Food and nutrition security is the guaranteed right for all to have access to safe, healthy and nutritious foods in adequate amounts, respecting cultural and social preferences( 1 , 2 ). The violation of this leads to household food insecurity (HFI), which can range from mild (concerns with food shortage and poor quality of foods due lack of money) to severe (occurrence of hunger)( 3 ). In Brazil, HFI is measured by national surveys using the Brazilian Food Insecurity Measurement Scale (Escala Brasileira de Insegurança Alimentar, EBIA)( 3 ).
Since 2004 Brazil has generated data on household food security from three National Household Representative Surveys( 4 ). Analyses of these data have identified black or brown skin colour, low income and education, and poor health as risk factors for HFI( 3 , 4 ).
In 2004 the prevalence of food insecurity among black and brown individuals was 43·4 % compared with 24·6 % among whites. Between 2004 and 2013 this prevalence decreased but still remained higher among black and brown individuals than whites (33·4 v. 17·2 %, respectively). In 2013 over half (50·7 %) of the Brazilian population self-identified as having black or brown skin( 5 ), a characteristic associated with illiteracy and low income. Specifically, illiteracy was 11·8 % among black and brown individuals and 5·3 % among whites; furthermore, 14·1 % of the black and brown individuals and 5·3 % of the white population were in the lowest income decile. Conversely, among the richest 1 % of the population, only 16·2 % were blacks and 81·6 % were whites( 5 ).
Even though black slavery in Brazil ended in 1888, communities for black individuals still experience major socio-economic inequities, especially among those living in slave-descendant communities. These communities are named Quilombos and the people living in them are known as Quilombolas. Quilombos are communities predominantly located in the rural areas of Brazil that were originally founded by runaway black slaves during the slavery period. Quilombos were legally recognized in the Brazilian Constitution in 1988( 6 ), although only a few of them were given the right to ownership of their lands. These communities are distributed all over the country and have a relative degree of geographical isolation, a situation associated with difficulties in accessing basic goods and services( 7 – Reference Oliveira e Silva, Guerrero and Guerrero 9 ). In addition to poverty, Quilombolas experience other social exclusion risk factors including lack of Brazilian State official recognition of their lands, lack of political power and loss of their historically constructed cultural identity( Reference Oliveira e Silva, Guerrero and Guerrero 9 , Reference Carvalho and Oliveira e Silva 10 ). Quilombolas are legally eligible for social programmes (e.g. the Bolsa Família conditional cash transfer programme), to preferential policies to improve their access to land, to infrastructure development, to actions to promote quality of life, to support for local production and economic autonomy, and to strategies aiming to promote and protect their rights and citizenship (Programa Brasil Quilombola)( 11 ). Unfortunately, to date, these policies have not improved the quality-of-life situation of Quilombolas substantially.
Qualitative and quantitative studies using indirect indicators have shown that Quilombolas communities are at a very high risk of food insecurity( 7 – Reference Oliveira e Silva, Guerrero and Guerrero 9 ). Quilombolas communities in general have high illiteracy rates, low income, poor access to programmes of several social and agricultural public policies, and difficulties in getting their land ownership legally recognized( Reference Oliveira e Silva, Guerrero and Guerrero 9 ). The situation of extreme poverty faced by most of the Quilombolas families exposes them to food shortages and poor dietary quality, contributing to malnutrition, diseases and other negative health outcomes( 2 , 7 , Reference Oliveira e Silva, Guerrero and Guerrero 9 ).
The present study aimed to identify the factors associated with food insecurity among Quilombolas communities in Brazil. In contrast to previous studies, our analysis is based on a direct measure of household food security using the experience-based Brazilian HFI scale (EBIA). Thus, the study’s findings can help guide the Government to improve the design and focus of household food security policies for Quilombolas that are still affected by a legacy of major historical inequalities( 11 ).
Methods
We analysed secondary data from a Census of 169 officially recognized Quilombolas Brazilian territories. This national census was conducted in 2011 under the coordination of the Ministry of Social Development and Fight Against Hunger (Ministério de Desenvolvimento Social e Combate à Fome, MDS) and the identified database is available in the public domain.
The Quilombolas Census assessed the living conditions of 9191 households distributed across fifty-five municipalities located in fourteen Brazilian States, including households with or without children( 2 ). The present study used the household as the unit of analysis and included only those that had complete information regarding the EBIA items (8856 households).
