Theses and dissertations (Applied Sciences)

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Development and optimization of technology for the extraction and conversion of micro algal lipids to biodiesel
(2015) Ramluckan, Krishan; Moodley, Kandasamy Govindsamy; Bux, Faizal
Fossil fuel reserves have been diminishing worldwide thus making them very scarce in the long term. These fuel sources and their by-products which are used commercially tend to produce large quantities of emissions. Some of them are believed to be toxic to flora and fauna. It is primarily for this reason that researchers worldwide have begun to seek out alternative sources of environmentally safe fuel. Biodiesel from algae is one of these sources that have been examined over the last few decades. Biodiesel has been produced from other plant-based material and waste oils in countries like America and Japan. However, the use of food based crops for biodiesel production has been challenged as it has an impact on food production on an international scale. Algae have only recently been investigated for their feasibility for biodiesel production on a large scale. The aim of this study was to investigate and develop technologies for biodiesel production from algae. The species of algae chosen were chlorella sp and scenedesmus sp., since they are indigeneous to Kwazulu Natal in South Africa. Samples were obtained from a local raceway pond and prepared for analysis. Drying protocols used freeze, oven and sun drying for initial preparation of the samples for analysis. Sun drying was the least energy intensive but most time consuming. At laboratory scale, oven drying was chosen as the best alternative. Lipid extraction methods investigated were the separating funnel method, the soxhlet method, microwave assisted extraction (MAE) and the expeller press. Thirteen solvents covering a range of polarities were used with the extraction methods to determine the efficiency of the solvent with these methods. Optimization of the MAE method was conducted using both the one factor at a time (OFAT) method and a design of experiment (DOE) statistical method. The shelf life of algal biomass was determined by ageing the samples for approximately three months. Direct and in-situ transesterification of lipid extracts to produce biodiesel was investigated using both acid and base catalysis. Qualitative and quantitative analyses were conducted using Fourier transform infra-red (FTIR) and gas chromatography (GC). Chemical and physical characterization of the biodiesel produced from the algal lipid extracts were compared to both local and international standard specifications for biodiesel. In terms of extraction efficiency, it was found that soxhlet and microwave assisted extraction methods were almost equally good. This was proved by the MAE method yielding an average of 10.0% lipids for chloroform, ethanol and hexane after 30 mL of solvent was used in an extraction time of 10 minutes, while the soxhlet method yielded 10.36% lipids using an extraction volume of 100 mL of solvent with an extraction time of 3 hours. Chloroform, ethanol and hexane were more efficient than the other ten solvents used. This was shown by these three solvents producing lipid quantities between 10% to 11% while all the other solvents produced lipid quantities between 2 and 10 %. The best extraction efficiency was achieved by the binary solvent mixture made up of chloroform and ethanol in a 1:1 ratio. Under the conditions optimized, this solvent ratio yielded a lipid content of 11.76%. The methods chosen and optimized for extraction are very efficient, but the actual cost of production of biodiesel need to be determined. Physical methods like the expeller press are not feasible for extraction of the type of biomass produced unless algae are pelletized to improve extraction. This will impact on the cost of producing biodiesel. The transesterification protocols investigated show that the base catalysis produced biodiesel with a ratio of saturates to unsaturates conducive to a good fuel product. The direct esterification method in this study proved to be better than the in-situ method for biodiesel production. The in-situ method was also more labour intensive. Chromatography was found to be a fast and efficient method for qualitative and quantitative determination of biodiesel. Characterization tests showed that the quality of biodiesel produced was satisfactory. It also showed that the methods used in this study were feasible for the satisfactory production of biodiesel which meets local and international specifications.
