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Pediatric Endocrinology Diabetes and Metabolism
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Original paper

Association between food consumption and high levels of low density lipoprotein cholesterol among obese children

Marcela Maria Pandolfi
1
,
Jane de Eston Armond
2
,
Carolina Nunes França
2
,
Fabiana Salatino Fangueiro
2
,
Luiz Henrique da Silva Nali
2
,
Ana Paula Ribeiro
2
,
Patricia Colombo-Souza
2

  1. Medicine Graduation Course, Santo Amaro University, São Paulo, Brazil
  2. Post-graduation Program in Health Sciences, Santo Amaro University, São Paulo, Brazil
Pediatr Endocrinol Diabetes Metab 2022; 28 (1): 46–53
Online publish date: 2022/03/03
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Introduction

Today, the growth in overweight rates is one of the main public health issue. The increase in the prevalence of overweight and obesity in children is a pattern of the last decades. The number of children under five years old with overweight and obesity increased from 32 million in 1990 to 41 million in 2016, the majority of them reside in developing countries [1].

As a consequence of the overweight, metabolic disorders such as dyslipidemia with increased LDL-C (LDL cholesterol fraction) circulating levels of, which occurred mainly in adulthood, have appeared in childhood. Thus, the development of atherosclerosis and the process of cardiovascular disease begin early and quietly [2, 3].

Previous studies have assessed the cardiovascular risk associated with inadequate food consumption. Brazilian data show, for example, that only 35% of the population adopts the recommended consumption of fruits and vegetables [4], which are important for preventing obesity and its comorbidities. The intake of these foods in children is also well below the recommended values [5, 6].

In fact, the dietary pattern has undergone changes in recent decades worldwide, which is well characterized by an increase in the intake of foods with high energy density, low in fiber and high in saturated fat, trans fat and simple sugars. This nutritional transition associated with physical inactivity, smoking and alcoholism results in an alarming increase in overweight and obesity rates, including children, who have increasingly become hostages to social changes and greater access to industrialized foods and fast foods [7, 8].

The interest in the evaluation of food groups considered to limit feeding patterns or not has been growing in child nutrition research [9, 10]. Such knowledge can support or develop health strategies aimed at controlling and avoiding excess weight and, consequently, cardiovascular diseases.

Therefore, the aim of the study was to investigate the association of the characteristics of food consumption with the increase in serum LDL-C in obese children.

Material and methods

Population

This is a cross-sectional study of obese children from five to ten years. The children were recruited at the nutritional care clinic at the Complexo Hospitalar Wladimir Arruda (São Paulo – SP, Brazil). The inclusion criteria were: children with complete anamnesis and with a lipid profile measurement performed on the date closest to the first consultation with the nutritionist (maximum of 30 days). Children with suspected secondary causes of obesity (Cushing's syndrome or hypothyroidism), diseases with direct interference in the lipid profile (diabetes mellitus, chronic renal failure, nephrotic syndrome) and those using medication that potentially modify body composition or dosage of total cholesterol and fractions were not included in the study.

Nutritional condition assessment

Weight measurements were performed on a digital anthropometric scale (Filizola). The children were weighed on standing position, without shoes and wearing light clothing. Height measurements were performed using a 0.1 cm stadiometer. During the child’s measurement, the back was kept straight and the feet parallel with four points of contact with the plane (feet, buttocks, back and occipital region). The look was directed at the horizon line, respecting the Frankfort line.

The body mass index (BMI) expressed in kg/m2 was calculated for each child. A child with a BMI greater than or equal to the 95th percentile was considered obese according to age and sex, according to the curves and percentile tables of the body mass index of the Centers for Disease Control and Prevention (CDC) [11].

The interviews and measurements were carried out by a single trained observer after setting standards defined by a panel of child nutrition specialists.

