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Food intake and cardiometabolic risk factors in rural Uganda

Abstract

Background

Along with a nutritional transition in Sub-Saharan Africa, the prevalence of non-communicable diseases is increasing rapidly. We assess the association between food intake and cardiometabolic risk factors in a rural population in Uganda.

Methods

The present study was based on data from a household-based case-control study of diabetic and non-diabetic households in Southwestern Uganda, 2012–2013. We analysed food intake in 359 individuals age ≥ 13 years from 87 households, using a household food frequency questionnaire, and measures of glycated haemoglobin (HbA1c), height and weight. We used multinomial logistic regression to model abnormal HbA1c (≥5.7%) and weight status (underweight, normal weight and overweight) as an outcome of total food intake and by nine food groups. Results were reported as odds ratios (OR) with 95% confidence intervals (CI). Models were adjusted for three nested sets of covariates.

Results

The diet primarily consisted of staple food (cassava and plantain). High-Glycaemic Index staple food was the most consumed food group (median = 14 servings/week, p25-p75: 11–17). Milk, meat, fish and vegetables were the least consumed food groups (medians: 0–3 servings/week). Median intake of sugary food was 6 servings/week (p25-p75: 2–9). The OR of having abnormal HbA1c or being overweight increased with every weekly serving of food (1.02, 95% CI: 1.00–1.04 and 1.01 95% CI: 1.00–1.03, respectively). Of specific food groups, each weekly serving of meat increased the OR of being overweight with 33% (95% CI: 1.08–1.64), and fruit intake decreased the OR of abnormal HbA1c (0.94, 95% CI: 0.88–1.00), though this latter association was attenuated after adjustment for weight status, aerobic capacity, and socioeconomic status.

Conclusion

Diet was monotonous, mainly consisting of cassava and plantain, and increasing food intake was associated with abnormal HbA1c and overweight. To prevent non-communicable diseases a diet with higher intake of fish and vegetables, and less sugary food is recommended.

Peer Review reports

Background

Low- and middle income countries (LMIC) are experiencing a nutritional transition characterized by traditional diets being replaced by energy-dense and processed food and beverages [1]. In Sub-Sahara Africa (SSA), these dietary changes are occurring along with an epidemiological transition characterized by a change in the burden of diseases from primarily infectious diseases like tuberculosis and malaria to non-communicable diseases (NCDs) such as cardiometabolic conditions like type 2 diabetes (T2D) and obesity [2, 3].

Historically, the diet in SSA consisted of fruits, green leafy vegetables, legumes and whole grain [4]; food items associated with a lower risk of developing cardiometabolic conditions [5], and included in the healthy diet recommendations from the World Health Organization (WHO) [6]. In contrast, the nutritional transition is exposing LMIC populations to food items such as red/processed meat, refined grains, fat and sugary drinks, which have been associated with increased risk of cardiometabolic conditions [5]. Despite a rapidly increasing burden of cardiometabolic conditions in SSA only few studies have investigated the association between diet and cardiometabolic conditions in this region. A Kenyan cross-sectional study identified several dietary risk factors for NCDs in the population; 13.7% always added sugar to beverages and 94% ate less than 5 servings of fruits/vegetables a day [7].

In Uganda, the diet typically includes plantain, maize, cassava, millet, yams, peanuts, pumpkin, beans, green vegetables, and different fruits, supplemented by smaller amounts of meat and fish [8]. However, rice, wheat bread, sweet potatoes, meat and soda have become a greater part of the diet [8]. In Uganda, in 2014 the prevalence of diabetes was 1.4% [9]. However, the International Diabetes Federation predicts that the number of people living with diabetes in Sub-Saharan African (SSA) will increase with 156% between 2017 and 2045 [10]. In Uganda, data from the Demographic and Health Survey found that from 1995 to 2016 the number of overweight women increased from 9.8 to 16.2% and the number of obese women from 2.0 to 6.2% [11]. Further, a study from eastern Uganda found that in 2013 17.8% of the population was overweight and 7% were obese, though overweight was higher among women than men and higher among people living in urban than rural areas [12].

The effect of food intake on cardiometabolic risk factors has been heavily investigated in high income countries (HIC). However, the increasing prevalence of cardiometabolic conditions in SSA [5, 10] where food items and health systems differ from HIC, highlights a need for research in SSA populations.

The aim of the present study was to investigate food intake and its association with cardiometabolic risk factors in a rural Ugandan population potentially being in the midst of a nutritional transition.