HFI was measured by EBIA. EBIA was originally a fifteen-item scale, but in 2010 one of the questions was excluded as a result of new psychometric analyses( 3 ). Thus, even though the fifteen-item EBIA scale was applied in the Quilombolas survey, we only used the recommended fourteen-item scale in our analyses. EBIA measures different HFI intensities, ranging from questions about worries about running out of food to questions about children not eating for a whole day. An additive household score was computed based on the number of affirmed questions. Based on this score, households were classified as: food secure (score=0), mildly food insecure (score=1–5), moderately food insecure (score=6–9) or severely food insecure (score=10–14)( 3 ). EBIA is an adapted and validated version of the US Household Food Security Survey Module( Reference Bickel, Nord and Price 12 ). The validation process of EBIA in Brazil included Quilombolas communities in the states of São Paulo and Mato Grosso, for both qualitative and quantitative phases, and concluded that EBIA is a valid scale to assess the HFI situation of Quilombolas populations( Reference Segall-Corrêa, Pérez-Escamilla and Marin-León 13 ).
We conduced descriptive socio-economic and demographic analyses for Quilombolas households located in each one of the five Brazilian regions. These regions have different environmental, climatic and socio-economic characteristics. The following variables were investigated: region; educational level of the head of household; monthly per capita household income, with extreme poverty defined as a monthly per capita income below $US 44( 14 ); enrolment in governmental social assistance programmes, namely the conditional cash transfer programme (Programa Bolsa Família), food assistance programme (Programa Cesta de Alimentos), water cistern supply programme (Programa Cisternas), family agriculture strengthening programme (Programa Nacional de Fortalecimento da Agricultura Familiar, PRONAF) and agriculture subsidy programme (Programa Garantia Safra); household adequate sanitation, defined as having public sewage system or a septic tank; adequate water supply, defined as water available from the public service or appropriately collected spring water; number of individuals in the household; number of children in the household; household visit from a community health worker in the past 2 months; health coverage by the family health programme (Programa Saúde da Família); enrolment in the federal government’s single registry (Cadastro Único), an institutional mechanism for accessing the conditional cash transfer and other social protection programmes; household presence of person with physical disability; employment status of the head of the household (employed or receiving government retirement; and characteristics of the employment: formal or informal); and earnings from the sale or growth of foods.
The Programa Bolsa Família is a conditional cash transfer programme for the population living in extreme poverty and provides monthly basic allowances with an additional amount of cash transfer according to the number of eligible individuals in the household. The Programa Cesta de Alimentos distributes food supplies to families in emergency or disaster situations and to specific population groups at high risk of food shortage such as indigenous and Quilombolas communities. The Programa Cisternas aims to promote access to water for human consumption and food production in dry areas by implementing low-cost technologies to store rainwater( 15 ). PRONAF subsidizes credits for small-scale farmers aiming to reduce rural poverty and to promote sustainable rural development. The Programa Garantia Safra has the objective to guarantee minimum earnings to small family farmers susceptible to crop losses due to drought or flood( 16 ). The Programa Saúde da Família is a health strategy focused on primary health care that includes multidisciplinary teams working in health promotion and disease prevention/control, as well as in the provision of routine care to communities (including visits from community health workers). In Brazil, all individuals, no matter their social status, are entitled to receive free health assistance from the Brazilian Unified Health System or SUS.
The four-level household food (in)security dependent variable was used in the bivariate analyses. For the adjusted analyses, a dichotomous dependent variable was created by combining secure and mildly food insecure into one category (reference group) and moderately and severely food insecure into the other category. We combined HFI categories as done in previous studies( Reference Cabral, Lopes and Lopes 17 , Reference Ferreira, Souza and Moura 18 ), allowing us to contrast two distinct HFI groups. The food secure/mild food insecure group is expected to not experience or to experience small reductions in dietary quality, without reductions in amount of food or following unusual food access coping patterns. By contrast, the moderately/severely food insecure is expected to experience major deterioration in dietary quality and quantity to the point of having household members experiencing hunger once the coping strategies used to sustain energy intake become ineffective( Reference Bickel, Nord and Price 12 ).
Bivariate analyses were performed using the χ 2 test to investigate the association between demographic and socio-economic variables and the dependent variable (HFI). Subsequently, a multivariate analysis with a binary logistic regression model was conducted to generate unadjusted odds ratios for HFI.