Development of a community engagement capacity building programme within a social justice framework for Consumer Science Food and Nutrition students at the Durban University of Technology
(2017) Grobbelaar, Hendrina Helena; Napier, Carin E.; Maistry, Savathrie
The focus of this study is to develop a capacity building programme that prepares students for service learning (SL) with the purpose of developing social responsibility and active critical citizenship underpinned by a social justice paradigm at a University of Technology (UoT). In developing countries such as South Africa that still experience severe injustices and inequality of access to, for example, certain services such as health services, it is impossible to ignore issues of human and social development and poverty reduction when promoting the university’s role in development. The developmental role of HEIs has been reinforced through the introduction and formalization of Community Engagement (CE) as a core function of higher education together with teaching and learning and research. When examining the role of universities in educating students for social responsibility and critical citizenship, it is evident that the biggest area of growth of CE has been in the form of Service Learning (SL) and community service. The study posits that in the South African context of HEIs, the potential for fostering, specifically critical discourse and creative thinking exists in what are termed as traditional universities because of the nature of the varied disciplines offered at these institutions. On the other hand, UoTs focused predominantly on the technical study field and on training students for the market place. The emphasis on Work Integrated Learning (WIL) and industry placements narrowed the focus and excluded insights into South Africa’s diversity and socioeconomic issues in the curriculum. The concept of social responsibility within a social justice paradigm is a foreign concept at UoTs in particular. To facilitate SL within a social justice paradigm and to address issues of injustice and inequality in SA at universities, the question that needs to be asked is: how should the preparation of students be shaped to adequately prepare them to become justice-orientated, socially and civically responsible students without compromising their work preparedness? This bigger question leads to the specific question of the study, which is: if the department of Food and Nutrition Consumer Sciences at the Durban University of Technology (DUT) is to develop justice orientated, socially and civically responsible students, what theoretical and philosophical considerations should guide the development of a SL capacity building programme? To achieve the purpose of the study the following objectives were identified: firstly, establish the effectiveness of the current preparation of Food and Nutrition students for SL to foster justice-orientated social and civic responsibility; secondly, determine the theoretical and philosophical considerations that should guide the development of students’ justice-orientated social and civic responsibility through SL in the field of Food and Nutrition; thirdly, develop and implement a SL capacity building programme to foster social responsibility and critical active citizenship within a social justice paradigm; finally, develop a framework for a social justice-orientated SL capacity building programme post evaluation A sequential exploratory mixed methods research protocol was applied in this study. The research process consisted of three phases. Phase I entailed the exploration of the research question with qualitative data collection (focus groups) and analysis. This phase was followed by a developmental phase (Phase II) during which the qualitative results and the theoretical and philosophical considerations evident in the literature were used to develop a capacity building programme. The programme was implemented and the impact of the programme was evaluated in Phase III through the application of the Civic Attitudes and Skills Questionnaire (CASQ). Purposeful sampling was applied in Phases I (qualitative phase) and III (quantitative phase). During phase I five focus groups were conducted (n = 43). Phase III sample consisted of two groups namely, the experimental group (n = 19) and a control group (n = 24). Focus group interviews were recorded and transcribed verbatim after which the data was coded followed by a thematic analysis. The data from the CASQ was captured on Microsoft Excel® and analysed according to CASQ scales using the Statistical Package for Social Sciences (SPSS) version 23 to determine mean and standard deviations. A paired sample 2-tailed t-test was used to determine statistical significant differences between the pre- and post-test. Results from phase I confirmed students’ understanding of CE is mostly a charitable view with little emphasis on addressing social justice issues. The results showed that SL as currently planned and executed seems to perpetuate and reinforce existing social hierarchies and paternalism. The most common expectation of participating in CE from students was to apply skills and theoretical knowledge in a community setting. Students also commented that they expected to be developed personally and to learn about others. Additionally, it is evident from the results that students did not indicate any changes in their social justice awareness. The programme developed in phase II was within the framework of four dimensions including self-awareness, awareness of others, awareness of social issues and change agent as critical to preparing students for SL with the purpose of fostering social responsibility and active critical citizenship within a social justice paradigm and guided by the Ubuntu philosophy, Freire’s critical pedagogy and Mezirow’s transformative learning theory. The results of phase III showed that the experimental group who participated in the capacity building programme showed a significant increase in the social justice related subscales indicating their intentions of future civic action and change in social justice attitudes. The results in the control group demonstrated a decrease in the mean values in the post-test for the social justice subscales. The experimental group also showed an increase in the interpersonal and problem-solving skills, leadership skills, diversity attitudes and course value subscales but it was not significant. An opposite pattern was demonstrated in the control group with significant decreases in the interpersonal and problem-solving skills, leadership skills, diversity attitudes and course value. The results showed the significant impact of the capacity building programme on students’ awareness and understanding of social justice issues. Overall, the findings of the various phases assisted in refinement of the framework for a social justice orientated SL capacity building programme. The developed framework consists of five key components: philosophy that guides social justice oriented service learning; theories that underpin service learning; a pedagogy that would effectively enhance a social justice oriented SL experience; and praxis that integrates theory and practice.
