|Year : 2014 | Volume
| Issue : 6 | Page : 743-749
Obesity, overweight, and underweight among urban Nigerians
CI Okafor1, ID Gezawa2, AA Sabir3, TH Raimi4, O Enang5
1 Department of Medicine, University of Nigeria/University of Nigeria Teaching Hospital, Ituku Ozalla, Enugu State, Nigeria
2 Department of Medicine, Bayero University/Aminu Kano Teaching Hospital, Kano, Nigeria
3 Department of Medicine, Usmanu Danfodiyo University Teaching Hospital, Sokoto, Nigeria
4 Department of Medicine, Ekiti State University/Ekiti State University Teaching Hospital, Ado-Ekiti, Ekiti State, Nigeria
5 Department of Medicine, University of Calabar, Teaching Hospital, Calabar, Cross River State, Nigeria
|Date of Submission||22-May-2014|
|Date of Web Publication||11-Nov-2014|
C I Okafor
Department of Medicine, University of Nigeria/University of Nigeria Teaching Hospital, Ituku Ozalla, Enugu State
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: Disease burden from communicable and noncommunicable diseases is a significant health challenge facing many developing nations. Among the noncommunicable diseases, is obesity, which has become a global epidemic associated with urbanization.
Objective: The aim was to evaluate the prevalence of weight abnormalities, their pattern of distribution and regional differences among apparently healthy urban dwelling Nigerians.
Methods: A cross-sectional community-based descriptive survey was carried out in five urban cities, each from one geo-political zone of Nigeria. Multistage sampling procedures were used to select participants using the World Health Organization STEPS instrument. Ethical approval and consents were duly and respectively obtained from the Ethics Committee in the tertiary centers and participants in each of these cities. Analysis was performed using SPSS version 20 (IBM Corp., Amonk, NY; released 2011) with P value set at < 0.05.
Results: A total of 5392 participants were recruited; of which, 54.5% and 45.5% were males and females respectively. Mean (standard deviation) age and body mass index (BMI) were 40.6 (14.3) years and 25.3 (5.1) kg/m 2 . Obesity, overweight, and underweight were found in 17%, 31%, and 5% of participants respectively. Significantly, while underweight declined with increasing age, overweight, and obesity increased to peak in the middle age brackets. Age of ≥ 40 years was found to confer about twice the risk of becoming overweight. The prevalence of obesity and mean BMI were significantly higher both among the females and the participants from southern zones.
Conclusion: Obesity and overweight are common in our urban dwellers with accompanying regional differences. Attainment of middle age increases the likelihood of urban dwelling Nigerians to become overweight/obese. There is therefore the need to institute measures that will check development of overweight/obesity early enough, while improving the nutritional status of the few who may still be undernourished.
Keywords: Nigerians, obesity, urban, weight distribution
|How to cite this article:|
Okafor C I, Gezawa I D, Sabir A A, Raimi T H, Enang O. Obesity, overweight, and underweight among urban Nigerians. Niger J Clin Pract 2014;17:743-9
|How to cite this URL:|
Okafor C I, Gezawa I D, Sabir A A, Raimi T H, Enang O. Obesity, overweight, and underweight among urban Nigerians. Niger J Clin Pract [serial online] 2014 [cited 2019 Nov 19];17:743-9. Available from: http://www.njcponline.com/text.asp?2014/17/6/743/144389
| Background|| |
The World Health Organizations (WHO's) technical report series of 1995 indicated that body weight significantly impacts on the health and disease status of an individual.  Specifically, extremes of body weight namely underweight and overweight/obesity are associated with increased risk of disease morbidity and mortality. Diseases related to poor immune function such as tuberculosis are more common in underweight individuals, whereas cardiometabolic disorders are more common in overweight/obese persons.
These extremes of weight also tend to indicate the nutritional status of individuals and indirectly, the socioeconomic status. , Urban and rural residence are usually associated with higher and many a times, poorer socioeconomic status, respectively and thus the greater prevalence of overweight/obesity may be seen in urban dwellers.  This informed the rural-urban drift which many nations including Nigeria has been witnessing for many years now. Globally, the trend towards overweight/obesity in urban cities is now assuming an epidemic proportion and this is attributed to reduced physical activity and consumption of energy and fat-laden diets obtained from many fast food centers.
