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Diet and mortality rates in Sub-Saharan Africa: Stages in the nutrition transition

BMC Public Health volume 11, Article number: 801 (2011) Cite this article

Abstract

Background

During the last century we have seen wide-reaching changes in diet, nutritional status and life expectancy. The change in diet and physical activity patterns has become known as the nutrition transition. At any given time, a country or region within a country may be at different stages within this transition. This paper examines a range of nutrition-related indicators for countries in Sub-Saharan Africa (SSA) and attempts to develop a typical model of a country in transition.

Methods

Based on the availability of data, 40 countries in SSA were selected for analysis. Data were obtained from the World Health Organisation, Demographic and Health Surveys and the Food and Agriculture Organisation of the United Nations. Multiple linear regression analysis (MLRA) was used to explore the determinants of infant mortality. A six point score was developed to identify each country's stage in the nutrition transition.

Results

MLRA showed that underweight-for-age, protein and the percentage of exclusively breastfed infants were associated with the infant mortality rate (IMR). The majority of countries (n = 26) used in the analysis had nutrition transition scores of zero and one. Most of them had a high prevalence of infant mortality, children that were stunted or underweight-for-age, small percentages of women that were overweight and obese, and low intakes of energy, protein, and fat. Countries with the highest scores include South Africa, Ghana, Gabon, Cape Verde and Senegal which had relatively low IMRs, high levels of obesity/overweight, and low levels of underweight in women, as well as high intakes of energy and fat. These countries display classic signs of a population well established in the nutrition-related non-communicable disease phase of the nutrition transition.

Conclusions

Countries in SSA are clearly undergoing a nutrition transition. More than half of them are still in the early stage, while a few have reached a point where changes in dietary patterns are affecting health outcomes in a large portion of the population. Those in the early stage of the transition are especially important, since primordial prevention can still be introduced.

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Background

Developed (high-income) and developing (low-to-medium income) countries differ significantly in causes of death. The leading causes of mortality in developed countries are non-communicable diseases (NCD) such as type 2 diabetes, cardiovascular diseases and cancer which account for approximately two-thirds of all deaths [1]. However, these diseases account for only one-third of deaths in the developing world, where infectious diseases and malnutrition, particularly in infants, account for up to 43 percent of deaths [1]. Furthermore, NCDs that used to be associated with old age in high-income countries are becoming more prevalent in the developing world following the rapid increase in industrialization, urbanization, economic development and globalization [1].

During the last century we have seen wide-reaching changes in diet, nutritional status, disease patterns and life expectancy. These changes are thought to occur as three separate transition processes. The demographic transition refers to a change from a period of high fertility and mortality to one of low fertility and mortality which occurs as a result of an increase in income, education and employment [2], while the epidemiological transition refers to a change from a period of high prevalence of infectious disease associated with poor sanitation, famine and malnutrition, to a period of high prevalence of chronic and degenerative diseases [3, 4].

A period of transition thought to precede or occur simultaneously with the demographic and epidemiological transitions is the nutrition transition, resulting from a change in diet and physical activity patterns [5]. Popkin refers to this transition occurring in five stages.

During the first stage (hunter-gatherer), diets were high in carbohydrates and fibre and low in fat (especially saturated fat). Activity levels were high, and obesity levels low. The second stage (famine) refers to a period where food was scarce and dietary diversity low. While the type of physical activity done may have changed, the activity levels remained much the same. These changes are related to a shift toward settlements and cultivation, first of crops and later also livestock and poultry. During the third stage (receding famine), the amount of carbohydrates in the diet decreased, and fruit, vegetables and protein consumption increased. Physical activity levels started to decrease. This is the development of more technically advanced and productive agriculture. The fourth stage (nutrition-related non-communicable disease) is characterized by a diet high in fat, refined carbohydrates, sugar and cholesterol and low in fibre. Physical activity levels are low, and obesity prevalence high. The final stage (behavioural change) occurs due to a desire to prolong health and delay or prevent degenerative diseases. The consumption of complex carbohydrates, fruit and vegetables increases, while the consumption of fat, processed foods, meat and dairy products are reduced [4–6]. At any given time, a country or region within a country may be at a different stage within this transition.

While most high-income, developed countries seem to be in the final stage of the nutrition transition [5]; developing countries [6] have not been immune to this transition. Poor countries are plagued by the same risk factors (diets high in sugar, fat and alcohol, obesity, tobacco smoking and lack of physical activity) as their rich counterparts [7]. Furthermore, rural and urban areas within the same country may be at different stages of the transition.

