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Jornal de Pediatria

Print version ISSN 0021-7557

J. Pediatr. (Rio J.) vol.90 no.1 Porto Alegre Jan./Feb. 2014

https://doi.org/10.1016/j.jped.2013.02.024 

Review articles

Does breastfeeding influence the risk of developing diabetes mellitus in children? A review of current evidence

Patrícia Feliciano Pereiraa  * 

Rita de Cássia G. Alfenasb 

Raquel Maria A. Araújob 

aUniversidade Federal de Viçosa, Viçosa, MG, Brazil

bDepartment of Nutrition and Health, Universidade Federal de Viçosa, Viçosa, MG, Brazil


ABSTRACT

OBJECTIVE:

The aim of this study was to perform a review to investigate the influence of breastfeeding as a protective agent against the onset of diabetes in children.

SOURCES:

Non-systematic review of SciELO, LILACS, MEDLINE, Scopus, and VHL databases, and selection of the 52 most relevant studies. A total of 21 articles, specifically on the topic, were analyzed (nine related to type 1 diabetes and 12 to type 2 diabetes).

DATA SYNTHESIS:

The duration and exclusivity of breastfeeding, as well as the early use of cow's milk, have been shown to be important risk factors for developing diabetes. It is believed that human milk contains substances that promote the maturation of the immune system, which protect against the onset of type 1 diabetes. Moreover, human milk has bioactive substances that promote satiety and energy balance, preventing excess weight gain during childhood, thus protecting against the development of type 2 diabetes. Although the above mentioned benefits have not been observed by some researchers, inaccuracies on dietary habit reports during childhood and the presence of interfering factors have been considered responsible for the lack of identification of beneficial effects.

CONCLUSION:

Given the scientific evidence indicated in most published studies, it is believed that the lack of breastfeeding can be a modifiable risk factor for both type 1 and type 2 diabetes. Strategies aiming at the promotion and support of breastfeeding should be used by trained healthcare professionals in order to prevent the onset of diabetes.

Key words: Breastfeeding; Blood glucose; Type 1 diabetes mellitus; Type 2 diabetes mellitus

RESUMO

OBJETIVO:

Realizar uma análise crítica da literatura para avaliar a influência da amamentação no risco de desenvolvimento de diabetes mellitus.

FONTE DOS DADOS:

Revisão não sistemática nas bases de dados SciELO, LILACS, MEDLINE, Scopuse BVS, selecionando-se 52 referências mais relevantes. Especificamente sobre o tema, foram analisadas 21 (sendo 9 para diabetes tipo 1 e 12 para diabetes tipo 2).

SÍNTESE DOS DADOS:

A duração, a exclusividade do aleitamento materno e uso precoce do leite de vaca têm sido apresentados como fatores de risco para o desenvolvimento de diabetes. Acredita-se que o leite humano contenha substâncias que promovem a maturação do sistema imunológico protegendo contra o diabetes tipo 1. Além disso, ele possui substâncias bioativas, que promovem o equilíbrio energético e a saciedade, prevenindo o ganho de peso excessivo da criança e protegendo, consequentemente, contra o aparecimento do diabetes tipo 2. Apesar dos benefícios anteriormente citados não terem sido constatados por alguns pesquisadores, a imprecisão no relato dos hábitos dietéticos da infância e a presença de fatores interferentes têm sido responsabilizadas pela falta de identificação dos efeitos benéficos.

CONCLUSÃO:

Diante das evidências científicas pautadas em grande parte dos estudos, acredita-se que a ausência da amamentação seja um possível fator de risco modificável para diabetes tipo 1 e tipo 2. Estratégias que visem à promoção e ao suporte ao aleitamento materno devem ser adotadas por profissionais de saúde devidamente treinados como forma de prevenir a manifestação da doença.