Bakari et al. in 2007 reported these abnormalities of body weight to be common in two suburban communities in Northern Nigeria at the rates of 13.1% for obesity, 18.5% for overweight and 6.7% for underweight. Data on obesity have been commonly reported in the past among specific risk groups such as hypertensive and diabetic populations many of which are hospital based studies. , Other community based studies which are now emerging have been reported among rural or semi urban dwellers. , This study did not only focus on urban communities, but also on apparently healthy individuals (defined here as individuals who are not known to have hypertension or diabetes) living in these communities. This is in recognition of the fact that these individuals can be regarded as people who are unaware of their cardiovascular risk status. To the best of our knowledge, therefore, this is the first community based survey on the prevalence of overweight and obesity among a representative sample of urban adults selected from different geopolitical zones of Nigeria using the WHO Step-wise methodology. This study also provides opportunity for us to compare trends across different geo-political regions of the country studied.
The aim of this study was therefore to determine the overall burden and pattern of abnormal weight distribution among apparently healthy urban dwelling Nigerians and to evaluate if there were any regional differences.
| Methods|| |
Five urban cities, which belonged to different geo-political zones of Nigeria, were involved in the study. These cities namely Enugu (South East), Maiduguri (North East), Sokoto (North West), Sagamu (South West) and Calabar (South South) represented the place of medical practice of each investigator involved in this study. The study was duly approved by the Health Research and Ethics Committee of the tertiary hospitals located in these cities. Recruitment of participants was done through a multistage sampling. The first stage involved selection of some sections/wards in these cities using a simple random sampling technique. The second stage involved selection of households within these wards using cluster sampling technique and having obtained clearance from the ward heads. Adults within the households were invited to a convenient location within the wards for recruitment and some health enlightenment campaigns. Individuals who gave their consent were subsequently recruited consecutively to participate in the study. Participants were defined as apparently healthy if they neither had a history of hypertension, diabetes or both nor took medication(s) for hypertension and diabetes mellitus, which are known to be commonly associated with obesity.
Data collection and anthropometric measurements were done with the assistance of medically trained assistants drawn from each of the tertiary institutions using the standardized methods as stipulated in the WHO steps instrument for surveillance of behavioral risk factors (version 2.0).  Weight categorization was done as defined by body mass index (BMI); an index determined using weight and square of the height according WHO. , Accordingly, BMI of < 18.5 kg/m 2 , 25-29.9 kg/m 2 and > 30 kg/m 2 were used to define underweight, overweight and obesity respectively. Obesity was further classified into mild (BMI of 30-34.5 kg/m 2 ), moderate (35-39.9 kg/m 2 ) and severe (>40 kg/m 2 ). Gender-specific waist circumference (WC) classification was defined using both the National Cholesterol Education Program (NCEP) and International Diabetes Federation (IDF) proposal for sub-Saharan Africa, which corresponds to that proposed for Europids. , WC ≥ 102 cm and ≥ 94 cm for males and ≥ 88 cm and ≥ 80 cm classified central obesity among the participants using NCEP and IDF criteria respectively. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were separately defined using SBPs and DBPs of ≥ 140 mmHg and ≥ 90 mmHg, respectively according to JNC 7 classification.  Hypertension hence was deemed to be present if SBP and DBP or any of either SBP or DBP were elevated and met the classification criteria of JNC 7. Forty years of age was used to define the lower boundary of middle age. 
Statistical analysis was performed using SPSS version 20 (IBM Corp., Amonk, NY; released 2011) with level of significance set at P < 0.05. Student's t-test and analysis of variance (ANOVA) were used for comparison of means between two groups and multiple groups respectively while Chi-square analysis was used for test of association. Correlation between continuous variables was determined using Pearson's correlation.
| Results|| |
General description of the participants
A total of 5392 participants consisting of 2937 (54.5%) males and 2455 (45.5%) females were recruited for the study The general characteristics as shown in [Table 1] revealed that the greater proportion of the participants below 44 years were males. From 45 years and above, the trend changed with females being in majority. Abnormalities of weight (underweight, overweight and obesity) affected more females than males. Similarly, more females had systolic hypertension as against the pattern with diastolic hypertension; however, the presence of hypertension generally leveled off between males and females. Prevalence of hypertension was high among the group (40.6% (2190/5392)). Central obesity using the gender-specific WC classifications proposed by IDF and NCEP was more common in the females. The IDF classification identified more participants as centrally obese. All the gender associations were significant except for that of hypertension [Table 1].