Urban residents have access to a wider range of food products, many of which are high in fat and sugar. In addition, an increasing number of women are working, leaving less time for growing and producing food, shopping for ingredients, and preparing the often energy-intensive staples of traditional diets. Families therefore rely on processed foods, resulting in the development of obesity [1]. This is further exacerbated by the sedentary activities associated with urban jobs and the increase in the availability of televisions and computers.

Sub-Saharan Africa (SSA), made up of low- and middle-income countries, is undergoing a health transition causing these countries to experience a double burden of disease. The nutrition transition appears to be accelerating in SSA from the receding famine stage to the nutrition-related non-communicable disease stage. As a result, an increasing number of households are experiencing the dual burden of underweight and obesity occurring simultaneously [8, 9]. At the same time high rates of NCDs, like diabetes, cardiovascular disease and cancer are occurring together with infectious diseases such as HIV/AIDS, tuberculosis and malaria [10].

Community studies from South Africa [11, 12] have found that underweight and stunting coexist with overweight and obesity. In a study by Garrett and Ruel [13], using demographic and health survey (DHS) data from several developing countries, the relationship between stunted children and overweight and obese mothers was confirmed. In SSA, the percentage of stunted children with overweight mothers ranged from 0.6% in Mozambique to 8.2% in Namibia.

Countries in SSA are currently experiencing changes associated with the advancing nutrition transition, while at the same time struggling to eradicate the high prevalence of infant and child mortality prevalent in developing countries. This paper examines the role of a number of indicators associated with the advancing nutrition transition, as well as the prevalence of infant mortality and the factors impacting on its prevalence in SSA.

In this paper we hypothesise that countries in the advanced stage of the transition have adopted 'western' diets and are now plagued by high levels of overweight and obesity, and high levels of NCD mortality. They generally have fewer people living in poverty. Moreover, their levels of underweight-for-age, stunting and IMR may have decreased. Based on this hypothesis, a scoring system was developed and used to define a typical model of a country in transition.

Methods

The current study is a secondary analysis of existing data available on IMR and mortality due to chronic NCD (NCD MR) in SSA, as well as their determinants. Forty countries in SSA were selected based on the availability of data from primary sources World Health Organisation (WHO) [14], Demographic and Health Surveys (DHS) [15] and the Food and Agriculture Organisation of the United Nations (FAO) [16]. Nutrition-related indicators which may have influenced the nutrition transition, as well as indicators associated with infant and child mortality were selected from the data available. A list of the key indicators and their definitions is shown in Table 1.

Table 1 Definition of key indicators
Full size table

The most recent data (2000-2008) from the WHO Global Health Observatory Database [14] were used to obtain information on each country's IMR, the percentage stunting, underweight-for-age, low birth weight and exclusively breastfed infants, NCD mortality, prevalence of HIV among adults, and the percentage of the population living on less than one dollar per day (PPP). Zere and McIntyre [17] provided information on the prevalence of stunting and underweight in South African children younger than five years.

Country reports from the most recent DHS [15] were used to obtain information on mean Body Mass Index (BMI) of adult women. BMI was stratified into the percentage of women who were underweight (BMI < 18.5), were within the normal weight range (BMI = 18.5-24.9), or were overweight and obese (BMI > 25).

The 2008 food balance sheets from FAO [16] were used to gather information on dietary energy supply (DES), protein and fat per capita available in each country. The information obtained was used to generate values for carbohydrate supply. In addition, values for the percentage of energy from protein [(grams of protein ×4 calories) ÷ (calories of energy ×100)], fat [(grams of fat ×9 calories) ÷ (calories of energy ×100)] and carbohydrates [(grams of carbohydrates ×4 calories) ÷ (calories of energy ×100)] were calculated.

The IMR was selected as an independent variable. Pearson and Spearman correlations were then used to identify associations between IMR and various predictor variables. Multiple linear regression analysis was used to explore the determinants of IMR using possible predictor variables. All variables that may have an impact on IMR were included in the analysis, irrespective of results obtained from Pearson and Spearman correlations. The predictor variables used were stunting, underweight-for-age, PPP, HIV prevalence, energy, protein, fat, carbohydrates, energy from protein, energy from fat and energy from carbohydrates.

A scoring system was developed to help identify the stage of nutrition transition in each country. Indicators included in the scoring system were based on trends associated with the advancing nutrition transition. The advanced stage of the transition is associated with diets high in energy and fat, growing levels of overweight/obesity, decreasing levels of infant mortality and stunting, high levels of NCD mortality [7], and possibly a smaller percentage of the population living on less than $1 per day.