Adjusted analyses were performed using a logistic regression model to calculate adjusted odds ratios for HFI (ORadj). We included the independent variables that in the bivariate analyses were associated with HFI with P<0·10. Initially we included the block of distal independent variables (i.e. sanitation, water supply, earnings from the sale or growth of foods, enrolment in social programmes (Cadastro Único, Programa Bolsa Família, Programa Cesta de Alimentos, Programa Cisternas, Programa Garantia Safra, PRONAF and Programa Saúde da Família) and visit of the community health worker). Then we tested the block of proximal independent variables, such as household presence of person with physical disability, employment status of the head of the household, number of individuals in the household, number of children in the household, income and educational level. The final model included the variables that remained associated with HFI with P<0·05. These were: per capita household income, educational level of the head of the household, region, Programa Bolsa Família, Programa Cisternas, Programa Garantia Safra, adequate water supply, adequate sanitation, number of individuals in the household, provision of care by the Programa Saúde da Família and employment status of the head of the household. The final P value for model fit was <0·001.
All analyses were performed using the statistical software package IBM SPSS Statistics Version 20.0. The data came from a Census including all Quilombolas households, thus sample weights were not needed for the statistical analysis.
Results
The present study found a low prevalence of food security (14·4 %) and a high prevalence of severe HFI (47·8 %) among the Quilombolas population. The majority of Quilombolas lived in the North and Northeast regions (84·3 %; data not shown). In the North of Brazil, severe HFI affects 62·3 % of the Quilombolas (Table 1).
Descriptive analysis of the population: demographic aspects of the Quilombolas population in Brazil and its regions. Brazil, Census of Titled Quilombola Communities (Censo de Comunidades Quilombolas Tituladas), 2011
PRONAF, Programa Nacional de Fortalecimento da Agricultura Familiar.
The educational level of the Quilombolas was low, with 31·2 % of heads of household having less than 4 years of education and only 1·8 % having more than 9 years. The majority of the Quilombolas lived with a monthly per capita household income below $US 44 (45·0 %). The prevalence of extreme poverty among the Quilombolas living in the North region was 48·4 % v. 15·7 % among Quilombolas from the South/Southeast.
With regard to social programmes, 61·2 % of Quilombolas households received a cash transfer from Programa Bolsa Família. Only 14·8 % of Quilombolas households had adequate sanitation and 44·1 % had adequate water supply. Our data showed that 38·6 % of the heads of household were unemployed, the majority of whom lived in the Midwest region (58·7 %), and only 10·0 % of them had a formal employment contract. Only 21·8 % of Quilombolas households complemented their income with the sale or growth of foods, a percentage that was highest in the North region (26·5 %).
The analysis of the association between the variables investigated and HFI status (Table 2) showed that higher socio-economic conditions were inversely associated with HFI. Crude regression analysis revealed that households located in the North region of Brazil had 19·22 (95 % CI 14·52, 25·44) times higher odds of experiencing moderate or severe food insecurity than those located in the South or Southeast region of Brazil. Similarly, households whose head had less than 4 years of education (OR=2·54; 95 % CI 1·84, 3·50) and those with monthly per capita household income below $US 44 (OR=4·19; 95 % CI 3·72, 4·72) were more likely to present a higher prevalence of severe HFI. Households that were not receiving cash transfer from Programa Bolsa Família (OR=0·51; 95 % CI 0·46, 0·56), were not registered in Cadastro Único (OR=0·55; 95 % CI 0·50, 0·61) and were not receiving earnings from selling or growing foods (OR=0·59; 95 % CI 0·52, 0·66) had a lower prevalence of moderate or severe HFI.
Determinants of food and nutrition insecurity and demographic aspects in the Brazilian Quilombolas population. Brazil, Census of Titled Quilombola Communities (Censo de Comunidades Quilombolas Tituladas), 2011
PRONAF, Programa Nacional de Fortalecimento da Agricultura Familiar.
* All analysed variables showed statistical significance in the bivariate analysis using the χ 2 test and considering a significance level of P<0·05.
† OR considering food-secure and mildly food-insecure households as the reference category v. moderately and severely food-insecure households.
Adjusted logistic regressions analyses showed that households located in the North v. the South/Southeast region (ORadj=11·26; 95 % CI 7·83, 16·19), who had heads of household with low levels of education (ORadj=1·92; 95 % CI 1·29, 2·85) and in extreme poverty (ORadj=2·78; 95 % CI 2·36, 3·29) had higher odds of moderate to severe food insecurity (Table 3).
