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Fatores associados à Capacidade Antioxidante Total da Dieta da população Brasileira

Factors associated with the Dietary Total Antioxidant Capacity of the Brazilian Population

Mariane Alves Silva1, Lara Gomes Suhett2, Ilana Nogueira Bezerra3; Soraia Pinheiro Machado3

1 Faculdade de Nutrição, Universidade Federal de Mato Grosso, Brasil.
2 Department of Nutrition Sciences, Drexel University, Philadelphia, Pennsylvania, USA
3 Programa de Pós Graduação em Nutrição e Saúde, Universidade Estadual do Ceará, Brasil.

Mariane Alves Silva: mariane.silva3@ufmt.br, ORCID: 0000-0002-6518-6534
Lara Gomes Suhett: nutrilarasuhett@gmail.com, ORCID: 0000-0002-2497-1587
Ilana Nogueira Bezerra: ilana.bezerra@uece.br, ORCID: 0000-0002-2072-0123
Soraia Pinheiro Machado: soraia.arruda@uece.br , ORCID: 0000-0002-3918-4738

*Autor correspondente
Email: nutrimarianealves@gmail.com
Av. Fernando Corrêa da Costa, nº 2367, Boa Esperança - Cuiabá - MT
CEP: 78060-900
(65) 3615-8000

RESUMO
Objetivo: avaliar se condições socioeconômicas e demográficas estão associadas à Capacidade Antioxidante Total da Dieta (CATd) da população brasileira.
Métodos: estudo realizado com 46.164 brasileiros com 10 ou mais anos de idade, avaliados pela Pesquisa de Orçamentos Familiares (POF 2017-2018). O consumo alimentar foi avaliado por meio do recordatório de 24 horas, sendo a CATd determinada a partir do somatório do teor de antioxidantes de cada alimento ingerido, a partir de uma base de dados, com informações do valor da CAT em mmol/100g de 3.100 alimentos. Modelos de regressão logística multinomial foram propostos para testar a relação entre fatores socioeconômicos e CATd.
Resultados: A mediana da CATd foi de 3.48 (0.62 – 24.55) mmol/1.000 Kcal. As mulheres, indivíduos de maior idade (adultos e idosos) e moradores da zona rural e regiões Nordeste, Sul e Sudeste do país apresentaram uma maior ingestão de antioxidantes. Por outro lado, indivíduos com maior escolaridade e renda apresentaram menor valor da CATd.
Conclusão: a situação socioeconômica e demográfica associou-se ao consumo de antioxidantes, reforçando a importância de identificação dos grupos de risco para alimentação inadequada, para melhor direcionamento na implementação de políticas públicas e intervenções nutricionais.
Palavras-chaves: Dieta, Consumo alimentar, Antioxidantes, fatores socioeconômicos

ABSTRACT
Objective: To assess whether socioeconomic and demographic conditions are associated with the Dietary Total Antioxidant Capacity (DTAC) of the Brazilian population.
Methods: Study conducted with 46,164 Brazilians, aged 10 or over, evaluated by the Household Budget Survey (Pesquisa de Orçamentos Familiares – POF 2017-2018). Food consumption was assessed through a 24-hour recall, with DTAC determined by calculating the sum of the antioxidant content of the intake of each food, taken from a database containing information on the DTAC value in mmol/100g of 3,100 foods. Multinomial logistic regression models were proposed to test the relationship between socioeconomic factors and DTAC.
Results: The median DTAC was 3.48 (0.62 – 24.55) mmol/1000 Kcal. Women, older individuals (adults and the elderly), and residents of rural areas and the Northeast, South, and Southeast regions of the country showed a higher intake of antioxidants. By contrast, individuals with higher educational and income levels presented lower DTAC values.
Conclusion: The socioeconomic and demographic scenario was associated with the consumption of antioxidants, reinforcing the importance of identifying risk groups for inadequate nutrition in order to better guide the implementation of public policies and nutritional interventions.