A score of one was allocated to each country whose score for the following indicators were in the top quartile of the range: energy, percentage of energy from fat and overweight/obesity. Countries whose score for the following indicators were in the bottom quartile of the range were also allocated a score of one: PPP, IMR and stunting. All indicators that did not receive a score of one automatically received a score of zero. The highest possible score was six and the lowest was zero. A score of six is representative of a country in the last phase of the nutrition transition while zero indicates a country in very early stages of transition. A score close to zero would encapsulate the famine stage and would typically be a country with a low per capita energy intake, high IMR, high prevalence of stunting and low prevalence of obesity. A score close to six, on the other hand, would reflect a high energy intake, low IMR and stunting and a high prevalence of obesity.

Results

From a total of 48 countries in SSA, sufficient recent data were available for 40 countries. Those excluded were: Botswana, Djibouti, Equatorial Guinea, Mauritania, Mauritius, Seychelles, Somalia and Sudan. Table 1 defines the key indicators used. Tables 2 and 3 show the key indicators for 40 countries in SSA. A number of countries still have IMRs above 100 with the highest being Angola (130), Democratic Republic of Congo (DRC) (126), Chad (124) and Sierra Leone (123). Some countries still show a prevalence of stunting in more than 50% of children (Angola, Burundi, Ethiopia, Madagascar, Malawi, Niger and Rwanda). Another important nutrition indicator-exclusive breastfeeding was lower than 10% in some countries (Burkina Faso, Chad, Cote d'Ivoire, South Africa (RSA) and Gabon). In Angola, Niger and Sierra Leone the NCD MR was above 1000 deaths per 100 000. Countries in which more than three quarters of the population live on less than 1 dollar per day include Burundi, Liberia, Rwanda and Tanzania.

Table 2 Key Indicators from 40 countries in Sub-Saharan Africa
Full size table
Table 3 Key nutrition Indicators and income status (poverty) from 40 countries in Sub-Saharan Africa
Full size table

In terms of diet composition, results show that the average DES was 2279 ± 334 kcal/capita/day. Three countries had a DES less than 1800 (Burundi, DRC and Eritrea) and another 5 less than 2000 (Angola, Central African Republic (CAR), Comoros, Ethiopia and Zambia). Figures 1a, b and 1c show that the diet in SSA consists primarily of carbohydrates (> 55% of the overall DES) with protein supplying less than 15% of the overall DES. The average available protein intake was 56.0 ± 12.6 g/capita/day, supplying an average of 9.8 ± 1.6% of the overall DES. Countries with the lowest protein intakes (less than 45 g/capita/day) were Angola, Guinea-Bissau, Comoros, DRC, Liberia, and Mozambique. The average available fat intake was 48.6 ± 16 g/capita/day, which supplied an average of 18.9 ± 5% of the overall DES. Five countries had an extremely low fat intake of less than 30 g/capita/day: Burundi, DRC, Eritrea, Ethiopia, and Rwanda.

Figure 1
figure1

Protein, fat and carbohydrate intake as a percentage of DES in SSA. (A) protein as a percentage of DES, (B) fat as a percentage of DES, and (C) carbohydrates as a percentage of DES.

Full size image

The results of correlations between independent variable IMR and several predictor variables are shown in Table 4. Correlations between IMR and predictor variables that were statistically significant include stunting (p = 0.01), underweight-for-age (p = 0.02), PPP (p = 0.02), energy (p = 0.04), protein (p = 0.01) and the percentage of energy from protein (0.04).

Table 4 Correlations between independent variables (infant mortality rate and non-communicable disease mortality rate) and several predictor variables
Full size table

Multiple logistic regression analysis was used to explore the determinants of IMR. All variables used in the univariate analysis (Table 3) were included, irrespective of whether they were significantly associated with the IMR. Table 5 shows that underweight-for-age (p = 0.02), protein (p = 0.001) and the percentage of exclusively breastfed infants (p = 0.003) are associated with the IMR. As the percentage of children that are underweight-for-age increases, the IMR increases. Conversely, an increase in the protein supply and number of exclusively breastfed infants results in a decrease in the IMR. Stunting, HIV prevalence, PPP, total energy, and energy from protein were no longer significant, whereas exclusive breastfeeding became significant. The determinants of NCD MR were explored and excluded since the NCD MR are estimates based on assumptions and extrapolations due to the lack of reliable mortality and morbidity data from SSA [18].

