Evolution Of Nutritional Status Research Articles

Evolution of Nutritional Status in Patients on Hemodialysis after 1 Year of Intervention by a Team of Kidney Dietitian-Nutritionists: Is It Possible to Correct Malnutrition from More Severe Stages?

Evolution of Nutritional Status in Patients on Hemodialysis after 1 Year of Intervention by a Team of Kidney Dietitian-Nutritionists: Is It Possible to Correct Malnutrition from More Severe Stages?

Evolution of nutritional status and associated factors among formula-fed infants with cow’s milk protein allergy in a government program

BackgroundCow’s milk protein allergy (CMPA) is a common allergy in infants and can affect proper growth and development. This study verified factors associated with the evolution of the nutritional status (NS) among infants with CMPA fed with hypoallergenic formulas (HF).MethodsThis is a longitudinal study of infants (n = 1036) participating on a governmental program in Brazil. Researchers assessed Nutritional status before HF treatment (T1) and after HF treatment (T2). The causality of exposure variables on the evolution of NS was verified by Multinomial Logistic Regression (MLR).ResultsWe observed an increase in anthropometric indexes analyzed with statistically significant results (p < 0.01). The weight/age and height/age scores showed a significant reduction in infants with nutritional deficit. The Body Mass Index (BMI) showed a decrease in the number of infants with nutritional deficit (< -2 z-score). On the other hand, there was an increase in those classified as at risk of overweight, overweight and obese. MLR showed that those who remained < 12 months in the program had a lower odds ratio (95% CI = 0.355–0.906; p = 0.018) to have inadequate NS with increasing BMI. Preterm infants were 4 times more likely (CI 95% = 1.520–10.694; p = 0.005) to have their BMI decreased and those who received nutritional counseling had a lower odds ratio (CI 95% = 0.411–0.953; p = 0.029) to maintain adequate NS.ConclusionThe program has a significant impact on the NS of infants with CMPA. The constant management and implementation of differentiated criteria according to the evolution of NS for the supply of HF is fundamental in the continuity of this public policy.

221 COVID-19: Evolution of nutritional status in children with cystic fibrosis at the Federico Gomez Children's Hospital in Mexico

221 COVID-19: Evolution of nutritional status in children with cystic fibrosis at the Federico Gomez Children's Hospital in Mexico

The hypertriglyceridemic-waist phenotype as a valuable and integrative mirror of metabolic syndrome traits

Rates of non-communicable diseases (NCDs), such as obesity, diabetes, cardiovascular events and cancer, continue to rise worldwide, which require objective instruments for preventive and management actions. Diverse anthropometric and biochemical markers have been used to qualitatively evaluate degrees of disease, metabolic traits and evolution of nutritional status. The aim of this study was to integrate and assess the interactions between an anthropometric measurement, such as waist circumference (WC), and biochemical data, such as the triglyceride glucose index (TyG), in order to individually characterize metabolic syndrome (MetS) features considering the hypertriglyceridemic waist phenotype as a marker. An ancillary cross-sectional study was conducted using anthropometric measurements, such as weight, height, waist and hip circumferences, as well as fasting biochemical data of 314 participants. Different indices based on WC (WC, WC*TG and WC*TyG) were estimated to compute MetS components and accompanying comorbidities. ROC curves were fitted to define the strength of the analyses and the validity of the relationships. Associations were confirmed between anthropometric, biochemical and combined indices with some chronic disease manifestations, including hyperglycemia, hypertension and dyslipidemia. Both WC*TG and WC*TyG indices showed similar performance in diagnosing MetS (area under the ROC curve = 0.81). Interestingly, when participants were categorized according to a reference value of the WC*TyG index (842.7 cm*mg/dl), our results evidenced that subjects classified over this limit presented statistically higher prevalence of MetS and accompanying individual components with clinical relevance for interventions. These results revealed that WC*TyG mirrors the hypertriglyceridemic phenotype, which suggests may serve as a good indicator to define the metabolic syndrome phenotype and a suitable, sensitive, and simple proxy to complement others. A reference point was proposed with a good clinical performance and maximized sensitivity and specificity values.

Evolution of Nutritional Status after Early Nutritional Management in COVID-19 Hospitalized Patients.

Background & Aims: SARS-CoV2 infection is associated with an increased risk of malnutrition. Although there are numerous screening and nutritional management protocols for malnutrition, only few studies have reported nutritional evolution after COVID-19. The objectives of this study were to describe the evolution of nutritional parameters between admission and 30 days after hospital discharge, and to determine predictive factors of poor nutritional outcome after recovery in adult COVID-19 patients. Methods: In this observational longitudinal study, we report findings after discharge in 91 out of 114 patients initially admitted for COVID-19 who received early nutritional management. Nutritional status was defined using GLIM criteria and compared between admission and day 30 after discharge. Baseline predictors of nutritional status at day 30 were assessed using logistic regression. Results: Thirty days after discharge, 28.6% of patients hospitalized for COVID-19 were malnourished, compared to 42.3% at admission. Half of malnourished patients (53%) at admission recovered a normal nutritional status after discharge. Weight trajectories were heterogeneous and differed if patients had been transferred to an intensive care unit (ICU) during hospitalization (p = 0.025). High oxygen requirement during hospitalization (invasive ventilation p = 0.016 (OR 8.3 [1.6–61.2]) and/or oxygen therapy over 5 L/min p = 0.021 (OR 3.2 [1.2–8.9]) were strong predictors of malnutrition one month after discharge. Conclusions: With early nutritional management, most patients hospitalized for COVID-19 improved nutritional parameters after discharge. These findings emphasize the importance of nutritional care in COVID-19 patients hospitalized in medicine departments, especially in those transferred from ICU.