Keywords: Diet, Food consumption, Antioxidants, socioeconomic factors

INTRODUCTION

Dietary Total Antioxidant Capacity (DTAC) can be defined as a tool used to evaluate the intake of antioxidants. It consists of an index that is useful when evaluating the quality of one’s diet, since it takes into consideration the several chemical forms of antioxidants in the food, as well as the different levels of antioxidant capacity and the cumulative or synergistic effects they may have upon the body. One study conducted with the American population identified that DTAC may be an important predictor of all-cause mortality1, since its result is directly associated with the level of oxidative stress in the body2. Moreover, this tool may be used as a marker of dietary quality, with implications for research regarding the onset, the installation, and the development of chronic diseases3.
Noncommunicable diseases (NCDs) are responsible for 74% of all deaths worldwide4, and an inadequate diet is considered one of the main risk factors for both the decrease in quality of life and the increase in mortality5. Studies about DTAC have been conducted internationally6,7 and in different age groups8,9. However, studies with Brazilian data are scarce9, especially regarding factors associated with the intake of antioxidants. It is also important to highlight that the results are conflicting in terms of the association between the quality of one’s eating habits and sociodemographic and economic conditions10,11. Therefore, understanding the factors associated with inadequate eating habits, in the perspective of a low consumption of antioxidants, allows for the identification of risk groups for this condition.
Considering that socioeconomic conditions influence one’s diet, and that dietary antioxidant capacity is a modifiable risk factor for the occurrence of NCD, the present study aimed to evaluate how socioeconomic and demographic conditions are associated with DTAC in the Brazilian population.

METHODOLOGY
This is a cross-sectional study that analyzed secondary data from the National Diet and Nutrition Survey (Inquérito Nacional de Alimentação - INA), conducted by the Brazilian Institute for Geography and Statistics (IBGE), in a sub-sample of the latest edition of the Household Budget Survey (Pesquisa de Orçamentos Familiares - POF), 2017-201812.
This survey used a representative sample of the Brazilian population, generating estimates for the five major regions of the country, for rural and urban areas, and for different socioeconomic levels. For sample selection, a common sample – or master sample – was used, designed by the IBGE based on the Integrated System of Household Surveys (Sistema Integrado de Pesquisas Domiciliares - SIPD). A conglomerate sampling plan was used, divided into two stages. The primary sampling units (PSU) were derived from the master sample, which is comprised of a set of census sectors. The selection of PSUs was conducted by sampling, with the probability proportional to the number of households in each sector. In the second stage, households were selected by simple random sampling. The sectors were distributed into the four quarters of the year of the study. Methodology details were described elsewhere13.
In POF 2017-2018, a total of 57,920 households was selected. For the INA, 20,112 households, with 46,164 individuals older than 10 years of age, were evaluated.
Socioeconomic and demographic variables were obtained by means of interviews conducted in the households. The present study used data referent to: sex (female and male), categorized age range (10 to 19, 20 to 59, and 60 years or over), self-reported race/color (white, brown, black, yellow, and indigenous), categorized education (up to 4, 4 to 8, 9 to 11, and 12 or more years of education) , family income in reais (R$) categorized by quartiles (<1927.00; 1927.00 to 3183.73; 3183.74 to 5454.99; >5454.99), household location (urban and rural), and geographic region of the country (North, Northeast, Southeast, South, and Midwest).
Easting was evaluated by means of two recording processes of 24 hours on non-consecutive days, following the multiple steps method14, with detailed information about the quantity consumed, times and places of consumption, times of meals, and ways of cooking specific foods. In the present study, data from the first day of consumption was used. For the estimation of quantity consumed by individuals, the study used the measurement tables of foods consumed in Brazil, according to the the INA 2017-2018, with respective quantities in grams or milliliters. To estimate the amount of calories consumed, the study used the Brazilian Table of Food Composition (Tabela Brasileira de Composição de Alimentos - TBCA), from Universidade de São Paulo (USP), Food Research Center (FoRC), version 7.0 (Available at http://www.fcf.usp.br/tbca).
To determine the DTAC, a database was used with information on the value of the CAT of 3,100 foods in mmol/100g 15. This database was produced through a compilation of laboratorial analyses (FRAP trial) of foods from different countries; therefore, it is possible to verify details about the foods, such as the country of origin and product brand.
Whenever the value of CAT for a food was not available in the database, the values of botanically similar foods were considered. Moreover, when there was no established CAT value for a cooked food, the in natura CAT levels were considered. In terms of culinary preparation, the recipe for preparing the foods was standardized, the ingredients were separated, and the CAT was calculated for each item.
The CAT value for each food, established by the database and relevant articles, was multiplied by the quantity consumed in grams, resulting in the antioxidant content consumed in each food. The DTAC was calculated by determining the sum of the antioxidant capacity of all of the foods consumed16, and the final value is expressed in 1,000 Kcal, with the purpose of adjusting the consumption by the total energy in the diet. Other studies have conducted energetic adjustment as well8,9, aimed at analyzing the effect of the nutrient with no energetic influence17.
The results were described in averages when they were continuous variables, or in frequency percentages when categoric, with their respective 95% confidence intervals, given the complexity of the design and the sample weights. The normality of the data was evaluated by the Shapiro-Wilk test. To compare the DTAC averages among the evaluated groups, the Student t test and ANOVA with Bonferroni post hoc were used.
The total antioxidant capacity of the diet in each quartile was considered to be a dependent variable, and the socioeconomic and demographic conditions of individuals, to be the explanatory variables. Models of multinomial logistic regression were proposed in order to establish the relationship between dependent and independent variables. As such, a bivariate analysis was conducted with the variables, and the predicting variables which presented a p-value below 20%, were inserted into the multivariate regression model by means of the backward method. Those with less significance were removed from the model one by one. The procedure was repeated until all of the variables present in the model had statistical significance. The level of statistical significance adopted in this study was 5%.
The analyses were conducted in the Strata program, version 14.0 (SPSS Inc., Chicago, IL, USA).

