- Open Access
Food intake, physical activity and body composition of adolescents and young adults: data from Brazilian Study of Nutrition and Health
BMC Public Health volume 21, Article number: 1123 (2021)
Lifestyle acquired in youth can determine the individual’s health. Constant vigilances in all aspects related to the health of the young population is essential, and evaluate their health parameters is important. The objective of this study was to describe and to compare food intake, physical activity (PA) practice, nutritional status and body composition between adolescents and young adults.
Four hundred seventy-six individuals from the Brazilian Study of Nutrition and Health (EBANS) were analyzed. Food intake was evaluated by applying two 24-h Dietary Recall. The PA and sitting time (ST) were measured by the International Physical Activity Questionnaire in minutes/week and metabolic equivalent task (METs). Body weight and waist circumference (WC) were measured. Body mass index (BMI) and waist circumference to height ratio (WHtR) were calculated. Mann-Whitney and Chi-Square tests were used.
Energy and macronutrients intake, number of meals, and breakfast skippers weren’t different between age groups. 48% of adolescents and 53% of young adults didn’t meet the PA recommendation, and adolescents practiced more PA than young adults (total PA: p = 0.006; METs: p < 0.001; leisure PA: p = 0.001); the individuals who studied practiced more PA (total PA: p = 0.034; METs: p = 0.029; leisure PA: p < 0.001) and had ST significantly higher (p = 0.009) than those who worked. Almost 30% of adolescents and 45% of young adults had excess weight; presenting difference according to nutritional status, WC and WHtR (p < 0.001).
There is a high prevalence of excess weight among young Brazilians and differences were observed between age groups regarding nutritional status, body composition and PA practice.
ClinicalTrials.Gov NCT02226627. Retrospectively registered on August 27, 2014.
The transition period between childhood and adulthood is very dynamic and characterized by intense bio psychosocial changes [1,2,3], with different age cut-off points to define it. According to the World Health Organization (WHO), adolescents are individuals between 15 and 19 years  and youth comprise individuals between 15 and 24 years [3, 4]. However, WHO recognizes that the terms “adolescents,” “young adults,” and “youth” are used interchangeably . In the context of health aspects, this stage of life establishes some distinct age classifications, for example to assess nutritional status and adiposity [5,6,7,8], for the physical activity (PA) recommendation [9, 10], and to determine nutrient intake needs . Considering this group’s current social and lifestyle behaviors, added to peculiar and dynamic biological conditions, a more comprehensive age classification for adolescence has been discussed in the literature, classifying individuals aged 10–24 years .
Whatever the nomenclature used to define this stage of life, the lifestyle acquired in this period can determine the individual’s health and life condition, since the choices made can have an impact on future possibilities [3, 12, 13]. In this period, health risks are diverse and rapidly changing [13, 14], in addition to biological growth and development, which are still occurring intensively and are often neglected by health systems and society .
Over the years, individuals’ lifestyle and health are being impacted by several factors and/or different facets of transition to adulthood [3, 12]. In adolescence, important changes can occur in the dietary behavior of individuals . In Brazil, is observed an increase in the consumption of foods positively associated with the obesity, as well the replacement of traditional meals (such as rice and beans) by ultra-processed foods, even among adolescents, which may indicate a change in the Brazilian’s dietary behavior [15,16,17]. Also, the sedentary behavior is increasing among the adolescents around the world  what seems to be the consequence experienced by young people in the face of current socio-cultural changes, including the exaggerated appreciation of sedentary behavior, especially screen time (including electronic games, computer, tablet, smartphone)  that competes with active leisure time, culminating in a more inactive lifestyle .