|Table 1: Frequency distribution of the clinical characteristics of the group by gender |
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The mean (standard deviation) of the age and BMI for the group were 40.6 (14.3) years and 25.3 (5.1) kg/m 2 [Table 2] depicting that on the average the group belonged to the middle age bracket and were generally overweight respectively. Significant mean gender differences were observed except for systolic hypertension [Table 2]. The female participants had higher mean WC and BMI though male participants weighed more than the females.
Weight distribution and its pattern among the participants
The weight distribution among the participants is shown in [Figure 1]. Obesity was found in 933 participants giving a prevalence of 17.2%, while 1679 (31.1%) participants were overweight. A small proportion (4.9%) was underweight, while the rest (47%) of the participants had normal BMI. Among the obese participants, mild or stage 1 obesity was the most common [Table 1]. Prevalence of central obesity was higher than generalized obesity using NCEP (28.4%) and IDF criteria (46.1%). Correlation was positive, but stronger between WC and BMI (r = 0.71; P < 0.001) than with waist-to-hip ratio (r = 0.57; P < 0.001).
Age and pattern of weight distribution
Prevalence of obesity was found to increase with increasing age until after 45-54 years age group. Underweight, which involved 37% of the participants, was most frequent in 15-24 years age group steadily declining as the ages increased, whereas overweight and obesity increased with age with peaks in 35-44 years and 45-54 years age groups, respectively [Figure 2]. Overweight and obesity was less common in the lower and upper extremes of age.
|Figure 2 : Pattern trend of the burden of underweight, overweight, and obesity among the participants by age groups (data table shows the percentages)|
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Among the 933 obese participants, the highest prevalence of generalized obesity was seen in those within 45-54 years age group, which affected 277 (29.7%) participants. Using ANOVA to evaluate mean BMI and WC among the 5392 participants, it was observed that, the mean BMI and WC significantly increased with age; the highest ([BMI: 26.9 [5.4] kg/m 2 and WC: 91.4 [12.2] cm]) occurring in the middle age bracket of 45-54 years (F (5, 5386) =94 and 190.5; [P < 0.0001, respectively]). This trend in the pattern of mean BMI and significant observation was similar for both males and females. The trend described above is clearly shown in the means plot [Figure 3]. The risk of developing generalized obesity was about twice when middle-age (≥40 years) is attained or if there is hypertension [Table 3].
|Figure 3: Means plots of body mass index (BMI) in male (F [5, 2391] = 61.2, P < 0.0001) and female (F [5, 2449] = 35.0, P < 0.0001) participants showing the peak BMI at 45-54 years age brackets|
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|Table 3: Risk of obesity with attainment of middle-age and hypertension |
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Gender and pattern of weight of weight distribution
The female gender was generally associated with greater proportion of individuals in the underweight, overweight, and obese categories (χ2 =129.5; P < 0.0001), while the males were in greater proportion among those with normal BMI [Table 1]. Generalized obesity occurred in 22% of females as against 13.4% in males (χ2 =68.2; P < 0.0001).
Regional patterns and differences
The five zones were categorized into two regions namely Northern and Southern regions. 2432 (45.1%) participants belonged to the Northern region while 2960 (54.9%) belonged to the Southern region. Significant regional differences were noted in the prevalence of obesity (tested using Chi-square) and mean difference in the indices or clinical characteristics (using t-test). The burden and mean values were higher among participants from the Southern region [Table 4] and [Table 5].