Lipid profile evaluation

The Food Frequency Questionnaire - FFQ was applied to assess the relation of food intake and possible development of chronic diseases. To estimate the lipid profile, peripheral blood was collected and sent to and analyzed by the University of Santo Amaro Laboratory. The examination was carried out by the enzymatic method and with children fasting for 12 hours. Reference values were used according to the table below, following the I Guideline for the Prevention of Atherosclerosis in Childhood and Adolescence [12].

Statistical analysis

Hypercholesterolemia was considered by the presence of LDL-C fraction values above 130 mg/dl [13].

To analyze significance of the variables, consistency analyzes and univariate and bivariate descriptive statistics were performed. To quantify chance in associations, the χ2 test [14] was used.

The effect of the characteristics of food consumption on hypercholesterolemia was studied considering the difference between the consumption of risky foods and the consumption of protective foods. Protective foods were considered: fruits, vegetables and whole grains; and high-risk foods: whole milk products (cheese, curd); animal fats (lard, bacon, butter, crackling); vegetable fats (margarine); fried foods (potatoes, pastries, snacks); derived products (sausages, sausage, hamburger, meat-based preparations) and stuffed cookies. The Food Frequency Quantitative Questionnaire (QQFA) was used to assess food consumption. For each food item of the QQFA there are categories of frequency of consumption that characterize the absence of consumption “never” until “daily” and the number of times that food item was consumed on the day of consumption, which ranges from “one” to “six times/day”.

The sample was divided equally into 3 strata according to this difference (negative or minimal, moderate and high difference).

For the control of confounding variables, a multivariate model of logistic regression was adjusted with estimates of odds ratios [odds ratio (OR)] for risk factors between groups of children with and without hypercholesterolemia according to the serum levels of the LDL-C [15].

The criteria for choosing the variables for composing the final models was the level of significance with a p-value less than 0.20 in the bivariate analysis. In addition, control variables were those with a plausible effect on the children’s LDL-C level (gender, age, physical activity and difference between the consumption of risky and protective foods).

The maximum level of 0.05 was chosen to indicate a statistically significant association, this being the criterion used to remain in the final models. The statistical package used was Stata 12.0 [16].

Ethical aspects

Parents or guardians signed an informed consent form to authorize children’s participation in the project. The study was approved by the research ethics committee of Universidade Santo Amaro protocol#912009, following the requirements of the Declaration of Helsinki.

Results

A total of 137 children were enrolled in the study. The average age of the children was 8.27 years (95% CI: 8.0-8.56), The prevalence of hypercholesterolemia based on the serum level of the LDL-C fraction was 14.6% (95% CI: 8.6–20.6%).

We assessed the risk factors associated with hypercholesterolemia (cholesterol > 170 mg/dl) in the obese patients evaluated and the following variables were statistically significant, regardless of the measure of association used: “Street food”, “Eating in front to TV”, “Breakfast”, ”Family History” and “Breastfeeding”, with the prevalence ratio showing more conservative point estimates and more compact intervals in relation to the ratio of chances of cholesterol above the normal value for this group (Table I).

Table I

Prevalence, Odds Ratios with their respective confidence intervals (95% Cl) of risk factors for hypercholesterolemia (Cholesterol > 170 mg/dl) in obese children followed at an obesity clinic, São Paulo