The adoption of a healthy lifestyle, including a balanced diet and regular PA practice, should be encouraged from childhood, adolescence and throughout youth, since it affects immediately in health promotion and risk reduction that could impact the health of future generations [3, 13, 20, 21]. Several lifestyle factors are risk factors associated with cardiometabolic risk in the early stages of life . Constant vigilances in all aspects related to the health and well-being of the young population is essential, since this generation is being influenced by “unprecedented global forces” . In view of this fact, it is necessary to evaluate the health parameters of the young population that can be a consequence of habits and lifestyles acquired amidst the multiple behaviors inherent to this population. This study aims to describe food intake, PA practice, nutritional status and body composition of young Brazilians and to compare these parameters between adolescents (15–19.9 years) and young adults (20–24.9 years) of the Brazilian Study of Nutrition and Health (Estudo Brasileiro de Nutrição e Saúde, EBANS).
EBANS is a cross-sectional study and representative of the Brazilian population aged 15 to 65 years (n = 2000). It comprises all regions of the country, with sample calculation stratified by sex, age group and socioeconomic level (SEL). The Ethics Committee of the Federal University of São Paulo has approved this study, and all participants signed the Free and Informed Consent and/or the Consent Form . EBANS data were collected from October, 2014 to July, 2015. EBANS is the Brazilian appendix of the Latin American Study of Nutrition and Health (Estudio Latinoamericano de Nutrición y Salud, ELANS), a multicenter urban area study conducted in eight Latin American countries .
Within the sample universe of EBANS, the present study analyzed a subpopulation of 476 individuals aged 15–24.9 years. The characterization of the target population of this study is described in Fig. 1. Previously published , the sample selection methodology was systematic (to select urban conglomerates and households within each sampling unit) and random to select the sampling units defined based on the cartographic division of the census sectors . Exclusion criteria were individuals with diseases that could affect food intake and/or energy expenditure; with physical or mental disabilities; unable to read; pregnant or lactating women; absent from home or who refused to conduct the second interview; those who didn’t live in “homes” (such as hospitals and/or orphanages); and adolescents bellow 15 years old, once they are biologically vulnerable and would be necessary to check their stage of pubertal maturation (because it affect the nutritional status and body composition), what would be impractical from a logistic point of view to a population-based study as EBANS. For all data collection, the methodology was previously published [23, 24].
The socio-demographic characteristics, such as age, sex, region and educational level were self-reported by the participants. The educational level was categorized into basic education (up to high school) and higher education, which could be “complete or incomplete”, since 18-year-old individuals could already attend higher education, but have not completed this educational stage, which lasts an average of 4 years in Brazil. The SEL was determined according to the Standard Economic Classification Criteria Brazil , classified into three levels: high (grouping classes A1, A2, B1), medium (classes B2, C1) and low (classes C2, D, E).
Briefly, the food intake data was performed by the application of two 24-h Dietary Recall (24HR), in two home visits with an interval of 7 days; with the application of the Multiple Pass Method (MPM) . 24HR has been used as the preferred methodology in several population-based studies worldwide , since it ensures better adherence by the interviewee because it is quick and requires less memory time for the interviewees , being able to provide information about the food consumption of the previous day or the last 24 h and, when replicated in the same individual, can estimate the individual’s usual nutrient and/or energy intake, considering intrapersonal variability, using a statistical modeling technique, o Multiple Source Method (MSM) [30, 31]. The data were analyzed through the Nutrition Data System for Research software version 2013 (NDS-R University of Minnesota, MN, USA); and adjusted according to intrapersonal variability through the MSM [30, 31] to estimate the usual intake of each nutrient. Two variables related to dietary behavior (number of meals eaten and breakfast skippers) were analyzed, and the energy intake and the macronutrients intake (carbohydrates, proteins and lipids).