Table 5 Results of multiple linear regression analysis using the outcome variable infant mortality rate
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Figure 2 shows the relationship between stunted children and overweight/obese women. Findings show that, to differing degrees, all countries have stunted children and overweight/obese woman. The percentages of stunted children coupled with overweight/obese women were especially high in Lesotho, Swaziland, Cameroon and Sao Tome and Principe.

Figure 2
figure2

Relationship between Stunted children and overweight/obese women.

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A scoring system was developed to assess each country's stage in the nutrition transition (Table 6). Countries with the highest scores include RSA which scored a six, Ghana, Gabon and Cape Verde which scored five, and Senegal which scored four. These countries had relatively low IMR (24-57 deaths per 1000 live births), relatively high levels of obesity/overweight (> 29%), and low levels of underweight (6-9%) in women, as well as high intakes of energy (DES > 2500 kcal/capita/day) and fat (> 50 g/capita/day) and average NCD MR (591-867 deaths per 100 000). Countries having a zero score include Angola, Burundi, Chad, Comoros, Congo Brazzaville, DRC, Ethiopia, Madagascar, Malawi, Mozambique, Niger, Rwanda, Tanzania, Uganda and Zambia. They are characterized by many in the population living on less than 1 dollar per day (39-81%), a low DES (1600-2500cal/capita/day), low energy intake from fat (7-21%), a low prevalence of obesity (4-22%), and a high prevalence of stunting (31-63%). Although they do not all lie in the highest quartile for IMR it still remains high being between 65 and 124 in these countries.

Table 6 40 Sub-Saharan countries listed in descending order of Nutritional Transition Scores and the indicators that contribute to them
Full size table

Discussion

It has long been accepted that the health status of a population is dependent on many inter-connected factors. Environmental, socio-economic and political influences are all associated with attaining health. This study has looked at the impact of nutrition (DES, protein, carbohydrate and fat intakes) on IMR and undernutrition in children and in overnutrition in adults

One of the most important findings of this SSA study is the significant relationship between IMR with exclusive breastfeeding and available protein intake shown in the multiple regression analysis. Stunting, DES and PPP were not significant predictors of IMR, despite them being significant in the univariate analysis. It appears that the strong relationship between IMR and these variables were by chance, and once confounding was controlled for, the significant associations disappeared.

Indeed, the regression analysis in the current study showed exclusive breastfeeding to be significantly associated with IMR, even though it was insignificant in the univariate analysis. It is disheartening to know that only a small prevalence (33.6 ± 20%) of mothers in SSA countries chose to breastfeed exclusively, despite the abundance of strategies directed at promoting exclusive breastfeeding in the continent. This prevalence is corroborated by those of WHO [19] that reported a finding of 30% in SSA. Breast milk is always the best, especially in a continent that grapples with high levels of food insecurity, poverty and HIV/AIDS infections. Breast milk provides just the right blend of proteins, fats, carbohydrates, minerals, and calories. Furthermore, it contains antibodies, which help protect the baby from infections and diseases [20–22]. As such, the results of the current study have important implications for policy-makers in Africa, as it emphasizes the importance of exclusive breastfeeding in the prevention of infant mortality.

The current study also highlights the fact that many countries in SSA have at least a reasonable available intake of protein (> 10% of total DES) and fat (> 20% of total DES) [20]. The amount of protein consumed seems to be an important predictor for IMR in the current analysis. Indeed, results outlined in Figure 1a suggest that those individuals residing in DRC, Liberia and Guinea-Bissau consume the lowest amount of energy from protein, while at the same time having the highest levels of infant mortality (Table 2). Moreover, according to Earl and Borra [20], populations consuming 24-44 g of protein may not be getting enough essential amino acids. Amino acids are indeed crucial in the growth of infants; issues that have been stressed in child health for decades. Clearly, health workers in SSA need to prioritise strategies directed at emphasizing the importance of protein in the infants' diets as well as the promotion of exclusive breastfeeding for at least 6 months if the IMR is to be reduced.

The mean intake of 18.9 ± 5% of the overall DES from fat in the current study poses concern. Thirteen to 24 g of fat is equivalent to at least 2.5 to 5 teaspoons of fat. These levels are very low when compared to the recommended daily allowance of at least 65 g for adults and children over 4 years [20, 21]. As such, those individuals (especially children) consuming small amounts of fat may not be getting enough essential fatty acids to sustain their daily needs. It is therefore not surprising that countries at the lower extremes of total fat intake (Burundi with 13.4 g and DRC with 24.3 g) also presented with high IMR of 102 and 126, respectively.