Food intake, socio-economic factors and health status of free-living, white residents living in an elderly residential facility in Morningside, Durban
(2020) Bodin, Shenaye Dale; Napier, Carin
Food intake patterns, socio-economic factors, health and nutritional status of free-living, white residents living in an elderly residential facility in Morningside, Durban. RATIONALE AND OBJECTIVE The objective of the study was to conduct an analysis of elderly people living in Morningside, Durban, KwaZulu-Natal, South Africa. The research focused on the socio-economic status, the dietary intake, the nutritional status and the health status of this community. METHODOLOGY The sample comprised 150 (125 women and 25 men) randomly selected white residents, residing in an elderly care facility located within ward 27 of Durban. The methods used for assessment included a socio-demographic questionnaire which determined their socioeconomic status. A 24-Hour recall questionnaire and a food frequency questionnaire were used to determine dietary intake, while anthropometric measurements were conducted to determine their nutritional status. A health questionnaire was used to determine the health status of the participants. Trained field workers and nurses assisted in the data collection and food consumption data was captured and analysed by a qualified dietician using the Food Finder version 3.0 computer software program. Descriptive statistics (frequencies, means, standard deviations and confidence intervals) were determined with the assistance of a bio-statistician. Socio-demographic and health data were captured onto an Excel ® spreadsheet by the researcher. These questionnaires were analysed using the Statistical Package for Social Sciences (SPSS) for Windows version 17, 0 software program. RESULTS The results indicated that most participants were not financially secure. Many of the participants were widowed and lived alone. A number of the participants relied on their pensions (31.3%, n=32) and very few had a job or any other source of income (6.7%, n=10). Most of the participants said that there was always enough money for food (80.0%, n=120). The BMI results showed that 39.3% (n=59) of the participants were obese. This was mostly observed in the women, where 40.8% (n=51) were obese. This can be linked to the high consumption of a carbohydrate-based diet and a lack of dietary diversity as well as possible lack of physical exercise; 35.3% (n=53) of men and women were of normal weight The nutrient analysis of the 24-Hour recall showed that there was a nutrient deficiency in energy, dietary fibre, calcium, iodine, phosphorus, magnesium and vitamin D. The total fat intake was slightly higher than the recommended intake by the WHO (15-30.0%), with men obtaining 32.4% and women obtaining 32.6% of energy from fat. Carbohydrates and dietary fibre contributed 48.1% for men and 49.3% for women of the daily energy needs for the group, slightly below the recommended 55-75.0%. The protein contribution to total energy intake was above the recommendation of 10-15.0% for both men and women. The men had an intake of 19.5% and the women had an intake of 17.9%. This shows that the average person ate a balanced diet in terms of macronutrients intake. Carbohydrates were the main source of food with the average amount consumed within the group being 152.7 g per day. This was above the recommended amount for this age group, which is 100 g per day. The most consumed sources of carbohydrates were bread or rolls, breakfast cereals, rice, potatoes and pasta. This could be due to the fact the residents received free bread from the facility every week. This bread was donated by a local bakery. These results indicated that the participants consumed a variety of foods but not in sufficient amounts needed to meet the daily recommended requirements. The fruit and vegetable consumption was high, with a mean intake of 219.7 g per person, but this is less than the amount needed to meet the recommendations for this age group. Consumption of dairy products was high, with the per capita intake for one day being 303.2 g for the group. This means that the average person consumed 303.2 g of dairy products a day. The main sources of dairy products consumed were milk, cheese, margarine and yoghurt. These high amounts are required for this age group due to weakening bones and the risk of osteoporosis; however, this rate of dairy consumption did not meet the calcium requirements for this age group. Health factors that were self-reported by the elderly included issues with the skeleton (47.3%, n=71), sensory organs (49.3%, n=74), and the heart or circulation (29.3%, n=44). Many reported suffering from other illnesses (42.6%, n=64) such as diabetes and high cholesterol CONCLUSION The results show that the community did not face poverty, food insecurity or any adverse social factors such as lack of money or food choices. There was a relatively high number of obese participants (39.3%); therefore these participants were classified as malnourished. There needs to be a nutritional intervention aimed at changing the food-purchasing choices of the elderly, and placing emphasis on healthier food preparation and reducing the high level of carbohydrate intake as well as encouraging physical activity.