Risk factorsnHypercholesterolemia PrevlenceOdds Ratios (Cl 95%)P*R\ R2Regression Coefficienttp**
ZIMC/I<313747.3(35/74)0.99 (0.48; 2.04)0.970.15; 0.010.11.70.078
> 347.3(30/63)1
GenderMale13744.7(34/76)0.78 (0.38; 1.63)0.4790.10; 0.010.110.317
Female50.8(31/61)1
Birth weight< 3.000 g13555.6(20/36)1.50 (0.65; 3.48)0.2990.02; 0.010.10.90.321
> 3.000 g45.4(45/99)1
Age (years)< 913745(27/60)0.84 (0.40; 1.74)0.6130.7; 0.010.10.70.475
>949.4(38/77)1
Mother with CompanionYes13746.3(44/95)0.86 (0.39; 1.90)0.6910.09; 0.0250.90.368
No50(21/42)1
Maternal age (years)<3513646(34/74)0.85 (0.41; 1.77)0.6370.04; 0.050.10.40.641
> 3550(31/62)1
Desired childrenYes13543.9(43/98)0.60 (0.26; 1.37)0.1810.10; 0.015.710.308
No56.8(21/37)1
Family hiper-cholesterolemia historyYes13743.4(36/83)0.66 (0.31; 1.39)0.2370.74; 0.550.413.80.001**
No57.7(29/54)1
Maternal education in years<413645(36/80)0.76 (0.36; 1.60)0.4360.10; 0.010.30.10.85
> 451.8(29/56)1
BreastfedYes13045.4(54/119)0.47 (0.10; 2.00)0.2460.26; 0.0623.32.60.009**
No63.6(7/11)1
Adequate lunchYes13646.5(40/86)0.87 (0.41; 1.85)0.6950.03; 0.011.70.30.745
No50(25/50)1
Adequate dinnerYes13743.3(35/79)0.74 (0.36; 1.55)0.390.07; 0.013.70.70.47
No51.7(30/58)1
Used bottle with sugarYes13048.5(33/68)1.14 (0.54; 2.42)0.7010.30; 0.101-0.20.776
No45.2(28/62)1
Used bottle with ThicknerYes13048.7(38/78)1.20 (0.56; 2.58)0.6160.02; 0.010.30.20.799
No44.2(23/52)1
Used bottleYes13046.7(49/105)0.95 (0.36; 2.51)0.9040.09; 0.02-5.7-0.80.386
No48(12/25)1
BreakfastYes13745.2(52/115)0.57 (0.20; 1.58)0.2320.75; 0.560.514.10.001**
No59.1(13/22)1
Have meals on the streetYes13756.6(56/99)4.05 (1.63; 10.72)0.0010.75; 0.561140.001**
No24.3(9/37)1
Eats at the schoolYes13645.9(39/85)0.82 (0.38; 1.73)0.5640.07; 0.013.80.70.468
No51(26/51)1
Attends to Lan housesYes13733.3(2/6)0.55 (0.05; 4.00)0.4910.03; 0.09-4.1-0.30.745
No47.7(62/130)1
Has a computerYes13748.9(23/47)1.10 (0.51; 2.36)0.8010.06; 0.01-3.3-0.60.535
No46.7(42/90)1
Has a videogameYes13748.2(27/56)1.05 (0.50; 2.20)0.8810.10; 0.01-5.1-0.90.33
No46.9(38/81)1
Eats while watching to TV dailyYes13753.8(49/91)2.19 (1.01; 4.90)0.0350.72; 0.520.1130.001**
No34.8(16/46)1
Physical activity outside of the schoolYes13739.1(18/46)0.60 (0.27; 1.31)0.1660.02; 0.011.40.20.802
No51.6(47/91)1
Physical activity in the schoolYes13549.6(58/117)1.97 (0.63; 6.80)0.1990.10; 0.08-8.7-10.303
No33.3(6/18)1

Regarding the analysis of risk factors associated with hypercholesterolemia (LDL > 130 mg/dl) in the obese patients evaluated, the following variables were statistically significant, regardless of the association measure used, “Street food”, “Having a video game” and “Breastfeeding”, with the prevalence ratio showing more conservative point estimates and more compact intervals in relation to the odds ratio of the LDL fraction above the normal value for this group (Table II).