Determinants of food and nutrition security and demographic aspects in the Brazilian Quilombola population. Brazil, Census of Titled Quilombola Communities (Censo de Comunidades Quilombolas Tituladas), 2011
* All analysed variables showed statistical significance in the bivariate analysis using the χ 2 test and considering a significance level of P<0·05. Adjusted OR by monthly per capita household income, educational level of the head of the household, region, Programa Bolsa Família, Programa Cisternas, Programa Garantia Safra, adequate water supply, adequate sanitation, number of individuals in the household, provision of care by Programa Saúde da Família and employment status of the head of the household.
† OR considering food-secure and mildly food-insecure households as the reference category v. moderately and severely food-insecure households.
Households that did not have access to Programa Cisterna and Garantia Safra had 1·35 (95 % CI 1·06, 1·72) and 1·43 (95 % CI 1·41, 1·85) times higher chance of experiencing moderate/severe HFI, respectively. Households not receiving benefits from Programa Bolsa Família were less likely to experience the most severe forms of food insecurity (ORadj=0·66; 95 % CI 0·58, 0·75). Moreover, households that did not have access to the Programa Saúde da Família had 1·40 (95 % CI 1·25, 1·58) times higher adjusted odds for moderate/severe HFI (Table 3).
Households without adequate sanitation (ORadj=1·88; 95 % CI 1·61, 2·19) and without adequate water supply (ORadj=1·23; 95 % CI 1·10, 1·39) were more likely to present moderate/severe HFI. Finally, households whose head was unemployed had 1·11 (95 % CI 0·98, 1·26) times higher adjusted odds of experiencing moderate/severe HFI.
Discussion
The prevalence of HFI observed in the Quilombolas Census (85·6 %) was higher than that found in smaller studies that also used the EBIA to evaluate HFI. Investigating Quilombolas communities in the state of Tocantins (North Brazil), Monego et al. ( Reference Monego, Peixoto and Cordeiro 8 ) found that 85·1 % experienced HFI, with 32·9 % experiencing moderate HFI and 14·9 % severe HFI. In that study HFI was associated with community-level variables such as water supply, sewage and garbage collection infrastructure. Cordeiro et al. ( Reference Cordeiro, Monego and Martins 19 ) found in Quilombolas communities in the state of Goiás (Midwest Brazil) a prevalence of 74·2 % of HFI, with 45·1 % having mild HFI, 21·6 % having moderate HFI and 8·5 % severe FI. The risk factors identified for HFI in these two smaller studies are highly consistent with those found in the present census analysis of officially recognized Quilombolas territories( Reference Monego, Peixoto and Cordeiro 8 , Reference Cordeiro, Monego and Martins 19 ). The studies conducted in the North and Midwest used the old EBIA version with fifteen items v. the fourteen-item EBIA, that excluded the weight loss item, used in our study. However, this difference in metric used does not explain the differences in HFI prevalence across studies as the HFI categories’ classification is comparable between the fourteen-item and the fifteen-item scale( Reference Segall-Corrêa, Marin-León and Melgar-Quiñones 20 ). The difference between these lower HFI estimates and ours is likely to be due to the differences in samples studied, namely a representative national sample v. a local sample, as well as sampling exclusion criteria. For example, the study in the Midwest enrolled only families with children attending public schools located near cities, and excluded remote communities which are the poorest ones and less likely to be able to benefit from public policies( Reference Cordeiro, Monego and Martins 19 ).
There was a clear contrast between the North and Northeast regions and the remaining three Brazilian regions. These two regions have worse economic, social and health indicators compared with the others, including food shortages and food deprivation as documented in prior studies( 3 , Reference Gubert, Benício and Santos 21 ). These findings confirm the persistence of geographical inequalities in the social determinants of health across regions in Brazil. Bezerra et al.( Reference Bezerra, Andrade and César 22 ) found a high prevalence of hypertension associated with socio-economic and demographic factors such as economic class and education among Quilombolas in a Northeast Brazilian municipality (Vitoria da Conquista). Kochergin et al. ( Reference Koshergin, Proietti and César 23 ) found in the same community that self-rated health was associated with socio-economic and demographic indicators, lifestyle, social support and health status. Gomes et al. ( Reference Gomes, Reis and Guimarães 24 ) documented an underutilization of health services by members of this same community.