Food security and coping strategies of an urban community in Durban
(2016) Mtolo, Andile; Napier, Carin E.
Introduction: Food and Agriculture Organisation (FAO 2015a) estimated that 220 million people (23.2%) in Sub-Saharan Africa were undernourished. Parallel to hunger, obesity rates have more than doubled globally since 1980; in 2014, 1.9 billion adults in the world were overweight and 600 million were obese (FAO 2015a). Obesity is a serious concern facing the world today and a major contributor to chronic disease such as diabetes and cardiovascular disease, which are often fatal (Bray, Frühbeck, Ryan and Wilding 2016: 1947). In South Africa, overweight and obesity have reached unacceptable numbers as over 60% of South Africans are overweight or obese. Furthermore, in 2015 South Africa was declared the fattest nation in Sub-Saharan Africa, adding another burden to the HIV epidemic (Ng, Fleming, Robinson, Thomson, Graetz, Margono, Mullany, Biryukov, Abbafati and Abera 2014: 777). Unemployment is one of the major factors that drive household food insecurity due to the fact that most people access food commercially. Therefore, income is a significant factor in ensuring that a healthy and nutritious diet is consumed regularly. The study community was at Umbilo, Durban, KwaZulu-Natal in a government owned estate called Kenneth Gardens. The estate has 286 units and accommodates approximately 1500–1800 residents. It formed part of an extensive network of cluster housing schemes developed by the apartheid government as a protectionist strategy to provide safe and affordable housing for poor and working class whites. Kenneth Gardens is currently managed by KwaZulu-Natal (KZN) Province and offers subsidized housing to residents from diverse background. Residents are low income bracket earners and many rely on state disability and pension grants for survival. Kenneth Gardens faces a wide range of social problems such as alcohol, drug abuse, domestic violence, unemployment and limited access to education (Marks 2013:26). Aim: The aim of the study was to determine the food security status, coping strategies, food intake and the nutritional status of the Kenneth Gardens community, which is situated in an urban area in KwaZulu-Natal. Methodology: One hundred and fifty (n=150) randomly selected caregivers participated in the study. The sample size was calculated using a power calculation indicating that 150 participants represent a reliable sample. The sampling procedure was simply random sampling. This study was quantitative and partly qualitative and descriptive in nature therefore, different measuring instruments were used to collect relevant data. The research tools for various variables measurements included; food security questionnaire, anthropometric measurements, a socio-demographic questionnaire, a food frequency questionnaire, and 24-hour recall questionnaires conducted in triplicate. Food security coping strategies were documented through a focus group interview with the Kenneth Gardens community members to determine strategies used to address food scarcity. All participants were weighed and measured to determine body mass index (BMI), classified according to the World Health Organisation (WHO) cut-off points. Data for socio demographic, FFQ, anthropometric measurements, and coping strategies was captured by the researcher on Excel® Spread sheets and analysed by a statistician for descriptive statistics using the Statistical Package for the Social Science (SPSS) version 17.0. Data for the 24-hour recall was captured and analysed by a nutrition professional using the MRC Food Finder® version 3.0 software, based on the South African composition tables. Results: The study population consisted of 150 households, including women (n=122) and men (n=28). The results revealed that the majority of households (52.7%, n=79) were headed by a mother, and only 40% (n=60) of households were headed by a father. Majority (47.3%, n=71) of the participants had completed matric and 7.3% (n=11) had tertiary education. English, (52%, n=78), was the most spoken home language, followed closely by Zulu, (43.3%, n=65). Thirty six percent (n=54) of the participants were unemployed and 26.7% (n=40) were