Methods

Study population

We conducted cross-sectional observational analyses using data from a case-control household study in Kasese District, Southwestern Uganda in 2012–2013, with cases being households including a member diagnosed with T2D and controls being households without any members with diagnosed T2D [13]. From hospital files, we identified people with T2D and invited them and all people age ≥ 13 years in their household to participate in the study. Control households were selected using a random sampling plan (Additional file 1). Initially 100 households were invited to the study and 90 of these households (45 cases and 45 controls) participated. Response rate of individuals living in the 90 households was 97.5%. The case-control study included a total of 437 participants aged ≥13 years. Households were excluded if one or more household member reported that they had HIV/AIDS, other forms of diabetes (e.g. type 1 diabetes), active tuberculosis, severe mental illness, alcoholism, or drug addiction. Details are described elsewhere [13]. In the present study, we also excluded participants diagnosed with T2D (n = 45), self-reported malaria (n = 4), sickle cell disease (n = 1) and those being pregnant (n = 12) as these conditions (or treatment) may influence the association between food intake and glycated haemoglobin (HbA1c) and weight status. Furthermore, we excluded 12 participants due to missing information about food consumption and 4 participants due to missing information about aerobic capacity. This resulted in an analytical sample of 359 participants.

Variables

HbA1c (%), height (cm) and weight (kg) and estimated aerobic capacity (VO2-max) [14] was measured for each participant. We used structured questionnaire information about age, sex, household food consumption, household socioeconomic status (SES), years of education, alcohol intake and smoking. Measures and questionnaire data were collected by trained personnel in the local language, Lukonjo. Details are described elsewhere [13].

We categorised food intake according to the Food and Agriculture Organization of the United Nations’ (FAO) food groups [15], but in contrast to FAO, we did not distinguish between different types of vegetables and fruits. Furthermore, the food groups; eggs, organ meat, oils and fat were not included in the food frequency questionnaire (FFQ) used in the present study. We divided FAO’s staple food group into two groups according to Foster-Powell et al.’s International Table of Glycaemic Index (GI) using a cut-off of 70 for low- vs. high-GI [16]. This resulted in nine food groups; high-GI staple food, low-GI staple food, legumes, meat, milk, fish, sugary food, fruits and vegetables (Additional file 2). Consumption of each food group was calculated as the sum of total servings per week.

We used HbA1c as a proxy for diabetes risk. The American Diabetes Association recommends cut-off level for diagnosing diabetes at HbA1c ≥ 6.5%, while HbA1c ≥ 5.7 is considered prediabetes [17]. In the present study population, HbA1c ≥ 5.7 was used as the cut-off level abnormal HbA1c.

Body mass index (BMI), calculated as weight(kg)/height(m)2 was used to define weight status for adults while we used WHO’s sex and age specific BMI z-score (BMIZ) for participants aged ≤19 years [18]. Weight status was categorised as; underweight (BMI < 18.5 or BMIZ<-1 SD), normal weight (18.5 ≤ BMI < 25 or − 1 < BMIZ<+ 1 SD) and overweight (BMI ≥ 25 or BMIZ> + 1 SD) [18, 19]. Due to a low number of obese participants (n = 8), overweight and obese were merged into one group.

We included aerobic capacity and household SES as co-variates. Aerobic capacity was categorised into three groups (low, medium and high) according to Astrand [20]. Household SES was determined using principal component analysis [21] to score SES at household level and create a categorical variable with three groups – low, medium and high (tertiles). Individuals living in the same household were assigned to the same SES group.

Statistical analysis

Characteristics of the study participants were reported as proportions or means with 95% confidence intervals (CI) for the total study population and by sex. Food intake was visualized for the total study population as boxplots including median, p25, p75, minimum and maximum values for the nine food groups. To model HbA1c or weight status as a function of total food intake and separate food groups, we used multinomial logistic regression with household as a random effect to account for household clustering. All models were adjusted for sex and age (Model I). As a next step, we adjusted for total food intake (Model II) and lastly we ran a model (Model III) also adjusting for aerobic capacity. In the analysis of HbA1c, weight status was included as a co-variate in Model III. The results were presented as odds ratios (OR) with 95% CI. The analyses were conducted using STATA (14.2, Texas, USA).

Results

Characteristics of study participants

Overall, the study population included 57.9% women, mean age was 35.5 years (95% CI: 33.4–37.6) and 41.5% of the participants shared household with a person with T2D (Table 1). The mean HbA1c level was 5.4 (95% CI: 5.4–5.5) and 25.9% of the participants had abnormal HbA1c. Of the participants, 44 (12.3%), 52 (14.5%) and 263 (73.3%) were underweight, overweight and normal weight, respectively. Majority of the participants had a medium aerobic capacity (43.2%).