Table II

Prevalence, Odds Ratios with their respective confidence intervals (95% Cl) of risk factors for hypercholesterolemia (Cholesterol > 170 mg/dl) in obese children followed at an obesity clinic, São Paulo

Risk factorsnHypercholesterolemia
Prevalence
Odds Ratios (Cl 95%)P*R\ R2Regression
Coefficient
tp**
ZIMC/I<313747.3(35/74)0.99 (0.48; 2.04)0.970.15; 0.010.11.70.754
> 347.3(30/63)1
GenderMale13744.7(34/76)0.78 (0.38; 1.63)0.4790.10; 0.010.110.787
Female50.8(31/61)1
Birth weight< 3.000 g13555.6(20/36)1.50 (0.65; 3.48)0.2990.02; 0.010.10.90.548
> 3.000 g45.4(45/99)1
Age (years)< 913745(27/60)0.84 (0.40; 1.74)0.6130.7; 0.010.10.70.145
49.4(38/77)1
Mother with CompanionYes13746.3(44/95)0.86 (0.39; 1.90)0.6910.09; 0.0250.90.073
No50(21/42)1
Maternal age (years)<3513646(34/74)0.85 (0.41; 1.77)0.6370.04; 0.050.10.40.512
> 3550(31/62)1
Desired childrenYes13543.9(43/98)0.60 (0.26; 1.37)0.1810.10; 0.015.710.118
No56.8(21/37)1
Family hipercholesterolemia historyYes13743.4(36/83)0.66 (0.31; 1.39)0.2370.74; 0.550.413.80.231
No57.7(29/54)1
Maternal education in years<413645(36/80)0.76 (0.36; 1.60)0.4360.10; 0.010.30.10.181
> 451.8(29/56)1
BreastfedYes13045.4(54/119)0.47 (0.10; 2.00)0.2460.26; 0.0623.32.60.026**
No63.6(7/11)1
Adequate lunchYes13646.5(40/86)0.87 (0.41; 1.85)0.6950.03; 0.011.70.30.219
No50(25/50)1
Adequate dinnerYes13743.3(35/79)0.74 (0.36; 1.55)0.390.07; 0.013.70.70.904
No51.7(30/58)1
Used bottle with sugarYes13048.5(33/68)1.14 (0.54; 2.42)0.7010.30; 0.101-0.20.306
No45.2(28/62)1
Used bottle with ThicknerYes13048.7(38/78)1.20 (0.56; 2.58)0.6160.02; 0.010.30.2
No44.2(23/52)1
Used bottleYes13046.7(49/105)0.95 (0.36; 2.51)0.9040.09; 0.02-5.7-0.80.868
No48(12/25)1
BreakfastYes13745.2(52/115)0.57 (0.20; 1.58)0.2320.75; 0.560.514.10.993
No59.1(13/22)1
Have meals on the streetYes13656.6(56/99)4.05 (1.63; 10.72)0.0010.75; 0.561140.001**
No24.3(9/37)1
Eats at the schoolYes13745.9(39/85)0.82 (0.38; 1.73)0.5640.07; 0.013.80.70.463
No51(26/51)1
Attends to Lan housesYes13733.3(2/6)0.55 (0.05; 4.00)0.4910.03; 0.09-4.1-0.3
No47.7(62/130)1
Has a computerYes13748.9(23/47)1.10 (0.51; 2.36)0.8010.06; 0.01-3.3-0.60.043**
No46.7(42/90)1
Has a videogameYes13748.2(27/56)1.05 (0.50; 2.20)0.8810.10; 0.01-5.1-0.90.631
No46.9(38/81)1
Eats while watching to TV dailyYes13753.8(49/91)2.19 (1.01; 4.90)0.0350.72; 0.520.1130.142
No34.8(16/46)1
Physical activity outside of the schoolYes13539.1(18/46)0.60 (0.27; 1.31)0.1660.02; 0.011.40.20.538
No51.6(47/91)1
Physical activity in the schoolYes13549.6(58/117)1.97 (0.63; 6.80)0.1990.10; 0.08-8.7-10.303
No33.3(6/18)1

Data of hypercholesterolemia based on the serum level of total cholesterol and LDL-C fraction, revealed that children from the group who consumed the smallest difference in risky and protective foods daily were less likely to have a high level of total cholesterol (p = 0.044). However, there was no statistically significant difference when using the LDL-C fraction level as a criteria for hypercholesterolemia (p = 0.218).