employed; however over, 50% (n=40) of the employed participants were temporary. Twenty eight percent (n=42) of the participants earned less than R3000.00 per month and 31.3% (n=47) earned between R3000.00 and R6000.00 per month. Pensioners were 17.3% (n=26), who therefore received a government grant that ranges between R1500 and R1520 per month depending on the claimant’s age. The average household income was reported as R4429.20. The average number of people in the household was five, which equates to R6.00 per person per day. The results also revealed that 38% (n=57) of the household had a sole contributor to the household income; other households had two contributors (42.7, n=64) and 11.3% (n=17) had three contributors. Urban South Africans tend to purchase food as opposed to growing their own food. A lack of purchasing power results in food insecurity that eventually leads to malnutrition. The majority (56.6%, n=85) of the participants indicated a shortage of money to buy food and this inevitably leads and drive utilisation of coping strategies with high severity rate during periods of food scarcity. Bulk food was purchased once a month by the majority (68%, n=102) of the participants. The most commonly used coping strategy during periods of food scarcity was “Rely on less expensive and preferred food” with the mean score of 4.56 (±SD 2.772). The second used coping strategy was “Reduce the number of meals eaten in a day” with a mean score of 3.85 (±8.163), followed by “Contribute to a food stokvel in order to ensure food over a scarce period” (3.31, ±7.505) and “Restrict consumption by adults in order for small children to eat” (2.24, ±5.333). Utilisation of these food coping indicate a degree of food insecurity. The Body Mass Index (BMI) classification indicated that women had a higher (31.46 ±8.474) BMI than men (26.00±5.445). A total of 26.2% (n =32) women were overweight and 51.7% were obese category I, II and III. The mean BMI for the whole group was (30.44±8.261) which clearly demonstrated obesity. Nonetheless, men were not overweight; however 25% (n=7) were obese category I. Collectively, underweight was prevalent in women (3.3%, n=4) and men (3.6%, n= 1). The Food Variety Score was medium (31.91, ±10.573), which indicated a consumption of 30- 60 individual foods from four to five food groups during the seven day period; however the top 20 foods consumed from the 24-hour recall revealed that the diet was energy dense and the most consumed foods were primarily from the carbohydrate and fat group and a low consumption of fruits and vegetables was reported; hence the nutrient analysis showed a deficient intake of several nutrients, such as: calcium, vitamin A, zinc, vitamin D, vitamin E, vitamin K, zinc, magnesium, phosphorus, selenium and thiamine by both men and women. According to the WHO dietary factor goals, the acceptable macronutrient distribution ranges (AMDRs) and fruit and vegetable intake based on the 24-hour recalls, fat and protein intake exceeded the recommended 15-30 percent goal. Fruit and vegetable intake was very low in comparison to the minimum recommended intake of >400g. Carbohydrates intake for women were within the recommended 55-75 percent; however, men aged 19-50 years (50.70%) and >50 years (53.74%) did not meet the recommended intake. Conclusion: The results of this study reveal that the nutrition status of this community was compromised. The top 20 food intake indicated inadequate eating patterns and that diets comprised of energy dense foods, such as carbohydrates and fats, which could directly be responsible for the high obesity levels of >50% in women and >25% in men. Furthermore, there was low income and a high unemployment rate that proliferates the prevalence of food insecurity, hence the coping strategies reported. Malnutrition exists in communities as a result of food and nutrition insecurity which is affected by a significant number of factors that need to be considered and addressed. Nutrition interventions and nutrition education on a balanced diet, healthier methods of preparing food, and physical activity are required to ensure and improve health status, quality of life and better and sustainable coping strategies for our communities.