Socio-economic and demographic determinants of poverty strongly influence ethnic/racial differentials in health and well-being in Brazil. In addition to the Quilombolas, the entire black and brown population experiences more socio-economic deprivation compared with its white counterpart( 3 ). Even though people of colour represent more than 50 % of the Brazilian population( 25 ), in 2009 blacks accounted for only 24 % of those in the richest income decile( 26 ). Homicide victims in Brazil are most likely to be young, male, black and with few years of education, showing the marginalization of people of colour within Brazilian society( Reference Murray, Cerqueira and Khan 27 ). Black men had an average of 6·7 years of studying, compared with 8·4 years for white men( 26 ). Thus the ethnic/racial inequities in Brazil go beyond the Quilombolas land borders.
Regarding educational level, our results are similar to those of a previous study showing that the majority of Quilombolas had low levels of literacy or had just a few years of education( Reference Oliveira e Silva, Guerrero and Guerrero 9 ). Our findings revealed that low educational level and poverty are risk factors for HFI among Quilombolas and this is supported by the fact that educational level is a major social determinant of health and well-being; indeed, it is the main determining factor of personal income in Brazil( 3 ).
Consistent with our results, a previous study documented that low income and extreme poverty were frequent among Quilombolas. Oliveira e Silva et al.( Reference Oliveira e Silva, Guerrero and Guerrero 9 ) observed that 29·7 % of Quilombolas families living in a state localized in North Brazil did not generate any income. Our results about unemployment are consistent with those reported in the Quilombolas Nutritional Survey in 2006( 7 ) and in Oliveira e Silva et al.’s study( Reference Oliveira e Silva, Guerrero and Guerrero 9 ). In those two studies low income was explained at least in part by the high levels of unemployment in Quilombolas families.
Consistent with previous studies, our findings strongly support the conclusion that HFI is the result of income inequities and the social exclusion resulting from it. Low income is an important risk factor for HFI in Quilombolas because it is associated with less access to food( Reference Anschau, Matsuo and Segall-Corrêa 28 ). Low income can be the result of a lack of access to agriculture as a source of income, the legal problems with land ownership that this population experiences, and the illiteracy prevalence that reduces the employment and better income opportunities( 2 , 7 , Reference Oliveira e Silva, Guerrero and Guerrero 9 ). The lack of land ownership is an important challenge because of its major economic and social repercussions. Even if Quilombolas communities legally own their land, they often suffer expropriation by ranchers and land grabbers. These territorial issues make them revive the struggle for land and social injustices experienced by their ancestors with implications for income generation( Reference Furtado, Pedroza and Alves 29 ).
In the past, Quilombolas had a traditional relationship with the land providing food and with subsistence agriculture being very important for their food security( Reference Furtado, Pedroza and Alves 29 ). Nowadays, however, this has changed as the agricultural activities in Quilombolas communities have become increasingly difficult to maintain due to lack of credit, lack of tools, high production costs and low selling prices of crops. Furthermore, ecosystem degradation and climate change have diminished the availability of foods from fishing and hunting and have hindered the fertility of the soil( Reference Oliveira e Silva, Guerrero and Guerrero 9 , Reference Carvalho and Oliveira e Silva 10 ). These major agriculture-related shifts have been accompanied by increased proximity to roads leading to urban areas and structural economic changes, including access to social programmes and wage labour, both of which have been associated with increased consumption of processed foods( Reference Cordeiro, Monego and Martins 19 ). As a result, younger generations have lost their connection to the land and agriculture and their access to food has been monetized.
Widespread poverty has been associated with HFI among Quilombolas and the Brazilian population in general( 3 ). On one hand, our study showed that families that did not receive benefits from Progama Bolsa Família were less likely to experience moderate and severe food insecurity, and the result remained statistically significant after adjusting for socio-economic and demographic confounders. This can be explained by the programme’s focus, showing that it is well targeted( Reference Segall-Corrêa, Marin-León and Pérez-Escamilla 30 ). People enrolled in this programme are in extreme poverty and experience worse conditions of HFI than those not enrolled; thus this cross-sectional finding is simply likely to be explained by reverse causality. On the other hand, families not participating in Programa Cisternas and Programa Garantia Safra had a higher chance of living in moderately or severely food-insecure households. This important finding shows the importance of these very specific programmes assisting vulnerable populations living in regions where weather conditions may generate water scarcity for consumption and for food production (Brazilian semi-arid region)( 15 , 16 ). The Cisternas programme is responsible for maintaining water accessibility during dry seasons, for individual consumption or agricultural use( 15 ). The food security concept includes access to clean water( 1 ). Quilombolas communities’ access to safe drinking-water and sewage systems is indeed limited, as shown before in previous studies( Reference Monego, Peixoto and Cordeiro 8 , Reference Oliveira e Silva, Guerrero and Guerrero 9 ). This situation is closely related to a high prevalence of parasite infections and diarrhoeal diseases in the Quilombolas population( Reference Andrade, Leite and Vieira 31 ). The Programa Garantia Safra ensures that Quilombolas will be paid fairly for the food they are producing, guaranteeing minimum earnings to small family farms susceptible to crop losses due to drought or flood( 16 ).