RESULTS

Among the evaluated individuals, the majority were female, adult, of black or brown race, and residing in urban areas. Almost half of the individuals had 12 or more years of education and resided in the Southeast region of the country (Table 1).
The DTAC value ranged from 0.62 to 24.55 mmol/1,000 Kcal, with a 3.48 mmol/1,000 Kcal median. Women showed a significantly higher intake of antioxidants than men. Likewise, teenagers showed a lower intake of antioxidants in comparison to adults and the elderly. Differences were also observed in the intake of antioxidants according to geographic region. The lowest and the highest consumption of antioxidants were observed in the North and South regions of the country, respectively (Table 1).
After the bivariate analysis, it was observed that women had a 1.7-fold higher prevalence in the consumption of antioxidants (last quartile) when compared to men. Moreover, adults and elderly residing in rural areas and living in the Northeast, Southeast, and South regions of the country also presented a higher consumption of antioxidants. Furthermore, individuals with higher educational and income levels showed a lower prevalence in terms of belonging to the last quartile of the DTAC scores, in other words, less prevalence in having a diet with more antioxidant potential (Table 2).
In the final model, a higher prevalence of a better antioxidant diet (last quartile) was observed in female individuals, adult and elderly, and residing in rural areas. Moreover, residents from the Northeast, South, and Southeast regions presented a diet with more antioxidant potential. In contrast, higher educational and income levels were inversely associated with higher antioxidant consumption (Table 3).

