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1.1 Background Information
Antioxidant rich food intake is the main contributor of micronutrient deficiencies in the developing world especially in population with low intake of animal protein foods such as meat and dairy products. World Health Organization (WHO) (2003) estimated that low intake of antioxidant rich food caused about 19% gastro- intestinal cancers, about 31% of ischemic heart disease and 11% of stroke. Of the global burden attributable to antioxidant rich food consumption, about 85% was from Cardiovascular Diseases (CVD) and 15% from cancers. It estimated that about 2.7 million deaths were recorded yearly arising from these chronic diseases.
The implication of the emerging scenario is that 2.7 million lives could be saved each year with sufficient global antioxidant rich food consumption. According to the WHO/FAO (2003), the set population nutrient goals and recommended intake was put at a minimum of 400g for antioxidant rich food per day for the prevention of chronic heart diseases, cancer, diabetes and obesity. The report also stated that there was convincing evidence that antioxidant rich food decreased the risk of obesity and evidence abound also that they probably decreased the risk of diabetes. Furthermore, there is convincing evidence that antioxidant rich food lower the risk of CVD.
Micro-nutrient deficiency resulting from antioxidant rich food intake has been associated with various economic consequences. This is exemplified in a study in Ethiopia, (Croppenstedt and Muller, 2000). The result showed that nutritional status affected agricultural productivity and elasticities of labour productivity. Thus proving that there is a significant link between health and nutritional status and agricultural productivity.
However, in spite of this growing body of evidence highlighting the protective effects of antioxidant rich food, their intakes are still grossly inadequate both in developed and developing countries (IARC, 2003).
Analyses of family budgets suggest that the poorer the family, the greater is the proportion of the total expenditure on food thus obeying Engel’s law (Blissard et al, 2003). Engel's Law states that as income rises, percentage of income spent on consumption rises slower as compared to rise in income. According to (Blissard et al, 2003), many analyses of family budgets conclude that the proportions of income devoted to various groups of commodities not only change with increasing income as stated in Engel’s law but also vary
Antioxidant rich food have been known to exhibit substantial heterogeneity with regard to demand, supply and trade characteristics (Damianos and Demoussis, 1992). On the demand characteristics, most antioxidant rich food exhibit higher income elasticities than that for overall food consumption. This implies that as income rises, the share of antioxidant rich food within the food budget also rises. The overall demand for antioxidant rich food are income elastic despite the relatively high share of antioxidant rich food in the food budget.
Antioxidant rich food production are characterized by a strong seasonal dimension, leading to substantial price fluctuation and income instability during the marketing period. This is basically because as horticultural plants, they exhibit price elasticity supply responses. A small increase in price can result in huge production increases (Damianos and Demoussis, 1992). If prices were allowed to fall to accommodate the increased supply, antioxidant rich food that exhibit inelastic demand would record a reduction in income. If, on the other hand, the demand is elastic, a drop in prices caused by increased supply will be followed by a more than proportional increase in the quantity demanded (Bergman, 1984). Low income middle age adults are more responsive to price changes for vegetables, but less responsive to fruits (Dong and Lin, 2009). On the other hand, it is estimated that most countries in the sub- Saharan Africa have income elasticities for fruits greater than the elasticities for vegetables (Ruel et al, 2004).
1.2 Problem Statement
Lack of antioxidant rich food intake is among the top risk factors contributing to about 2.7 million deaths globally (WHO, 2003). In Nigeria, micronutrient malnutrition has been identified as a wide spread problem with serious economic consequences. These include, cognitive losses, work losses, low productivity, etc (Adish, 2009). This dismal picture of the micronutrient status spells serious consequences. In fact, estimated levels of current antioxidant rich food intake vary considerably around the world ranging from levels less than 100g/day in less developed countries to about 450g/day in Western Europe (WHO, 2003). Internationally, representative data on antioxidant rich food consumption in 21 countries, most of which are from the developed world, show that average intake reached the WHO/FAO minimum recommended level of 400g per capita per day (Israel, Italy and Spain) (IARC,2003). Specifically, in Nigeria, the 2007 estimated production of antioxidant rich food was 977.799 million tonnes and 8.082 million tonnes, while their consumption was estimated at 15.44 g/capita/day and 47.52 g/capita/day for antioxidant rich food respectively (FAO, 2008).
In Enugu State, statistics showed that between 2001 and 2007, 4.364 million tonnes of vegetables were produced (PCU, 2008). However, there are no available statistics for fruit production as well as their consumption in the area. In a study (Kushwala et al, 2007), only the determinants of vegetable consumption was considered. The study did not consider fruits as well as their various elasticities. From the fore going, certain questions come to mind: What are the types and quantities of antioxidant rich food consumed by the middle age adults? What are the share of antioxidant rich food in the household’s food budget? What are the factors that shape consumption behaviour in relation to antioxidant rich food?