Palavras-Chave: Aleitamento materno; Glicemia; Diabetes mellitus tipo 1; Diabetes mellitus tipo 2

Introduction

Diabetes mellitus (DM) is among the leading causes of morbidity and mortality, and its worldwide prevalence has increased rapidly, especially in developing countries.1 For Brazil, in 2010 the overall estimated prevalence, including type 1 DM (T1DM) and type 2 DM (T2DM) in adults, was 6.4% (approximately 12 million). It should be noted, however, that the increasing prevalence of the disease is found worldwide. There were 371 million diabetics worldwide in 2012. It is estimated that in 2030, approximately 552 million individuals will have diabetes. This is equivalent to one diabetic patient for every ten adults; for that number to be reached, three new cases will be identified every 10 seconds.2

Although T1DM is less common than T2DM, it has been increasing every year, both in developed and in developing countries. The worldwide prevalence of T1DM is 0.1% to 0.3%, with 78,000 new cases every year, especially among young individuals (< 5 years).2 T2DM affects approximately 7% of the general population.2

Diabetics are at increased risk of developing cardiovascular disease, neuropathies, and nephropathies, with decreased quality of life and survival.3 According to the International Diabetes Federation, diabetes caused 4.8 million deaths in 2012.2 Due to the magnitude of the disease and its impact on public health, identifying measures to prevent its occurrence is of great interest. It is believed that breast milk is able to have a positive impact on health by preventing the manifestation of diseases such as DM.4

In T1DM, the autoimmune destruction of pancreatic β cells is genetically transmitted. However, it appears that not all individuals that have the gene develop the disease. This fact suggests the existence of environmental factors that can control its manifestation. It is believed that the early use of cow's milk, a highly allergenic food,5 and the absence of breastfeeding are responsible for triggering the abovementioned autoimmune process.6 The destruction of β cells occurs on average for ten years, coinciding with the peak incidence of the disease, which occurs between the ages of 10-14 years.7

The association between breastfeeding and T1DM has been demonstrated in a case-control study involving 1,390 preschoolers. That study demonstrated that receiving breast milk for five months or longer acted as a protective factor against diabetes (OR: 0.71, 95%CI: 0.54-0.93).8 Thus, a considerable proportion of diabetes risk was explained by modifiable exposure, and is potentially preventable. The protective effect of human milk has been linked to its anti-infective properties and because its use prevents early exposure to other infectious agents present in other types of milk.9 - 11 However, some researchers have contested this association.12 , 13

Individuals that were breastfed have lower rates of obesity and T2DM than those fed infant formula.14 , 15 The investigated benefits were proportional to the duration of breastfeeding.16 , 17 Such effects have been attributed to appetite regulation and reduced weight gain in breastfed children and/or effects of nutrients or bioactive constituents present in human milk.18 Breastfeeding as protective practice against T2DM has also been demonstrated in several other studies,19 -- 21 but not in all.18 , 22 The divergence in the results of these studies may reflect the existence of biases and confounding factors.

Therefore, a critical review of studies published on the subject was conducted in order to clarify the influence of breastfeeding on the risk of T1DM and T2DM development. This analysis also aimed to identify possible dietary strategies that can be implemented to prevent disease onset.

Methods

A literature review was performed after research in the following electronic databases: Scientific Electronic Library Online (SciELO), Latin American and Caribbean Health Sciences (LILACS), Medical Literature Analysis and Retrieval System Online (MEDLINE), SciVerse Scopus (Scopus), and the Virtual Health Library (VHL). The search prioritized studies published in the last ten years on the subject. However, studies considered important and used as reference in the most recent articles were searched for additional review material.

The following key words and their corresponding Portuguese words were used in the search: breastfeeding (aleitamento materno), breast milk (leite do peito), lactating (lactação); early infant feeding (alimentação na infância); complementary feeding (alimentação complementar), diabetes mellitus (diabetes mellitus), type 1 diabetes (diabetes tipo 1), and type 2 diabetes (diabetes tipo 2). Using the term ''breast-feeding'', 29,069 published studies were identified. However, by including the terms ''diabetes'', a total of 52 articles were retrieved. Of these, 21 were analyzed (nine for T1DM and 12 for T2DM). The remaining articles were discarded, as they did not specifically address the issue.