The PA and sitting time (ST) data was obtained by the application of the long-form International Physical Activity Questionnaire (IPAQ), having the last 7 days as reference. This questionnaire has been validated internationally using CSA accelerometer (model 7164) to assess total PA in individuals from 12 countries with Spearman’s correlation coefficients ranging from 0.46 to 0.96 . The PA sections of transportation and leisure were included due to the greater relevance of these practices to guide public health programs in Latin American urban environments . The transportation PA (walking and bicycle), and the leisure PA (walking and moderate-to-vigorous physical activities (MVPA)) were analyzed separately, according to the scoring protocol established by IPAQ (https://sites.google.com/site/theipaq/scoring-protocol). The intensity of 3.3 metabolic equivalent task (METs) for walking was attributed, 4.0 METs for moderate activity, and 8.0 METs for vigorous activity [34, 35]. Individuals who met the international PA recommendations [9, 10] were classified as “active”. ST included sedentary activities (time spent watching TV and DVDs, the use of other screens and reading), and it was determined by the equation: [ST (min/day) during weekdays × 5] + [weekend ST (min/day) × 2] / 7.
The following parameters were used to determine the body composition: body weight, the Body Mass Index (BMI), waist circumference (WC) measurement and the waist circumference to height ratio (WHtR). Data of body weight and height were measured with the aid of a Sanny® portable scale and portable stadiometer, respectively. The classification of anthropometric nutritional status was determined based on the BMI according to the parameters established by WHO for individuals > 19 years , and according to gender and age for adolescents ; and it reflects the “weight status”. WC was measured with Sanny® inelastic tape according to WHO recommendations , and categorized based on reference data for adolescents according to sex . WC > 88 cm for women and > 102 cm for men was used as a cut-off bridge for determining central obesity in young adults . The WHtR was also calculated, and was classified as inadequate when ≥0.54 for adolescents  and ≥ 0.5 for young adults .
Descriptive statistics was used for the categorical variables and, for the continuous, a 95% confidence interval, the measures of central tendency, and the 25th, 50th and 75th percentiles were calculated. Using the Willet, Howe and Kushi  method, the food intake data were adjusted by energy. The Kolmogorov-Smirnov test pointed out heterogeneous data distribution and the Mann-Whitney test was used to compare energy intake, macronutrients intake and PA level and ST, WC and WHtR (continuous variables) between the age groups. For the comparison of categorical variables (BMI, type of occupation, number of meals and breakfast skippers), the Chi-Square test was used. For all statistical tests, a 5% significance level was used. The statistical analyses were performed by Stata software (Statistics/Data Analysis, version 13.0, Texas, USA) and measured considering the sample weight .
The total number of participants included in this study was 476 (50.6% young adults); and the mean age of the adolescents was 17.06 years (±1.44), and young adults, 22.11 years (±1.43). In overall, about half of the population was from the Southeast region, male and classified as medium by SEL. Furthermore, around 70% of the adolescents had basic education while the same proportion of the young adults had higher education. Figure 1 illustrates the characterization of the population. Regarding type of occupation, the majority of adolescents were students (63.2%), 22.7% had work jobs, 10.7% were unemployed and 3.4% had household functions. Among young adults, more than half were working (57.6%), 21.6% were unemployed, 13.6% were students and 7.2% had household functions. A statistical difference between age groups was found (p < 0.001).
Regarding the dietary behavior, it was verified that the mean number of meals was four in both age groups: 4.13 (95%CI 3.98–4.29) among adolescents and 4.03 (95%CI 3.88–4.18) among young adults. Also, that the minority of adolescents (12.8%) and young adults (7.5%) omitted breakfast (did not have the meal in either 24HR), and more than half of the adolescents (66.8%) and young adults (68.5%) consumed breakfast habitually (reported in both 24HR). There were no statistical differences between both age groups (p = 0.131).
Energy and macronutrients intake were not different between both age groups (Table 1). The caloric distribution of macronutrients was 51.7 and 51.7% for carbohydrates, 17.1 and 17.5% for proteins, and 31.2 and 30.8% for lipids, for adolescents and young adults, respectively.