|Table 5: Mean differences in clinical characteristics of the participants distributed by zones |
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| Discussion|| |
Globally, the prevalence of obesity has been reported to range from as low as 0.6% among males in Gambia to as high as 80.2% in Nauru, while among females, obesity ranged from 0.2% in Ethiopia to 78.6% in Nauru.  The prevalence of obesity found in our study (17.2%) is higher than the 9.8% and 4.2% reported by Desalu et al.  and Puepet et al.  from Ilorin and Jos respectively, but lower than the 19.2% reported from Dar es Salaam in Tanzania.  The overall prevalence of obesity in our study is also lower than that reported from developed and high income countries such as Australia  and the USA.  The high rate of consumption of energy dense high calorie diet coupled with low levels of physical activity in these countries could be responsible for the higher prevalence of obesity. These habits in some cultures are associated with high socioeconomic status where they may reflect affluence or high standards of living. It was clearly demonstrated in urban Cameroon that socioeconomic status was positively associated with adiposity.  In general, adoption of western lifestyles by developing nations, which is one of the negative impacts of urbanization could therefore contribute to the higher prevalence values as similarly observed in this study when compared to the studies by Desalu et al. and Puepet et al. which were done some years back. The observation that almost half of our studied population (48.3%) is either overweight/obese is in support of the rising epidemic of both overweight and obesity in our developing Nigeria. Rural-urban migration and the adoption of western lifestyle have become recognized as the two most popular theories for the rising trend in the prevalence of overweight and obesity in developing countries.  Both urbanization and westernization are associated with decreased physical activity and increased food supply, including access to high calorie energy dense food and sugar sweetened beverages.
In this study, we found the prevalence of both overweight and obesity to be higher among women compared with men. Similar findings have been reported from previous studies. , It is known that women usually do enjoy some cardiovascular protection before menopause as a result of the activities of estrogens. This protection is lost during and after menopause and one of the outcomes of this physiologic change is weight gain and decrease in basal metabolism.  Apart from genetic and hormonal differences, low levels of physical activity in women is also thought to contribute to the observed gender differences.  Amole et al. demonstrated a significantly higher prevalence of physical inactivity among Nigerian females than males at Ogbomosho, Nigeria. In addition, it is well-documented that in some cultures there is the social desire for fat women, hence practices that encourage female obesity are also observed in such cultures.  A good example is the premarital "fattening rooms" prevalent in the South-South geopolitical zone of Nigeria among the Annang people.  Besides the cultural practices, which tend toward female seclusion which is practiced widely in the north as acknowledged by Bakari et al. and in some places in the south,  Wahab et al. reported female sex as a significant predictor of high prevalence of obesity in northern Nigeria.
The prevalence of overweight and obesity in the index study was found to increase with age in both men and women. Participants within the middle age bracket had the highest prevalence of obesity. Other studies have reported similar observations. ,, The increased rate of obesity with age has been attributed to decreased physical activity and metabolism that accompanies aging. ,, We however noted a decline in obesity rates after the age of 55 years with the lowest prevalence in the 65-74 years age group. Puoane et al.  in a study of obesity in 13,089 South African men and women also reported similar findings. The reason for this observation is not quite clear, but it is possible that debility especially at the upper extreme of age could largely affect the turnout of such elderly people and hence the proportion of such participants available for recruitment. Underweight was detected in 5% of our studied participants and its prevalence was highest in the 15-24 years age group. This implies that these participants are not only undernourished but may actually be stunted. Stunting can occur if an individual is affected by chronic infection like tuberculosis, which develops on a background of nutritionally-induced immunosuppression. Stunting in adolescence has been linked with future development of overweight and obesity in adulthood. 
Significant regional differences in both prevalence and mean indices of obesity existed between the northern and southern regions with higher indices seen in southern regions. Several reasons such as the slender and taller stature of northerners, occupational differences such as the nomadic lifestyle of the northerners, which in turn impacts on level of physical activity, cultural attitudes to affluence and desire for weight gain, especially among the females for marital purposes  could all contribute to these observed differences.
| Conclusion|| |
The prevalence of obesity in Nigeria is high especially among urban dwelling, middle aged women consistent with the observations in other developing countries. Regional differences in prevalence with higher values among the participants from southern zones were observed too. With the demographic and nutritional transition going on in major cities across Nigeria, unless concerted efforts are made to enlighten the populace on the role of lifestyle changes in combating obesity and its associated health risks, we may begin to experience progressive increase in the burden of obesity in the years to come. Adolescents and young adults in our society also deserve attention since undernutrition in this age group is associated with increased morbidity and may add to the burden of obesity in later years. Our findings will go a long way in assisting health policy makers and other stakeholders in coming up with strategies aimed at reducing the burden of obesity in the country. Further studies are needed to determine the predictors of underweight, overweight, and obesity among Nigerians living in urban areas.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]
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