Breastfeeding and the manifestation of T1DM

Borch-Johnsen et al., in 1984, were the first to observe that breastfeeding appeared to have a protective effect against T1DM, preventing or delaying the onset of this disease. It is proposed that the presence of antimicrobials and antiinflammatory agents, as well as substances that promote the maturation of the immune system in human milk exert a protective effect against T1DM.23

In animals prone to diabetes, offering prolonged and exclusive breastfeeding protected them against autoimmune diabetes, whereas intake of solid foods completely abolished this protective effect. It was found that breastfeeding is correlated with high levels of T-cells and low levels of inflammatory cytokines such as interferon-I, interleukin4, and interleukin-10.24 Epidemiological studies in humans also indicate the existence of a similar association.25 -- 28 The results of these studies suggest that proper nutrition during the first months of life prevents the manifestation of the disease. However, these positive effects were not identified by some authors.13 , 29

It appears that early exposure to cow's milk increases the chance of acquiring T1DM when compared to exclusive breastfeeding up to at least four months after birth.30

A meta-analysis (17 case-control studies) evaluated the association between diet in childhood and the risk of developing T1DM. A weak effect was observed between never having been breastfed (OR: 1.13, 95% CI: 1.04 to 1.23), and a moderate effect for infant formulas (OR: 1.38, 95% CI:1.18 to 1.61) and use of cow's milk before 3 months of age (OR: 1.61, 95% CI: 1.31 to 1.98) and the risk of disease manifestation. It was also found that the effect for populations with low prevalence of breastfeeding was similar to those that had never been breastfed. It is noteworthy that these effects were not observed in populations with high rates of breastfeeding, as well as the lack of association between having been breastfed and never having received breast milk with T1DM in populations in which the prevalence of breastfeeding is low. Thus, in case-control studies, differences in the prevalence of diabetes and breastfeeding need to be assessed and considered in the design of each study.31

In a recent meta-analysis comprising 43 studies (two cohort and 41 case-control studies) and a total sample of 9,874 patients with T1DM, it was observed that exclusive breastfeeding for more than two weeks reduced by 15% the risk of disease and a small reduction was identified in response to breastfeeding (exclusive or non-exclusive) for more than 3 months. It is possible that this difference may have occurred because of the accuracy of the information provided by the mothers and obtained by recall, from early lactation compared to later stages. The difficulties recalling feeding practices in early life is considered an important bias factor that can affect study results.32

Current evidence of another meta-analysis (27 casecontrol studies and one cohort) showed seven studies that indicated that breastfeeding for a short period of time or its absence can be a major risk factor for T1DM. The results of five other studies also indicated that, compared with healthy children, the diabetics either had not been breastfed or had been for a short period of time. Additionally, five studies showed an increase in the risk for T1DM associated with early introduction of cow's milk and other human milk substitutes. However, in five other studies, there was a weak association or no association between the disease and the short period of breastfeeding or early introduction of cow's milk. One study showed an inverse association between breastfeeding and the risk of T1DM.33

It is noteworthy that in all mentioned meta-analyses, the authors state that the weak association sometimes found between breastfeeding and T1DM may reflect the presence of methodological problems related to the reliability of the data analyzed in the studies. The lack of information or details on breastfeeding duration, whether exclusive or not, use of infant formulas and cow's milk, as well as the age of introduction of complementary foods, are some of these previously reported problems.

In a study conducted in Campina Grande, Brazil, with 128 children and adolescents, it was observed that 84.4% of diabetic children had been exposed to cow's milk before four months of age, whereas in the control group, this percentage was 64.1%. In the multivariate analysis, a significant association was found between early exposure to cow's milk and diabetes (OR: 4.09, 95% CI: 1.19 to 14.04).30

Another study, involving 200 T1DM children (2-6 years) in Saudi Arabia, showed an association between T1DM and prolonged consumption of cow's milk (OR = 4.3), short duration of breastfeeding (OR = 3.5), and excessive consumption of cow's milk (OR = 2.4).34

It is believed that bovine serum albumin is one of the possible factors responsible for triggering the autoimmune process involved in the manifestation of T1DM. Antibodies to this protein were found in patients newly diagnosed with the disease. Important epidemiological evidence also indicates the existence of a strong correlation between the consumption of cow's milk and T1DM incidence in several countries.35 Thus, there is little doubt that the consumption of cow's milk is a trigger for the manifestation of diabetes.

Table 1 shows the summaries of studies that investigated the association between T1DM and duration of breastfeeding.

Table 1 Studies that investigated the association between type 1 diabetes mellitus and breastfeeding. 