Relationship between diet quality, nutrition status and academic performance of first and non-first generation university students in Durban
(2017) Ndlovu, Ntombenhle Pretty; Napier, Carin E.; Mkhize, Xolile N.
Introduction: Many studies have attempted to establish the association between the academic performance of university students and various factors that impact on academic performance. Students’ socio-economic backgrounds have been cited as a significant predictor of academic success among university students, with first generation students (FG) reporting a lower retention and graduation rate compared to non-first generation (NFG) students. First generation students are those that are the first in a family to enroll in institutions of higher learning, whether college or university, while NFG students, are students whose parents or siblings have attended an institution of higher learning. The low academic success rate among FG students is mainly attributed to unpreparedness for college/university, financial challenges and lack of support from family. Aim: The aim of the study was to determine the relationship between diet quality, nutrition status and academic performance of first generation and non-first generation university students in Durban. Methodology: A total of 270 randomly selected students (135 FG and 135 NFG) between the ages of 18 and 30 years participated voluntarily in the study. The study was descriptive in nature with a cross-sectional design. Trained fieldworkers administered the questionnaires in an interview setting. A socio-demographic questionnaire measured the socio-economic characteristics of the students; anthropometric measurements were used to determine the nutritional status against the WHO cut-off points; three 24 hour recall questionnaires and a food frequency questionnaire determined their diet quality and nutrition adequacy, and the students’ matric and first year results were used to measure academic performance. The socio-demographic questionnaire, anthropometric measurements and the academic results were captured on Microsoft Excel® and analyzed using the Statistical Package for Social Sciences® (SPSS) version 21.0. A trained nutrition professional captured and analyzed the 24 hour data using the Food Finder® version 3 computer programme. Results: The sample was fairly representative of both groups of students and genders with 20% (n=52) FG men, (17%; n=44) NFG men, (30%; n=78) FG women, and 33% (n=86) NFG women. The majority of FG (63.1%; n=82) and NFG (59.2%; n=77) students came from townships, and the highest number of students (FG 60.7%; n=79 and NFG 49.3%; n=64) depended on student loans to pay for university fees. Furthermore, most of the FG (76.8%; n=100) and NFG (81.5%; n=106) students lived in university residences. Although the highest number of FG students (38.5%; n=50) had a household income of between R0–R500 compared to the highest number of NFG students having a household income of R501–R1000 per month, the highest number of both groups of students (FG=25.4%; n=33 and NFG=26.2%; n=34) spent R401–R500 per month on food, and almost 50% of both groups of students indicated that they sometimes lacked money to buy food. Non-first generation students were affected by obesity more so than FG students, with one (2.27%) NFG man and 13.92% (n=12) affected by obesity class I (BMI 30-34.99), and 4.65% (n=4) NFG women falling within the obesity class II range (BMI of 35-39.99), compared to none of the FG men affected by obesity, and only 3.85% (n=3). Furthermore, a higher number of NFG students exceeded the WC cut-off points for men (102cm) and women (88cm) compared to FG students, with none of the FG men exceeding the cut-off points for men, compared to 1.82% of NFG men, and only 20.51% of FG women exceeding the cut-off points for women compared to 32.61%. The waist-to-height ratio also indicated that a higher percentage (63.74%) of NFG women exceeded the cut-off point (˃0.5) compared to 60.25% of FG women. Refined carbohydrate based foods made up the majority of the students’ diet, with the top 3 foods among FG and NFG men being carbohydrate based (maize meal pap, bread/rolls, and rice), and the top two foods being rice and bread/rolls among FG and NFG women. All the students (FG and NFG), failed to meet the WHO’s recommendation of consuming ≥400g of fruits and vegetables. Furthermore, between 80-100% of men and women (FG and NFG) failed to meet the RDI’s for calcium, magnesium, and vitamins C, D, E and K. Although both FG and NFG students reported few protein rich sources on the top 20 foods lists, all the students exceeded the DRI for protein with mean (SD) intakes of (62.62g±21.984) by