Significantly, adolescents practiced more total PA (METs-min/week and min/week) and leisure (min/week) than young adults. Overall, adolescents did 860 METs-min/week and 100 min/week more than young adults. For transportation PA, no statistical difference was found between both groups. In total, 48.1% of adolescents and 52.7% of young adults did not comply with the WHO recommendation for PA (p = 0.206). Regarding ST, there was no statistical difference between both groups (Table 2). PA data were also evaluated according to the type of occupation of individuals (considering only individuals who worked and studied). We found that those who worked practiced less PA than those who studied, significantly for total PA time (min/week), for total METs-min/week, and for leisure PA, except for transportation PA. The ST was significantly shorter among those who worked (Table 3).
Almost 30% of adolescents and 45% of young adults had excess weight (Fig. 2). There was a statistical difference between both groups in relation to the classification of the nutritional status and the continuous BMI value (p < 0.001). Regarding the WC measurement, the median found was 74.80 cm (95%CI 75.13–78.42) for adolescents and 80.00 cm (95%CI 80.27–83.78) for young adults; and the WHtR median was 0.44 (95%CI 0.45–0.47) for adolescents and 0.48 (95%CI 0.48–0.50) for young adults. A statistical difference between groups was found for both the WC and WHtR (p < 0.001). The adjustment values of the measurement of WC and WHtR are different between the age groups. It was found that 13.2% of adolescents and 32.4% of young adults had inadequate WC values. The WHtR was inadequate for 17% of adolescents and 39.4% of young adults.
The present study evaluated EBANS individuals aged 15 to 24.9 years, divided into two age groups, which were compared in relation to nutritional status, body composition, food intake and PA practice. In general, it was found that adolescents practiced more time of PA and had lower prevalence of excess weight when compared to young adults, with no significant differences to quantitative energy and macronutrients intake. It was also found that those who worked were those who practiced less time of PA compared to those who studied, which is related to the lifestyle of individuals.
The lifestyle and nutritional status of an individual in the early stages of life require vigilance, since they can determine the health condition that will be established in adulthood, since they are associated with cardiometabolic risk already in the childhood [22, 40]; and may add psychosocial consequences if weight variation (mainly excess weight) occurs during adolescence ; affecting the socioeconomic context of the environment. The transition phase to adulthood is marked by significant biological and socioeconomic changes, which can expand or limit the individual’s future possibilities, according to the choices made [3, 12], either in the social and/or biological context.
The global epidemic of obesity, added to the current global syndemic of obesity, undernutrition, and climate change , is associated with increased risk of chronic non-communicable diseases (NCDs)  is the result of a combination of several factors, including food consumption and PA practice which are modifiable risk factors [40, 43]. In the present study it was found that some parameters of body composition and nutritional status of age groups were statistically different, with a higher prevalence of inadequate WC, WHtR, and excess weight among young adults. Although the cross-sectional design of EBANS does not allow a cause and effect relationship or an analysis over time, this leads to reflection on possible changes in the lifestyle of young adults that could affect their nutritional status.
The eating habits acquired in the early stages of life can have repercussions on future habits. The stimulation of healthy habits from childhood is important, since once acquired at the beginning of life the record of first learning and social forms tend to remain throughout life [43, 44]. However, substantial changes and/or discontinuity of the dietary pattern during the adolescence phase can occur . In the present study, it was found that the habit of consuming breakfast was usual for most individuals; similar to data from the National Food Survey (Inquérito Nacional de Alimentação, INA) . The National School Health Survey (Pesquisa Nacional de Saúde do Escolar, PeNSE) revealed that the eating breakfast habit has increased 4.5% among Brazilian adolescent students from 2012 to 2015 .
Comparing the caloric intake data of the adolescents of the present study with the data from INA  and from Adolescent Cardiovascular Risk Study (Estudo dos Riscos Cardiovasculares em Adolescentes, ERICA) , it was possible to identify a similar quantitative intake; although there are some chronological and methodological differences between the above mentioned studies and EBANS. Regarding the caloric contribution of macronutrients to the total caloric values, the values found in EBANS for the adolescents were lower than those presented in the literature [47, 48] for carbohydrates (EBANS: 51.7%; ERICA: 54%; INA: 57%); slightly higher for proteins (EBANS: 17.1%; ERICA and INA: 16%); and similar to ERICA data for lipids (EBANS: 31.2%; ERICA: 31%; INA: 27.5%). According to DRIs , the caloric distribution of macronutrients was quantitatively adequate among adolescents in the present study and, for young adults, according to WHO , the caloric distribution reached the upper limit for lipids, was lower for carbohydrates and higher for proteins.