Study Design Sample Age at Type and duration of Data collection Adjustment for Results
assessment breastfeeding method confounding factors
Collado-Mesa & Descriptive, Cuba ? Not assessed, one to Cases - No association
Díaz-Díaz12 retrospective N = 263 two months and three registered in
to 44 months national
(does not inform database
whether it was
exclusive)
Macedo et al.10 Case-control, Brazil The duration of Patients with - Inverse association
retrospective N = 124 (47 ? breastfeeding was previous verified for females.
diabetics and analyzed before diagnosis Mean time of
77 without the introduction of cow’s followed at exclusive
disease) milk outpatient breastfeeding in the
clinic study group = 2.1
months vs.
control = 3.7 months,
Breast milk: = five p = 0.0449.
Rosenbauer et al.28 Case-control, Germany 11-14 years Cases Additional Breastfeeding = 5
retrospective n = 760 months versus < two registered in consumption of cow’s weeks was a
cases/1,871 weeks national milk, family history of protective factor
controls database T1DM, socioeconomic against T1DM (OR:
status, maternal age, 0.71 (CI: 0.54-0.93)
Was not breastfed; = birth weight, parity
Viner et al.13 Longitudinal, England, 5, 10, and 30 Self-report of - No association
self-report Scotland, Wales years three months, and < participants at
and Northern three months 30 years of age
Ireland
n =11,261
Leal et al.11 Descriptive Brazil ? Was not breastfed, Patients with a - Association verified
study mother’s n = 33 T1DM was breastfed < 1 previous for early weaning
report month, or up to one, diagnosis (breastfeeding < six
two, three, four, five, followed as months) and presence
or six months. outpatients of diabetes (30.6% of
the sample were
breastfed for less
than one month and
only 12.1% reached
six months)

CI, confidence interval

OR, odds ratio

T1DM, type 1 diabetes mellitus

After analyzing the results of these studies, it appears that there is a controversy on the role of human milk in the development of T1DM.

Although the findings of the study by Leal et al.11 indicated the existence of a positive association between breastfeeding and T1DM, the study lacked a control group. Controls are essential to mitigate the possible effects exerted by confounding variables.

Another difficulty to consider breastfeeding causative of T1DM is associated with the date of onset of pancreatic [cell destruction, which starts at an early age in children with a genetic predisposition to the disease.36 Thus, this destruction can start many years before the disease diagnosis, and the associations observed in the studies may reflect the effects of other precipitating factors of disease, not necessarily of promoters of the autoimmune process.37

There is reason to believe that the development of chronic diseases of infectious or immunological etiology may be influenced by the type of feeding in the first year of life. Despite the controversies in the study results, the promotion of breastfeeding rather than the use of cow's milk should be encouraged in the first year of life.

Maternal breastfeeding and T2DM manifestation

The reported evidence on the effects of breastfeeding by the Agency for Healthcare Research and Quality highlights, among other benefits associated with breast milk, the protection against T1DM and T2DM,38 which has been reinforced by other authors.39

Children who receive breast milk have a lower risk of being overweight during childhood, adolescence,40 and adulthood.41 The World Health Organization conducted a meta-analysis that included 39 studies published in the past 40 years. The results of this study indicated that breastfed children were less likely to become obese (OR: 0.78, 95% CI:0.72 to 0.84), even after adjusting for parental nutritional status, socioeconomic status, and birth weight.15 Recently, the breastfeeding protection against overweight was also confirmed by other authors.42

Moreover, this practice was associated with a 10% to 20% decrease in the risk of cardiovascular events (coronary heart disease and stroke) in women participating in the Nurses' Health Study.43 Conversely, a study involving men showed no association between breastfeeding and risk factors or cardiovascular mortality.44 In this study, the authors once again attributed the lack of evidence to the mothers' memory biases, as the evaluation of breastfeeding was performed decades after birth.

In one study, a prevalence of 1.2% of T2DM was found in breastfed individuals, when compared to 3% in those who had not been breastfed, with no significant difference.45 According to the authors, this result was possibly due to the low prevalence of diabetes in the studied population.

In one cohort (n = 405) there was a decrease of 0.12% in glycated hemoglobin levels in non-diabetic adults that had been breastfed when compared to those that had been formula-fed. Although this reduction was small, the authors emphasized its importance in terms of public health. It was also observed that breastfeeding was inversely associated with the development of atherosclerosis.46

Breast milk results in greater satiety than infant formulas, preventing excessive weight gain during childhood. Therefore, this type of milk protects against the development of obesity and consequently, of T2DM.14 The protective effect of breastfeeding was also observed by other authors.13 , 20

However, this association has not been observed in some other studies.18 , 22 Nevertheless, according to Davis et al.,22 this fact might be due to the use of the retrospective method to investigate the history of breastfeeding.

