red Meat Research and Development South Africa (RMRDSA), the National Research Foundation (NRF) THRIP. University of Pretoria Institutional Research Theme of Food Nutrition and Well-being.http://www.elsevier.com/locate/foodchem2017-02-28hb201

The important role of food composition in policies and programmes for better public health : a South African case study

Most governments have committed to the set of Sustainable Development Goals established by the United Nations (UN) to be achieved by 2030. Subsequently the governments have drafted, or are in process of drafting, policies and programmes which aim to answer to these global requests. South Africa provides a unique case study: despite economic growth, undernutrition has not improved when compared to other industrialised nations, while at the same time, diet-related non-communicable diseases and obesity have exponentially increased. Access to healthy food is a constitutional right of all South Africans, and towards increasing food security and improving population health, various policies, programmes and regulations have been developed and implemented by the government to rectify the situation. The paper presents an overview of food composition within these public health policies, programmes and regulations and unpacks the important role of accurate food composition data.http://www.elsevier.com/locate/foodchem2019-01-01hb2017Animal and Wildlife Science

Investigating consumer perceptions towards red meat classification

The South African carcass classification system for lamb, mutton, beef and goat (in use since June 1992) is based on the Agricultural Product Standards Act, 1990 (Act 119 of 1990) R 342 – Regulations Regarding the Classification and Marking of Meat. The carcass classification system could be viewed as a common language for all role-players in the value chain. It is an essential part of efficient animal production and plays a role in meat price determination. It also forms a basis for the utilisation of price differences and assists the industry in maximising consumer satisfaction through more consistent and specifically defined meat quality. From a consumer perspective the red meat classification system could enable consumers to select meat that aligns to their needs and preferences according to the characteristics within a specific class.https://journals.co.za/journal/vp.stockam2021Animal and Wildlife Science