Regarding the sufficiency of PA practice, it was found that approximately half of adolescents and young adults did not meet the recommendations for PA practice [9, 10]; however, there was no statistical difference between individuals classified as active in both age groups, since the WHO recommends twice the time of PA to be practiced by individuals aged 5–17 years compared to those over 18 years old. According to data from the three editions of PeNSE [46, 51, 52] there was a higher prevalence of active adolescents in the present study. Comparing with data from the Surveillance of Risk Factors and Protection for Chronic Diseases by Telephone Survey (Vigilância de Fatores de Risco e Proteção para Doenças Crônicas por Inquérito Telefônico, VIGITEL) 2019 , which evaluated young people aged 18–24 years, a higher prevalence of young people who did not meet the PA practice recommendations was found in the present study.
The literature has reported that the PA practice in the early stages of life can increase the probability of individuals being active in the subsequent stages [20, 43]. The data from the present study showed that adolescents have been practicing more PA than young adults, both in METs-min/week and in total PA and leisure time; however, it should be noted that the EBANS design does not allow the population to be assessed and/or compared over time. Physical inactivity during leisure time is associated with increased adiposity in adults, assessed independently or in conjunction with lack of total PA . In the present study, excess weight and adiposity were more prevalent among young adults, together with a higher prevalence of physical inactivity during leisure time. The encouragement of PA practices during leisure time should be the focus of public policies, with reorganization of urban spaces to adapt public spaces where leisure and recreation activities could be performed .
The type of occupation was determinant for the PA practice, that is, those who have been working practiced less total PA and leisure. It was found that the median PA leisure time of young adults was 0 min/week; as well as the median PA leisure time of the individuals who worked (0 min/week). Behavior that can be associated with lifestyle, since assuming an economically active role in society, linked with social transitions, acquisition of responsibilities, and affirmation of individual identity, can impair habits and behaviors . Entering into the labor market, one of these social transitions assumed by young people, may affect behavioral and lifestyle aspects. Young adults represent an economically important group for society; since they are considered the healthiest stratum of any population . Their nutritional status can also affect cognitive and executive functions, impairing the developed work activities , as well as even influencing even remuneration .
PA practice during transportation is an opportunity to increase the PA practice of those who have been working. In the present study, it was found that transportation PA was not statistically different among age groups nor according to the type of occupation. Active transportation should be encouraged with public policies that facilitate urban mobility and allow the transportation of the population through non-motorized means of transport, such as bicycles, which requires safe and wide bike lanes .
Sedentary behavior is related to the individuals’ lifestyle. Although there are no parameters that define a sedentary behavior based on ST, and no official public health guidelines on the ST limit that can impair health, because there is no sufficiently consistent scientific data basis for this , studies have reported that frequent interruptions in ST can positively impact some cardiovascular parameters . In the present study, it was found that the ST was significantly shorter among those who worked. This finding may be associated with the profile of the activity developed by those who start in the labor market, since the search for the first job is marked by insertion difficulties. This is more prominent for the most qualified functions , which can be the activities performed by those who enter the labor market, less sedentary activities with more dynamic and multiple functions.
In view of the above, the data lead to the reflection that a new behavior seems to be assumed by young adults, mainly in relation to the PA practice, which was significantly lower among young adults. This fact could be a consequence of the adaptation to the new social roles assumed by young people entering the labor market, impacting their habits as well as lifestyle and reducing the PA practice, since the individuals who have been working were the ones who practiced less PA.