Another limitation of that study was the small sample size, as the subjects were divided into breastfeeding duration categories, and there were only eight subjects in the six to 12 months range. These facts may have masked the association between breastfeeding and T2DM.

In the study by Fall et al.,18 the absence of evidence on the effect of breastfeeding duration on the manifestation of T2DM or adiposity was attributed to the lack of a single definition for exclusive breastfeeding among studies. It is also believed that the association between breastfeeding and T2DM may be affected by the ''dose response'' effect, that is, the more breast milk the child receives, the lower the risk of developing the disease. However, obtaining reliable information on the amount of breast milk intake and the intake of complementary foods may not occur, thus compromising the reliability of study results. It is important to know the genetic predisposition of the parents, to help separate genetic effects from those resulting from inadequate food supply to the child.45

Table 2 shows the summaries of studies that investigated the association between T2DM and duration of breastfeeding.

It is believed that the protection of breastfeeding against overweight and T2DM is associated with its biochemical constituents and their differentiated nutritional composition. Some bioactive substances can promote energy balance by reducing fat deposition and favoring desirable metabolic responses. Human milk contains docosahexaenoic acid (DHA). Further, breast milk contains adequate amounts of polyunsaturated fatty acids (PUFAs) to ensure an adequate number of insulin receptors in the child's brain, necessary to maintain normal glycemic metabolism.47

It can be observed that the phospholipid membranes of breastfed children have significantly higher amounts of DHA and other PUFAs than those not breastfed. It is believed that low concentrations of DHA and PUFAs can result in insulin resistance.14

High levels of basal and post-prandial insulin and neurotensin (which inhibits insulin secretion and stimulates glucagon secretion) have been reported in formula-fed infants compared with breastfed infants.48 Such differences may lead to the development of insulin resistance and T2DM.

It is noteworthy that most of the authors of the studies analyzed in this review did not report the duration of breastfeeding or provide information on complementary feeding (Table 2). Most of these studies were performed in developed countries, where mothers who follow the nutritional guidelines tend to have high levels of education and income. Analyses of data from countries of low-and middle-income can help identify the effects of confounding factors, since the association between infant feeding practices and socioeconomic class differs among them.18

Table 2 Studies that investigated the association between type 2 diabetes mellitus and breastfeeding. 