Table 1 Characteristics of study population (≥13 years of age) in Kasese District, Uganda (N = 359), Food Intake and Cardiometabolic Risk Factors in Rural Uganda study, 2012–2013

Weekly food intake

Median total food intake was 53 servings/week (p25-p75: 44–69). High-GI staple food was the food group with the highest median of weekly servings (14 servings/week, p25-p75: 11–17) (Fig. 1), followed by legumes (10 servings/week, p25-p75: 7–11), fruits (9 servings/week, p25-p75: 5–15) and low-GI staple food (8 servings/week, p25-p75: 7–12). In our study population, 86.1% did not consume milk at all and the highest milk intake was 7 servings/week. Median intake of meat was 1 serving/week (p25-p75: 0–3), while the median intake of fish and for vegetables was 3 servings/week (p25-p75: 1–3 for fish; p25-p75: 1–5 for vegetables). Median intake of sugary food was 6 servings/week (p25-p75: 2–9). The food items with the highest median intake in the study population was cassava (9 servings/week, p25-p75: 7–13) and plantain (7 servings/week, p25-p75: 3–7).

Fig. 1
figure1

Boxplot of number of food servings/week in Kasese District, Uganda (N = 359), Food Intake and Cardiometabolic Risk Factors in Rural Uganda study, 2012–2013. Abbreviations: GI, glycaemic index

Food intake and HbA1c

For total food intake, the OR of having abnormal HbA1c increased 2% (OR = 1.02, 95% CI: 1.01–1.04) with each food serving per week. Adjusting for weight status, aerobic capacity and socioeconomic status did not attenuate the association (Table 2). Intake of high-GI staple food (OR = 1.06, 95% CI: 1.00–1.12), legumes (OR = 1.10, 95% CI: 1.01–1.20), milk (OR = 1.25, 95% CI: 1.07–1.46) and sugary food (OR = 1.08, 95% CI: 1.01–1.15) were also associated with increased OR for having abnormal HbA1c. Adjustment for total food intake attenuated the association for all these food groups. (Model II, Table 2). When adjusting for total food intake (Model II), intake of fruit was associated with decreased OR for having abnormal HbA1c (OR = 0.94, 95% CI: 0.88–1.00). In the fully adjusted model (Model III, Table 2), none of the food groups were associated with decreased or increased ORs of abnormal HbA1c.

Table 2 Odds ratio of having abnormal glycated haemoglobin (≥ 5.7) compared to normal glycated haemoglobin (< 5.7) per increase in number of food servings/week by 1 unit in Kasese District, Uganda (N = 359), Food Intake and Cardiometabolic Risk Factors in Rural Uganda study, 2012–2013

Food intake and BMI

Total food intake was associated with 1% (OR = 1.01, 95% CI: 1.00–1.03) increased OR of being overweight compared to normal weight per one additional serving of food per week (Table 3). Of specific food groups, intake of meat (OR = 1.38, 95% CI: 1.16–1.64) and low-GI staple food (OR = 1.09, 95% CI: 1.02–1.17) increased the OR of being overweight. Adjustment for total food intake attenuated the OR for low-GI staple food (OR = 1.05, 95% CI: 0.96–1.15), but not the association between meat intake and increased OR of overweight. The association between meat intake and overweight was not attenuated by adjustment for aerobic capacity and socioeconomic status (Model III, Table 3) (OR = 1.33, 95% CI: 1.08–1.64). We did not find any association between underweight and total food intake or specific food groups (Table 3).

Table 3 Odds ratio of being underweight or overweight compared to normal weight per increase in number of food servings/week by 1 unit in Kasese District, Uganda (N = 359), Food Intake and Cardiometabolic Risk Factors in Rural Uganda study, 2012–2013

Discussion

We found that food intake in general was monotonously and dominated by staple food, especially cassava and plantain, and legumes and fruits. Our results showed that increasing number of food servings was associated with increased OR of abnormal HbA1c and being overweight. In terms of specific food groups, each weekly serving of meat was associated with a 33% increased OR of being overweight. Each weekly serving of fruit was associated with a 6% decreased OR of abnormal HbA1c, however, after further adjustment for weight status, aerobic capacity and socioeconomic status, the association was attenuated. Our findings of increased OR of abnormal HbA1c and overweight with increasing number of food servings were in accordance with previous studies showing an association between increased total energy intake and increased risk of T2D potentially mediated through overweight [22, 23].