The diets of urban dwellers are generally more diverse than those of their rural counterparts (Regmi and Dyck, 2001; Ruel and Garret, 2003; Smith et al, 2003; Smith, 2004). It is believed that this is due to a combination of factors including the availability of a wider variety of foods in urban markets, the availability of storage facilities, changes in life styles and cultural patterns and the need for convenience leading to the purchase of more processed food. According to Fabiosa and Soliman (2008), urban middle age adults show larger differentials in the elasticities for food and non-food items with much smaller elasticities for the food categories. Rural middle age adults on the other hand, show higher elasticities in the food categories, especially for meat, fish and dairy. However, urban middle age adults are less responsive to income changes than are rural middle age adults in the food categories; and more responsive in the non-food category.
Hence, this study to examine the patterns and determinants of antioxidant rich food consumption in the urban and rural areas of Enugu State, Nigeria.
1.3 Objectives of the study
The broad objective of this study was to evaluate the patterns and determinants of antioxidant rich food consumption in urban and rural areas of Enugu State,
Nigeria. The specific objectives were to:
i. To describe the middle aged adult consumption patterns in Enugu State in relation to the socio-economic attributes;
ii. describe the types and quantities of antioxidant rich food consumed by the middle aged adult;
iii. To compare the consumption patterns in urban and rural areas of the state;
iv. estimate the share of antioxidant rich food in the middle aged adult food budget;
v. analyze the determinants of demand for antioxidant rich food in the state;
vi. compare the demand elasticities of these antioxidant rich food in urban and rural areas by middle aged adults.
The following null hypotheses were tested;
HO1. there is no significant difference between the consumption of antioxidant rich food in urban and rural areas by middle aged adults of Enugu State of Nigeria;
HO2. the determinants of the consumption of antioxidant rich food are not the same in urban and rural areas;
HO3. there is no significant difference in the demand elasticities for antioxidant rich food in urban and rural areas of Enugu State; and
HO4. Middle aged adults’ socio-economic characteristics have no significant effect on the consumption of antioxidant rich food in the study area.
1.5 Justification for the study
It is known that antioxidant rich food consumption is among the top 20 risk factors contributing to attributable mortality and up to 2.7 million lives could be saved each year with sufficient global antioxidant rich food consumption. This excludes, however, vitamin A deficiency (VAD), iodine deficiency diseases (IDD) and iron deficiency anaemia (IDA). Abundant intake of antioxidant rich food is clearly a positive solution to problems of poor diet quality in the developing world. They are relatively cheap sources of essential micronutrients and are therefore a cost effective way to prevent micronutrient deficiencies and protection against the main killers associated with micronutrient deficiencies in the world today.
Many previous studies have addressed socio-economic differentials in the nutritional status of people in either rural or urban areas (Levin, 1996; Prasad and Prasad, 1991). However, the magnitudes of socio-economic differentials in rural and urban population have seldomly been compared. The danger of using such comparisms according to Menon et al, (2000) is that they mask the enormous differentials that exist between socio-economic groups in both urban and rural areas. It is expected that the study will:
Firstly, help to broaden the understanding of middle aged adults on factors that influence the demand for antioxidant rich food in urban and rural areas in Enugu State. The result will assist in the promotional efforts to foster antioxidant rich food consumption in future. This is because these efforts can only be sustainable if such factors were properly analyzed.
Secondly, help create awareness on the need for the consumption of locally available antioxidant rich food bearing in mind the essential benefits of antioxidant rich food to human health. The study will also suggest strategies for improving antioxidant rich food consumption among the two demographic divide in Enugu State, vis-a-vis the nutritional and economic importance of antioxidant rich food.
Again, the findings will go a long way in providing information to guide future policy initiatives to promote and facilitate greater consumption of antioxidant rich food in the study area and help policy makers in planning and managing micronutrient malnutrition problems. Finally, it will help other researchers wishing to go into related areas of study.
1.6 Limitations of the Study
The following challenges were faced in the course of this study:
1. Some of the respondents particularly, those in the rural areas were not able to say for sure the quantity of each of the antioxidant rich food consumed in standard measurements, example, kilogrammes, and grammes. Given this, the enumerators had to rely on verbal descriptions as reference measures.
In some areas, during the collection of the data, the enumerators had to visit many times before they could be attended to. This became so worrisome because these respondents had earlier indicated interests to participate in the exercise when reconnaissance visits were made to the areas.
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