FG men, 70.98g±25.534 (NFG men), 57.97g±23.248 (FG women), and 55.94g±18.397 (NFG women). Carbonated drinks were ranked 6th for both FG and NFG men, and 8th among FG and NFG women, with NFG men reporting a higher per capita intake per day (142.52g) compared to FG men (115.67g) and among women, a per capita intake of 106.07g (FG) 96.95g (NFG). Both FG and NFG students reported low food variety scores (<30 individual foods), with FG men reporting a slightly higher mean (SD) FVS (28.56±10.079) compared to 27.41±10.342 of NFG men, and NFG women reported a higher mean (SD) FVS (29.92±8.549) compared to 28.67±10.775 (FG women). The majority of the students (FG and NFG) reported high food group diversity scores (FGDS), with the majority of men (FG=98.08%; n=51 and NFG=93.18%; n=41) and women (FG=94.9%; n= 74 and NFG=100%; n=86) reporting a high FGDS (6-9 food groups). The matric results of the participants indicated that 100% (n=260) of all the students (FG and NFG) passed matric with a pass rating of 3-6, and the first year academic results indicated that the highest number of FG and NFG students passed the first year of university with a percentage range of 51-74% [FG men=92.31(n=48); NFG men=86.36 (n=38); FG women=93.59% (n=73); and NFG women=84.88 (n=73)]. The first year results also showed that a higher number of NFG (11.36%; n=5) men and women (10.47%; n=9) failed the first year of university compared to the FG men (5.77%; n=3) and women (5.13%; n=4). Conclusion: Although there are some statistically significant correlations between some of the variables, it does not prove conclusively that diet and nutrition status had an impact on the academic performance of this group of students. Due to the lack of diversity with regard to socio-demographic factors, including socio-economic profile and race, no notable differences were observed except in the case of nutrition status, where a higher incident of obesity was observed among NFG students compared to FG students. Inter-gender differences were more apparent compared to inter-generation differences.
Situational analysis of free-living elderly in Umlazi township
(2011) Mkhize, Nkumbulo Xolile; Oldewage-Theron, Wilna; Napier, Carin E.
The objective of the study was to conduct a situational analysis of elderly people on state pension living in Umlazi, KwaZulu-Natal South Africa. The research focused on the socioeconomic status, dietary intake, nutritional status, and health status of this community. Methodology The sample comprised 270 (224 women and 46 men) randomly selected elderly people within the 12 wards of Umlazi. The methods used for assessment included a sociodemographic questionnaire which determined the socioeconomic status. A 24-hr recall questionnaire and food frequency questionnaire were used to determine dietary intake, while anthropometric measurements were conducted to determine the nutritional status. A health questionnaire, including a salt administration questionnaire was used to determine the health status of the elderly in this community. Trained field workers and nurses assisted in data collection and food consumption data was captured and analysed by a qualified dietician using Food Finder version 3.0 computer software program. Descriptive statistics (frequencies, means, standard deviations and confidence intervals) were determined with the assistance of a bio-statistician. Socio-demographic and health data were captured onto an Excel(R) spreadsheet by the researcher. These questionnaires were analysed using the Statistical Package for Social Sciences (SPSS) for Windows version 17, 0 software program. Results The majority of respondents lived in brick houses (84.8%) and the living space generally consisted of more than three rooms (87.4%). However, the majority of respondents who lived with >4 to 10 members were 67.4% whilst only 32.6% of households consisted of less than 4 members. The mean household size was 5.1 (±SD 2.9) people, this further illustrates that the majority of respondents lived with 5 people per household. Grandchildren were present in 70% of the households with a mean of 3 (±SD 5) grandchildren in each household. Results also indicate that 84.6% of the elderly were the bread winners in these households. The vast majority of 87.8% of the population had no other source of income. The majority of vi Pagevi respondents with an income had a total monthly income of R500- R1500 (82.9%) followed by R1501- R2500 (14.1%) and only 3% had more than R2500 total income. Food expenditure for most (80%) households was >R500 of the total income. Food shortages due to limited income were frequent in 54% of households who regularly experienced this problem, whilst 