We found that the OR of abnormal HbA1c decreased with increased number of fruit servings, which is in accordance with a meta-analysis by Wang et al. showing that a higher intake of fruit and vegetables was associated with a decreased risk of T2D [24]. We found a tendency that intake of fruit and vegetables was associated with a lower OR of overweight in the present study. Results of previous research have suggested that intake of fruit and vegetables may reduce overweight by replacing food items with high fat content [25]. WHO recommends five portions of fruit and vegetables per day (excluding staple food e.g. cassava) [6]. In the present study, median intake of fruit was 1.3 per day (approx. 17% of total food intake), while median intake of vegetables was 0.4 per day (approx. 6% of total food intake).

Results from previous studies showed an association between intake of red and processed meat and increased risk of T2D and overweight [26,27,28]. In the present study, we found that meat intake was associated with higher OR of overweight. However, we found no association between meat intake and abnormal HbA1c, which may be explained by a general low intake of meat in our study population (median = 1 serving per week), that the food groups in our study did not differentiate between red and white meat, and that meat intake primarily came from free-range domestic animals and not processed meat.

Approximately 11% of total food intake in our study population consisted of sugary food, which is higher than the 10% recommended by WHO [29]. A systematic review of Sonestedt et al., found an association between intake of sugar-sweetened beverages and higher risk of T2D, but no association for other types of sugary food [30]. Thus, our findings were not in accordance with previous research, as we did not find an association between intake of sugary food and HbA1c or weight status, even though the sugary food group in the present study included sugary drinks e.g. soda and juice as sugary food.

We found an association between high-GI staple food and abnormal HbA1c, which is in line with a previous meta-analysis of three large US cohorts showing an association between increased intake of high-GI staple food and risk of T2D [31]. Though, the association attenuated in the present study after adjustment for total food intake.

Intake of cereal fibres has been associated with decreased risk of developing T2D and obesity [32]. In contrast, we found that low-GI staple food was associated with increased OR of overweight in Model I, and the same trend was observed after adjustment for total food intake, which is not in line with previous studies.

In accordance with previously reported food consumption in Uganda [33], our study population had a monotonous diet with the most consumed food items being staple food; cassava and plantain. Further, intake of processed food was low, but intake of sugary foods was higher than the 10% recommended by WHO. This suggests that the nutritional transition in our rural Ugandans study population may only be in the initial phase [1]. The monotonous diet may also explain why we found little variation in intake of specific food groups between people with different HbA1c levels and weight status. However, the monotonous diet in itself may also place the study population in risk of cardiometabolic diseases, as high dietary diversity has been associated with decreased risk of T2D [34]. In addition, the number of people who were overweight or obese was low in our study population (14%). Further, the study population was younger than the average age at diagnosis of T2D in Uganda (age 52 years) [35], and generally healthy as we excluded individuals with diagnosed T2D. Lastly, many of the participants had a high activity level as they were peasants and walked long distances [36].

We did not find any associations between intake of food groups and cardiometabolic risk factors, which were not in accordance with previous studies from HIC, even though the food items that made up the food groups in our study were different from HIC settings, e.g. stable food in our study population consisted mainly of cassava and plantain while bread and potatoes are more common stables in HIC [37, 38]. The monotone diet in our study population may put the people at risk of nutritious deficiencies [39] and may be caused by lack of access to a varied diet. Thus, in this rural district around 48% lived below the poverty line, many of the participants were subsistence farmers and land size has been decreasing as land is inherited patrilineally, and due to an increasing population growth, the size of land holdings is decreasing rapidly [40, 41]. Even though cardiometabolic risk factors generally were low in the study population, the high sugar intake may indicate a nutritional transition.

Limitations

The present study had certain strengths. This was the first study to investigate the association between food intake and cardiometabolic risk factors in a rural East African population. The study population lived in a hard-to-reach area, and the study had several methodological strengths including objective individual measures of HbA1c and BMI, a locally adapted FFQ and adjustment for possible confounders. Households including a member with T2D were selected while controls were randomly chosen with a high response rate of 90% for households and 97.5% for individuals. However, the study also had some limitations: firstly, data on food intake was reported as servings per week and collected at household level. We considered this a valid measure since the vast majority of the household members shared meals and it was rare for the study population to eat outside their home (only 1.4% of the households included family members, who reported to sometimes eat outside their home), though differences in portion sizes and number of servings between household members may have caused imprecise reporting of food intake. Secondly, the FFQ as well as the food groups used in the present study was designed to assess dietary diversity, not cardiometabolic risk factors [13]. Thirdly, the FFQ of the present study was not validated against other methods of assessing food consumption. Therefore, underreporting of certain food items, not incorporated in the FFQ, was possible. Fourth, cooking methods were not assessed in the present study, which could have caused differences in the energy content of the same food item. Missing information on specific food items and cooking method would potentially attenuate the association between food intake and cardiometabolic risk factors.