Access to the Programa Saúde da Família and to community health worker visits was mostly limited within households experiencing food insecurity, especially in those with the most severe forms of food insecurity. These findings corroborate those of other studies showing that Quilombolas have limited access to health-care services due to income-related factors and their geographical isolation, thus reinforcing social vulnerability( Reference Gomes, Reis and Guimarães 24 , Reference Guerrero, Oliveira e Silva and Toledo 32 – Reference Volochko 34 ). A new programme named Mais Medicos was launched in 2013 in Brazil and initial analyses showed that the programme was providing access to doctors in primary health-care teams in remote rural municipalities with presence of Quilombolas communities( Reference Pereira, Santos and Santos 35 ). It remains to be seen if the improvement of Quilombolas health care will also have impact on their household food security status.
The current study has some limitations. Although HFI was measured directly by EBIA, food consumption data were not available. Food consumption data may have helped characterize dietary quality at the household and intra-household levels. The high prevalence of HFI and the homogeneity of living conditions experienced by Quilombolas also may have made it more difficult to uncover more associations between socio-economic variables and HFI. Moreover, the present data were collected in communities officially recognized as Quilombolas, leaving out those families without land titles who may have had worst HFI status. Another limitation is the small number of previous studies investigating Quilombolas in Brazil, limiting us to compare our findings with only a handful of previous studies conducted in small samples or single communities( Reference Monego, Peixoto and Cordeiro 8 , Reference Oliveira e Silva, Guerrero and Guerrero 9 , Reference Cordeiro, Monego and Martins 19 ). In spite of these limitations, our study is innovative because is based on a Census survey providing the most comprehensive analysis of HFI among Quilombolas to date. It is our hope that our findings will bring to the attention of the international community the prevalent social exclusion condition and food security needs of black-slave descendant communities in Brazil. In addition to the international perspective, the scientific evidence certainly supports revision of Brazilian public policies aimed to eliminate inequities experienced by Quilombolas ( Reference Pérez-Escamilla 36 ).
Conclusion
Food insecurity was highly prevalent in Quilombolas households and, as expected, was directly associated with socio-economic factors. There were clear HFI inequities across different Brazilian regions. Quilombolas in Brazil experience high levels of HFI, but also poor quality of life, poor health, poor diet and non-dignified living conditions. Thus, the historical legacy of social exclusion and social vulnerability continues to be strongly present among those of black slave descent.
Through this innovative census application of EBIA in a highly vulnerable context, the findings can help Brazil improve food security governance among Quilombolas communities( Reference Pérez-Escamilla 36 ). Although there are several public policies, social programmes and benefits currently established in Brazil, there still is a low coverage in Quilombolas communities. In order to improve living conditions and, consequently, the food and nutrition security status in Quilombolas communities, the Government should take into account the needs and wants of this population regarding access to basic rights as well as the governmental social programmes. These programmes should include actions that promote credit and access to tools for family agriculture, respect culturally accepted dietary practices, foster food and nutrition education activities that promote healthy diets, and improve sanitation conditions and hygiene practices that increase the biological utilization of foods, thereby ensuring food security in all its dimensions.
Acknowledgements
Financial support: This research was funded by the Ministry of Social Development and Fight Against Hunger (Ministério de Desenvolvimento Social e Combate à Fome, MDS) and the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq) (grant numbers 456699/2013-9 and 232569/2014-2). MDS and CNPq had no role in the design, analysis or writing of this article. Conflicts of interest: None. Authorship: M.B.G. designed the proposed study analysis; A.M.S., J.P., S.E.A.C.C. and A.M.S.-C. performed statistical analyses; A.M.S., J.P. and S.E.A.C.C. wrote the first version of the manuscript; A.M.S.-C. helped in resolving methodological issues; M.B.G., R.P.-E. and A.M.S.-C. made substantial contributions to the interpretation of results and writing of the manuscript. All authors approved the final version of the manuscript. Ethics of human subject participation: Ethics approval was not required for this paper. The data are secondary and came from a national census including all Quilombolas households made by the Brazilian Government. We used de-identified data available in the public domain. This study was exempt from approval by a research ethics committee.