Discussion

The assessment of the population’s health and living conditions should take into account the children’s nutritional situation associated with basic needs such as sanitation, access to health services, wealth and education [17,18].

Studies in Latin America have shown that there has been an increase in the consumption of fats in recent years, specially from animal origin, in addition to the high participation of sugar in the diet. A similar pattern was found in Brazil, between the years 1961-1963 and 1999-2001 for fats (from 15.7% to 26.3% of total calories) and sugar (from 18% to 18.8% of total calories) [19].

It is known that school lunches are extremely important to fulfill the nutritional requirements of children in school. In this sense, the consumption of school meals (also considered as another lunch or another dinner, due to its components), may be associated with obesity [20]. In addition, in recent years, there has been a change in the pattern of food consumption among children and adolescents, where an increase in the consumption of snacks is observed, representing 25% of daily energy intake and contributing to the increase in childhood obesity [21, 22].

Most of the obese children studied (51.3%) attended to school from 7:00 am to 12:00 pm, 33.8% from 1:30 pm to 6:30 pm. These children probably had lunch or dinner twice, since the school offered a “lunch” at 9:40 am for the morning shift and a “dinner” at 3:20 pm for the afternoon shift. No studies were found relating obesity and school hours.

Also, 63% of obese children bought food on the street. Street food is what the child buys in establishments near the school, bakeries and pastry shops around the house. Of the 54 children who bought food on the street, 63.0% did so three times a week or more. The most consumed foods were: candies, lollipops and gum (81.5%), fried snacks (pastry and coxinha) (64.8%), packaged snacks (51.8%), hot dogs (22.2%) and stuffed wafer (13.0%). A study conducted by Pérez-Rodrigo et al., [23] evaluated the dietary pattern of Spanish children and adolescents, taking into account a healthy or not healthy standard of living. The authors found that both boys and girls belonging to the healthy group had a higher consumption of vegetables, fruits, fish, yogurt and water, when compared to the unhealthy group, although there were no differences in the prevalence of overweight and obesity between the two groups. Another study that aimed to understand the eating behavior of Spanish and Norwegian children, described distinct eating behaviors, which highlights the need for directed nutrition advices [27]. Indeed, eating behavior is a major issue in many regions as well as observed in Brazil [28, 29].

The years of potential life lost (YPLL) by this population, up to 70 years is 8704.81 days for diseases of the circulatory system and 1947.01 days for vascular diseases.

We described a high level of cholesterol in the children of this study, which is higher than normal. It is worth noting that this study was carried out with children who attended an educational group at an outpatient clinic located in a region of the municipality of São Paulo, where there is early morbidity/mortality from cardiovascular and/or vascular brain diseases [24].

The results presented here show the need for dietary guidance and encouragement to adopt a healthy lifestyle at an increasingly early age, highlighting the importance of childcare by the pediatrician, the care provided by the general practitioner integrated into the teams of the Family Health Support Centers (NASF) where nutritionists, physical educators, psychologists and pediatricians are present. The work of the interdisciplinary team is extremely important, with a view to reducing the frequency of obesity and its consequences such as cardio and vascular brain diseases, especially in this region where they affect the population early.

The school also plays an important role in guiding children’s food, monitoring canteens and the quality of food offered by them and the school itself [26]. Conscious food consumption at school promotes the adoption of healthy habits that will be discussed and taken to the family [26].

Concluding remarks

Many obese children of 5-10 years-old in Brazilian population present serum lipid profile classified as undesirable for age as well as food rich in components capable to exacerbate this lipid imbalance. They should be encouraged to intensify measures for early prevention of future cardiovascular disease.

Conflict of interests

none declared.

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