We used data from a case-control household study. Even though participants with diagnosed T2D were excluded from the present study, participants having a household member diagnosed with T2D may have had higher predisposed genetic risk of abnormal HbA1c and may have changed their diet over time according to dietary recommendations for T2D. However, additional sensitivity analysis did not show any different results, when excluding households with T2D (results not shown). Also, in a previous study in the same study population [13], we found lower HbA1c among residents below the age of 30 years in diabetic households [13].

Data were collected in 2012–2013, however, we are not aware of major political or economic changes or reforms that would have influenced agriculture, crops or eating patterns.

Conclusion

In conclusion, we found a monotonous diet in our study population including protective components for cardiometabolic diseases, such as low consumption of meat and relatively high consumption of legumes and fruits. Despite a low meat intake, a 33% increased OR of overweight was found with each additional weekly serving of meat. Fruit intake was associated with decreased OR of abnormal HbA1c, though the association was attenuated after adjustment for weight status, aerobic capacity and socioeconomic status. Several risk factors for cardiometabolic disease was also observed in the diet, such as a relatively high consumption of sugary food, and low consumption of vegetables. Thus, the rural Ugandan population is most likely gradually transitioning towards a more unhealthy diet. In Uganda, nutrition strategies in general and those to prevent cardiometabolic diseases should focus on how people in rural areas can access and utilize existing resources sustainable e.g. fish from local lakes and grow crops that will provide both quantity, quality and a varied diet.

Availability of data and materials

Not applicable.

Abbreviations

VO2-max:

Aerobic capacity

BMI:

Body mass index

BMIZ:

BMI z-score

CI:

Confidence interval

FAO:

Food and Agriculture Organization of the United Nations

FFQ:

Food frequency questionnaire

GI:

Glycaemic Index

HbA1c:

Glycated haemoglobin

HIC:

High income countries

LMIC:

Low- and middle income countries

NCD:

Non-communicable diseases

OR:

Odds Ratio

SES:

Socioeconomic status

SSA:

Sub-Sahara Africa

T2D:

Type 2 diabetes

WHO:

World Health Organization

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Acknowledgments

We thank the people in Kasese District, who took time to participate in this study, the field assistants for collecting data and carrying equipment up the Rwenzori mountains, and the Kagando Hospital staff members for their hospitality and support. We also thank Ms. Pernille Kaestel for sharing her expertise in nutrition and advising on the analysis.

Funding

The data collection in Kasese District, Uganda was funded by Novo Nordisk Fonden (grant no. 29847), Thorvald Madsens Fond, Aase and Ejnar Danielsens Fond, and Christian and Otilia Brorsons Rejselegat. None of the sponsors had any influence on the study design; data collection, analysis, or interpretation; or the writing of this article.

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Authors

Contributions

TLFH, JN and DWM came up with the idea and design for the study. Data were initially collected by JN with advice from DWM and SB. DWM and SB contributed with methodological advice. TLFH analysed the data. TLFH and JN interpreted the results. First draft was made by TLFH. All authors read and approved the final draft.

Corresponding author

Correspondence to Therese L. F. Holmager.

Ethics declarations

Ethics approval and consent to participate

Prior to data collection, the aim of the project was verbally explained, and a written information leaflet was read aloud and distributed – in the local language, Lukonjo. At the day of data collection, verbal information was given again and a verbal and written consent (or thumb print) was obtained from all participants. For participants below 18 years of age, a written consent was also obtained from the caretaker. The study protocol was approved by The Uganda National Council of Science and Technology (ADM 154/212/01), Makerere University School of Medicine Research & Ethics Committee, St. Raphael of St. Francis Hospital Nsambya and Kagando Hospital.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Supplementary Information

Additional file 1.

Additional file 2: Table 1.

Food items included in food groups in Kasese District, Uganda (N=359), Food Intake and Cardiometabolic Risk Factors in Rural Uganda study, 2012–2013

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Holmager, T.L.F., Meyrowitsch, D.W., Bahendeka, S. et al. Food intake and cardiometabolic risk factors in rural Uganda. Arch Public Health 79, 24 (2021). https://doi.org/10.1186/s13690-021-00547-x

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Keywords

  • Type 2 diabetes
  • Overweight
  • Cardiometabolic
  • Diet
  • Sub-Saharan Africa