The main limitations of this study refer to possible overestimations and/or underestimations of the data reported by the interviewees through the questionnaires; however, the main strength of EBANS is the data collection methodology, with the additional techniques to minimize possible errors and biases , added to the rigorous training of the professionals who collected the data. The use of the same methodology, scientifically validated, in all regions of Brazil, including the population of adolescents and young adults, is another strength of the present study. It is important to note that EBANS was conducted in urban area, and the generalization of results for the rural area of the country should be cautious.
In view of the findings of this study, with some parameters analyzed that differed between age groups (such as PA and body composition variables), some statistical analyzes were conducted to assess possible correlations and/or associations; however, such analyzes were not statistically significant.
In conclusion, the findings of the present study show a high prevalence of excess weight among young Brazilians, being significantly higher among young adults. The energy and macronutrients intake was similar between age groups. The time of PA practice was significantly longer among adolescents; however, the percentage of those who did not meet the PA recommendations wasn’t different between age groups. The differences in health parameters between adolescents and young adults should be considered in the elaboration of specific actions related to improving the health and quality of life of the young population. It’s important to emphasize that the age group from 15 to 24.9 years is too broad and heterogeneous. It presents important differences in the multiplicity of behaviors assumed by young people as a result of the non-uniformity of the process chosen for the responsibilities acquisition.
Such findings can be a consequence of a new social behavior assumed by young people and, in this context, consequences are observed in the health parameters of individuals. Therefore, further studies are necessary to properly investigate such behaviors and their association with health parameters. Adolescents and young people are often noticed only as a group in transit, which is detrimental to being perceived and truly considered as individuals who have rights and duties in all society settings .
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Body Mass Index
Brazilian Study of Nutrition and Health
Latin American Study of Nutrition and Health
Adolescent Cardiovascular Risk Study
National Food Survey
International Physical Activity Questionnaire
Metabolic Equivalent Task
Multiple Pass Method
Multiple Source Method
Moderate-to-Vigorous Physical Activity
Chronic Non-Communicable Diseases
National School Health Survey
Surveillance of Risk Factors and Protection for Chronic Diseases by Telephone Survey
World Health Organization
Waist Circumference to Height Ratio
24-h Dietary Recall
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The authors thank all participants in the project and members of ELANS and EBANS team.
The ELANS field work was originally supported by a scientific grant from the Coca Cola Company (Atlanta, GA, USA) and by grants and/or support from the ILSI Argentina, Instituto Pensi/Hospital Infantil Sabara, Universidad de Costa Rica, Pontificia Universidad Católica de Chile, Pontificia Universidad Javeriana de Colombia, Universidad Central de Venezuela/Fundación Bengoa, Universidad San Francisco de Quito, and Instituto de Investigación Nutricional de Perú. The unrestricted grant from Coca Cola Company supported the design, data collection, field work and initial data analysis. Latin American ILSI branches (Argentina, Brazil, Mesoamerica, South Andean and North Andean) gave their support contributing with the fees for the open access journals. The funders had no role in the design of the study, in the collection, analyses, or interpretation of data, in the writing, any of the manuscripts, and in the decision to publish the results. The main researchers of ELANS and EBANS are the only ones responsible for the scientific information that is published.
Ethics approval and consent to participate
In accordance with Declaration of Helsinki, the study was approved by the Ethics Committee of the Federal University of São Paulo, SP, Brazil (#53532516.8.0000.5505) and Ethics Committee of the José Luiz Egydio Setúbal Institution – PENSI Institute (# 31670314.8.0000.5567). All participants signed the Free and Informed Consent and/or the Consent Term.
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Del’Arco, A.P.W.T., Previdelli, A.N., Ferrari, G. et al. Food intake, physical activity and body composition of adolescents and young adults: data from Brazilian Study of Nutrition and Health. BMC Public Health 21, 1123 (2021). https://doi.org/10.1186/s12889-021-11171-3
- Public health
- Physical activity
- Food intake