DISCUSSION

In the present study, the socioeconomic and demographic situation was significantly associated with the consumption of antioxidants. Individuals who were female, either adult or elderly, residing in rural areas and in the Northeast, South, and Southeast regions of the country had a diet with more antioxidant potential. On the other hand, lower educational and income levels were associated with lower DTAC.
The daily consumption of antioxidants was 5.2 ± 6.1 mmol/1,000 Kcal. To the best of our knowledge, this is the first study to evaluate DTAC in the Brazilian population, based on a significant sample and taking into consideration all of the foods ingested in one day. Koehnlein et al. (2014)18 used data from POF 2008-2009 to evaluate the level of antioxidants in the 36 foods most eaten by Brazilians and found an average of 10.3 mmol/d. Still, the DTAC found in this study is lower than that observed among Iranian adults (7.8 mmol/d)19. However, such differences may be attributed, in part, to the energetic adjustment used in our work, which is not present in other studies. Such an adjustment has the purpose of preventing that the effect of one specific nutrient being confounded or distorted by the total energetic consumption of the individual17.
Women presented a higher intake of antioxidants, which corroborates with other studies that proved that the female population has a better quality of diet, takes better care of health and the body20, has better nutritional knowledge, and includes healthier foods in her diet21. Evidence indicates that women consume more fruits, vegetables, and legumes than do men11, and these food categories are among those that contribute the most in terms of antioxidants22. It is important to remember that the tea category provides a great contribution for the antioxidant potential of the diet9, and it is more commonly consumed by the female segment, with the purpose of losing weight, among other reasons23.
Age was among the factors associated with dietary antioxidant potential in the Brazilian population. Adults and elderly individuals showed a higher intake of antioxidants when compared to teenagers. It is assumed that older individuals are more prone to the adoption of a healthy lifestyle due to the understanding of the importance of an adequate diet for health, or because it is required to treat an NCD, given that the segment has a higher prevalence of such diseases24. Moreover, generational differences in food consumption may explain the fact that adults and elderly individuals have a higher quality diet. Hence, their eating habits were acquired at a time when there was less availability of ultra-processed foods25.
This finding is worrisome, since an increase has already been noticed in terms of NCDs among young individuals26. Moreover, worse quality diets during adolescence may favor the adoption of habits that will last into adult life and favor the event of diseases associated with inadequate eating habits5,26. One study, which evaluated the evolution of the foods most consumed in Brazil between 2008-2009 and 2017-2018, identified a reduction in the consumption of fruits by the population, which was more evident among teenagers27.
In terms of household location, residents of rural areas showed diets with more antioxidant potential in comparison to individuals from urban areas. The analysis of the data on the availability of foods in Brazilian households already demonstrates important distinctions in the acquisition of foods for household consumption, when comparing the rural and urban areas of the country. Households in rural areas, as compared to urban areas, showed more in natura or minimally processed foods than processed culinary ingredients in one’s diet (58.2% vs. 47.1% and 24.5% vs. 21.1% of the total calories, respectively). By contrast, the participation of both processed ultra-processed foods was larger in urban areas (11.1% and 20.6%, respectively) when compared to rural areas (5.8% and 11.5%)28. In natura and minimally processed foods include legumes, vegetables, beans, tubers, among others, which are items that contain a higher amount of antioxidants8,22. Corroborating with this data, an analysis by the National Health Survey (NHS) demonstrated that Brazilians residing in rural areas had a higher frequency of the consumption of in natura and minimally processed foods, highlighting the consumption of beans, which was more common in rural than in urban areas (OR=1.20; 95% CI: 1.14-1.26), regardless of sex, age, race, education, and region of the country; meanwhile the residents of urban areas presented a higher intake of ultra-processed foods29.
In the present study, individuals with higher income and educational levels presented a lower intake of antioxidants. Our results are opposite to those in the study by Jun et al. (2017)8, conducted with Korean adults, which identified that a low socioeconomic status was associated with a lower consumption of antioxidants. However, one study based on data from POF 2017-2018 identified that individuals with greater purchasing power adhere more to the “Western” standards30, whereas the typically Brazilian foods, such as rice and beans, were consumed more often by individuals with a lower income31. The traditional combination of rice and beans is responsible for a high contribution in the intake of phenolics and flavonoids, as well as high DTAC18.
The relationship between the quality of one’s diet and socioeconomic status is still controversial. Some studies have found evidence of a direct relationship between income and education, and more access to healthy foods, given the higher purchasing power32,33. On the other hand, higher socioeconomic status is also associated with a higher consumption of ultra-processed foods34, suggesting that socioeconomic status may increase access to foods in Brazil, impacting food consumption; however this does not necessarily result in a higher quality diet. The fact that individuals with less income and a lower educational level present a higher average intake of antioxidants may be related to matters of access to foods, since the traditional foods in the Brazilian diet, such as beans and some regional fruits, still have a lower cost35.
The Northeast, South, and Southeast regions presented a diet with more antioxidant potential when compared to the northern part of the country. A higher prevalence of healthier eating standards, which include fresh or cooked vegetables and legumes, chicken, fruits, natural fruit juice, and milk, was verified in the South and Southeast regions of the country36. According to Malta et al. (2015)37, the Midwest and Southeast are the Brazilian regions with the highest daily consumption of fruits and vegetables, followed, in decreasing order, by the North, South, and Northeast region. The fact that the Northeast has presented a high consumption of antioxidants may also be explained by the access to cheaper foods in the region, which, however, have high levels of these nutrients.
This study has, as a limitation, the fact that it used a theoretical data bank for DTAC evaluation. However, although such limitation is inherent to the tool, DTAC has been widely recommended as a good marker for dietary quality3 and a good predictor of all-cause mortality1. As one of the strengths of this study, we highlight that it is the first study of its kind conducted with a representative sample of the Brazilian population, which evaluated the antioxidant content of the diet, taking into consideration all of the foods consumed. Moreover, it is important to mention that the POF 2017-2018 is considered to be the most complete, as well as the most up-to-date, databank in the country for studies of this nature.
In conclusion, the present study identified that socioeconomic and demographic conditions were significantly associated with the consumption of antioxidants. Individuals who are female, both adult and elderly and residing in rural areas of the Northeast, South, and Southeast regions of the country, presented a diet with more antioxidant potential. By contrast, higher educational and income levels were associated with a lower DTAC. Such results reinforce the importance of the identification of risk groups in terms of inadequate diet, aiding in the design and implementation of public policies and nutritional interventions, which may promote healthy eating, together with a higher level of antioxidants.

Conflict of Interest: The authors declare no conflicts of interest.

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