26% sometimes experienced shortages, 15.4% often encounted shortages whereas 2.6% encounted shortages seldomly and 2.2% never. A large majority of respondents owned electrical assets, the most commonly owned included a televison (80.3%) , a radio (75.5%) and a refrigerator (75.1). The majority of food items consumed were carbohydrate based and the portion sizes were relatively big, on average 1348.5g per day. The energy contribution from carbohydrates was 65% which is considered to be on the high side (WHO goals 55-75%). Protein intake was fairly common, with a 15% contribution to energy from total protein (WHO goals 10-15%). The frequency of vegetable and fruit intake was very low, the portion sizes were also small and did not meet the recommended daily intake. The energy contributions showed that 89.2% of the women consumed a diet that supplied <100% of Estimated Energy Requirements (EERs) and all the men consumed <100% of the EERs for energy. Sixty three percent of the women and 91.1% of the men consumed <100% of the EARs for protein. The mean carbohydrate intake in the sample was significantly higher than the EAR but the women consumed <100% of the EARs for carbohydrates (4.1%) and all men consumed >100% of the EARs. The majority of the vitamins for both genders indicated low intakes except for vitamin B12 and B6 in the case of men only. The majority of minerals indicated low scores for micronutrients except for iron (36.6% for men) and potassium (39.0% for men) which was consumed mostly by men than women. The mean Food Variety Score (FVS) (±SD) for all the foods consumed from all the food groups in a period of seven days was 25.8 (±14.6). The results revealed poor dietary diversity scoring. The cereal group had the highest mean variety score 5.3 (±2.5) followed by vegetables 4.5 (±2.6), fruit 3.5 (±3.1), flesh foods 3.2 (±1.6), vitamin A-rich fruit and the vegetable group 3.1 (±1.7). The anthropometric indices indicated that the mean age was 69.7 years (±SD 7.1) and mean weight of 76.5 kg (±SD 17.3). The BMI scores for the total group indicated that 52% of the respondents fell into the obese category (BMI = obese 1 >30, obese 2 >35 and obese 3> 40) and 24% of the respondents were overweight (BMI = 25-29.9). Only 20% were of moderate weight (BMI 18.5- 24.9). Although more men were overweight (34.2%) compared to 21.9% vii Pagevii of women, more women (60.1%) were obese compared to men (18.8%). The majority (83%) of the women were above the cut-off points for waist circumference ( 88cm) and 17% were within the normal values whilst 74% of the men were within recommended cut-off points ( 102cm) and only 26% exceeded the recommended scores. The results indicate that 77% of respondents were at risk of developing metabolic syndrome exceeding >0.5 waist-to-heightratio (WHTR) and 23% were at lower risk. However, the women showed a higher risk of 87.4% and men only 47.9% for metabolic risk. The correlation was significant at the p=0.01 level. There was thus as highly significant relationship between BMI and WHTR ratio for women. The health survey results indicated that 90% of the elderly population were in various stages of hypertension and 6% showed signs of developing hypertension. However, hypertension was more prevelant in women (91%) than in the men (83%). There was a statistical significant correlation (p=0.01) between waist circumference and systolic pressure for both women and men. A high percentage (82%) of the participants reported that they were currently on chronic medication whereas 18% were not using any chronic medication at the time. Although hypertension was prevalent in most respondents, it was followed by self reported diabetes (26.7%) and cancer (1.9%). Results show that elderly experienced problems with following ereas in the body skeletal joints (72.6%) as well as eyes and teeth were problematic in 75.9% of the respondents, followed by skin problems (29.6%) and ears and nose problems (28.6%). Results in the salt administrative questionnaire indicate that sodium intakes were below WHO goals <2000mg. Results also show that a high percentage of respondents (60%) generally never added salt to cooked food as the majority saw it as a health risk. Only 13% added it always to cooked food and 21% added it sometimes. Conclusions The results in the study indicate the high prevelance of poverty, food insecurity and poor nutritional and health status that compromises the quality of life of elderly living in this community. Recommendations Long-term intervention studies must be prioritised to address economic, health, social and demographic factors and future research is needed to cater for the growing needs of this population group.