The fourth Millennium Development Goal (MDG) is to reduce child mortality. One of the indicators used to measure progress is the IMR [23], which is a commonly used indicator of a population's economic and social development [24]. Despite developing countries experiencing a decline in infant mortality during the last century, the results of the current study clearly show that the prevalence of undernutrition and infant mortality in SSA is still unacceptably high. These results are corroborated by other studies [25–27]. Moreover, according to Chopra and Darnton-Hill [28], the proportion and number of undernourished children in SSA has increased during the last 10 years.

Findings from this study indicate that the IMR in SSA ranges from as low as 24 to as high as 130 deaths per 1000 live births, while the percentage of stunted children range from 20% to 63%. Countries with the highest nutrition transition scores were found to have relatively low levels of IMR, stunted children and underweight-for-age. Despite some countries having lower levels than others, the percentage of children that are stunted and underweight-for-age in SSA as a whole, is still disappointingly high. From these results we conclude that countries experiencing the nutrition-related NCD phase of the transition, while experiencing high levels of obesity, are also experiencing a decline in rates for infant mortality and children that are stunted and underweight-for-age.

To speed up the reduction of infant and child mortality in SSA, countries need to allocate money to improving mother and child health care services and train health workers to detect and treat malnutrition related conditions as early as possible. Furthermore, improving the nutritional status of pregnant women will improve fetal growth which may lead to better health implications for many children [2].

Findings of the current study also show that RSA, Ghana, Gabon and Cape Verde had the highest nutrition transition scores. These countries with their relatively low levels of IMR and underweight, and relatively high levels of obesity/overweight, energy and fat intakes display classic signs of a population well established in the nutrition-related NCD phase of the nutrition transition.

However, countries with a high prevalence of obesity/overweight among women (Swaziland, Cameroon, Lesotho, and Sao Tome and Principe) were also found to have a moderate prevalence of children that are stunted (29-45%), a low prevalence of children that are underweight-for-age (6-17%), and nutrition transition scores of two and three. These findings confirm the prevalence of the dual burden household [9]. While the dual burden household appears to be prevalent throughout SSA, its prevalence is especially high in countries undergoing the receding famine stage of the nutrition transition. This is further supported by their average energy and fat intakes.

Findings show that more than half of the countries (n = 26) evaluated in this analysis had nutrition transition scores of zero and one. Most of them had a high prevalence of children that are stunted or underweight-for-age, small percentages of women that are overweight and obese, and low intakes of energy, protein, and fat. In addition, their IMR are moderate to high, and in most of these countries more than 50% of the population live on less than one dollar per day. These countries are still in the receding famine stage of the nutrition transition. This implies that within the next few years they can be expected to move into stages 3-5 with their typical pattern.

Since stunting and undernutrition during childhood is associated with obesity during adulthood [29], the co-morbidities related to obesity are bound to increase in countries still in the early stages of the transition. This will result in their moderate NCD mortality levels rising dramatically. As such, endorsing strategies directed at reducing food insecurity in these countries will directly reduce the prevalence of stunting and at the same time indirectly reduce the prevalence of chronic non-communicable diseases.

The scoring system developed and used in the analysis of this paper has attempted to identify each country's stage in the nutrition transition. This system has the potential to be applied to other developing countries, thereby identifying their stage in the transition and being able to predict areas of concern that are most in need of assistance.

Conclusion

Findings from this study show that countries in SSA are undergoing a nutrition transition. More than half of them are still in the early stages, while a few have reached a point where changes in dietary patterns are affecting health outcomes in a large portion of the population. Countries in the early stage of the transition are especially important, since the speed of transition is occurring more rapidly in lower- and middle-income countries. These countries are at risk of developing a high prevalence of obesity and NCD mortality more rapidly than has occurred in the West.

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    • Zulfa Abrahams
    • , Zandile Mchiza
    •  & Nelia P Steyn
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ZA: data collation, analysis and wrote the manuscript, and approved the final manuscript. NS: conceptualised paper, reviewed manuscript. Read and approved the final manuscript. ZM: involved in writing and reviewing manuscript. Read and approved final manuscript.

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Abrahams, Z., Mchiza, Z. & Steyn, N.P. Diet and mortality rates in Sub-Saharan Africa: Stages in the nutrition transition. BMC Public Health 11, 801 (2011). https://doi.org/10.1186/1471-2458-11-801

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Keywords

  • Infant Mortality Rate
  • Food Insecurity
  • Exclusive Breastfeed
  • Physical Activity Pattern
  • Nutrition Transition

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