Study Design Sample Age at Type and time of Data collection Adjustment for confounding Results
assessment breastfeeding method factors
Young et al.16 Case-control Canada < 18 years Did not receive Retrospective Gestational diabetes, Children breastfed for = six months
n = 46 (cases) breast milk, < six report by mother alcohol consumption during were less likely to develop T2DM
n = 92 (two months, = six pregnancy, smoking during compared with those who received
controls for months pregnancy, birth weight, breast milk < six months (OR: 0.36,
each case) maternal nutritional status 95% CI: 0.13 to 0.99)
Owen et al.14 Systematic Seven studies 1-71 years The classifications The studies Three studies had Individuals who were breastfed were
review (maternal of exclusive defined T2DM in information about relevant less likely to have T2DM (OR: 0.61,
breastfeeding, breastfeeding different ways: confounding factors (birth CI: 0.44-0.85). ORs were similar
formula, and varied between oral glucose weight, family history of before and after adjustment
diabetes) studies and were tolerance test - diabetes, socioeconomic
n = 76,744 kept in the 75g, fasting status, individual and
(Australia, analyses as glucose, post-load maternal nutritional status)
Finland, previously or fasting glucose,
Sweden) classified data collection
from
questionnaires
Davis et al.22 Retrospective Latin 8-13 years Did not receive The study Gestational diabetes There was no significant effect of
for Americans breast milk, < six evaluated the risk mellitus, age, gender, and breastfeeding on the risk factors for
breastfeeding n = 240 months, = six of T2DM by body composition T2DM
and cohort for months and < 12 intravenous
nutritional months, = 12 glucose tolerance
status months test
Mayer-Davis Case-control USA Did not receive Retrospective Age, gender, current BMI, Individuals who were breastfed were
et al.19 retrospective breast milk, = six mother’s report ethnicity, birth weight, less likely to have T2DM compared to
n = 80 with months, and < six maternal diabetes, family those who were never breastfed (OR:
T2DM months history of diabetes, 0.26, 95% CI: 0.15 -0.46).
n = 167 maternal age, Associations remained after
(control) pre-gestational BMI, adjustment (OR: 0.4, 0.19 to 0.99);
maternal schooling, however, when BMI was added to the
smoking during pregnancy, model the association was attenuated
consumption of alcohol (OR: 0.82, CI: 0.30-2.30), suggesting
during pregnancy possible mediation through the
current weight of the child.
* The analyses that incorporated the
duration of breastfeeding, even after
adjustment, showed a dose response
effect (test of trend: p < 0.0001).
The results were similar among
races/ethnicities (Hispanic,
non-Hispanic white, non-Hispanic
black).
assessment breastfeeding method factors
Madsen Cross-sectional Denmark 9 months Did not receive The study Gender, breastfeeding up to Insulin levels were lower in the group
et al.20 with analysis of n = 265 breast milk, = two evaluated the risk 9 months, duration of breastfed until 9 months compared to
data from a times/day, or = of T2DM through fasting and energy non-breastfed (23.7 pmol/L versus
cohort three times/day the glycemia and contained in the meal 37.0 pmol/L, p < 0.042), with
Breastfeeding up insulin levels before fasting for the test, considerable low concentrations
to 9 months of age diet, skin folds, body when breastfed more times per day.
(yes or no) weight, height, and BMI at 9 Glucose levels did not differ
months
Fall et al.18 Analysis of data Brazil, 15-41 years Only one study Data collection on Analyses were adjusted for There was no association.
of five Guatemala had information breastfeeding was socioeconomic status,
prospective India, on exclusive retrospective in schooling, age, smoking,
cohorts Philippines, breastfeeding all studies ethnicity, housing in urban
and South or rural area, and birth
Africa weight
n = 10,912
Veena et al.21 Cohort India 5 and 9.5 < three months, Mother’s report The analyzes were adjusted Prolonged breastfeeding was
n = 518 years three to five for gender, age, current associated with low levels of insulin
months, six to BMI, income, parental level and HOMA-IR at 5 years, but not at
eight months, nine of schooling, urban or rural 9.5 years. The associations were
to 11 months, 12 residence, birth weight, independent from potential
to 17 months, = and gestational diabetes confounding factors.
18 months

BMI, body mass index

CI, confidence interval

DMT2, type 2 diabetes mellitus

HOMA-IR, homeostatic model assessment of insulin resistance

It is worth mentioning that, for ethical reasons, the vast majority of available studies involving human subjects on the benefits of alternative forms of feeding are observational, which does not prove the existence of a cause-and-effect association. In these studies, the small number of exclusively breastfed children assessed can also be an important limiting factor to obtain the statistical power necessary to detect beneficial effects.45

In low and middle-income countries, even though breastfeeding tends to be a common practice, many mothers introduce complementary foods and terminate breastfeeding early.49 Obesity, diabetes, and cardiovascular disease are increasing fast in these countries.50 Therefore, the promotion of healthy eating habits in childhood with exclusive breastfeeding maintained up to 6 months and as a complement until at least the age of 2 years is a low-cost strategy that can positively affect the child's health throughout life.

Final considerations

Although there is still no consensus in the scientific community, evidence available to date shows that lack of breastfeeding is a possible modifiable risk factor for the manifestation of both T1DM and T2DM. The benefits of breastfeeding have been attributed to bioactive substances, which promote the maturation of the immune system, reduce insulin resistance, and prevent excessive weight gain during childhood.

In order to answer existing questions on the actual effects of inappropriate feeding practices, well-designed longitudinal studies are needed, with clearer criteria for the selection of participants in these studies and adjustment for potential confounding factors, aiming to elucidate the possible mechanisms responsible for the protective impact of breastfeeding on DM manifestation. It is important that future studies identify the duration and exclusivity of breastfeeding in order to prevent such manifestation in individuals genetically predisposed to the disease.

Funding

Doctoral grant from CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) to Patrícia F. Pereira.

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Received: December 26, 2012; Accepted: February 26, 2013

* Corresponding author. E-mail: patricia.feliciano@ufv.br (P.F. Pereira).

Conflicts of interest The authors declare no conflicts of interest.

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