Evolution of nutritional status and survival in patients with cancer on tyrosine kinase inhibitors treatment

Background and objectiveTreatment with oral antineoplastic agents known as tyrosine kinase inhibitors (TKIs) is new and, thus, little is known about their impact on nutritional status (NS), dietary intake, quality of life, and survival. The aim of this study was to provide information on these components in order to guide future nutritional recommendations. Patients and methodA prospective, observational study in adults who start treatment with TKIs, in whom NS was assessed using the Patient-Generated Subjective Global Assessment (PG-SGA), anthropometric measures, biochemical parameters, and dietary intake (24-h dietary recall). The EORTC QLQ-30 was used to assess quality of life. Nonparametric tests were used in statistical analysis, and survival was analyzed using Kaplan–Meier and log-rank curves. ResultsOf the overall sample, 21.7% had moderate malnutrition according to PG-SGA, and 74.2% moderate weight loss at 6 months, but no patient had BMI<18.5kg/m2. Patients with moderate malnutrition had lower survival at four years of diagnosis (log-rank=0.015).Energy intake was lower than recommended by the ESPEN 2017 congress, and no patient covered the protein requirements (1.5g protein/kg weight) during follow-up.A worse score on the global health scale of the EORTC QLQ-C30 was related to worse NS. ConclusionsTreatment with TKIs does not appear to have a significant impact on NS and quality of life after 6 months of follow-up. Malnutrition should be prevented through individualized nutritional advice because it is related to shorter survival.

Assessment of Malnutrition Risk in Canadian Pediatric Hospitals: A Multicenter Prospective Cohort Study

To assess the prevalence, causes, and consequences of malnutrition, as well as the evolution of nutritional status, in Canadian pediatric health care institutions. In this multicenter prospective cohort study, a total of 371 patients were recruited from pediatric hospitals in 5 Canadian provinces. Subjects were aged 1 month to 18 years; admitted to a medical, surgical, or oncology ward; and had a planned hospital stay of >48 hours. Data on demographics, medical condition, anthropometric measures, and dietary intake were collected. The Screening Tool Risk on Nutritional Status and Growth (STRONGkids) and Subjective Global Nutritional Assessment (SGNA) were applied at admission. Malnutrition was defined as a weight-for-age, height-for-age, body mass index-for-age, or weight-for-length/height zscore <-2 SD. Among 307 subjects (median age, 5.3 years; median length of stay, 5 days), 19.5% were malnourished on admission. Both STRONGkids and SGNA classifications were associated with baseline nutritional status. Mean weight-for-age zscore was lower at discharge compared with admission (-0.14 vs -0.09; P < .01), and nearly one-half of all patients lost weight during their hospital stay. Only one-half of the children who were malnourished or screened as high risk of malnutrition were visited by a dietitian during their stay. The percentage of patients who lost weight during hospitalization was significantly greater in the group not visited by a dietitian (76.5 vs 23.5%; P < .01). Nutritional status deterioration and malnutrition are common in hospitalized Canadian children. Screening tools, anthropometric measurements, and dietitian consultation should be used to establish adequate nutritional support.

Protein-energy adequacy and nutritional evolution of preterm infants in neonatal intensive care unit

ABSTRACT Objective To evaluate the prescription of protein-calorie nutrition and its adequacy to the requirements of preterm newborns. Methods Prospective study with 30 preterm infants from a neonate intensive unit care. Anthropometric and nutritional therapy data were collected daily. Nutritional demands were defined according to the national guidelines. Protein-calorie nutritional support was considered adequate when it reached 70% of the calculated demand. The evolution of nutritional status was evaluated according to the growth curves of preterm infants. Statistical analyses were performed with the Statistical Package for Social Sciences 20.0, at a 5% significance level. Results The means of demand, prescription and infusion significantly differed from each other. The values of calories and proteins prescribed and infused were inadequate according to the calculated ones. There was no significant difference between the volume of prescribed and administered nutrition (p&gt;0.05). At birth, 30% of the children were small, 66.7% were adequate, and 3.3% were large for gestational age. At discharge, the percentages were 33.3%; 63.3%; 3.3%, respectively. The values at birth significantly differed from those at discharge (p&lt;0.01). Conclusion In the Unit of Neonatal Care studied, inadequate nutrient prescription and support is a factor that can compromise the nutritional status of the newborns at hospital discharge.

SUN-P091: Evolution of Nutritional Status in Locally Advanced Head and Neck (LAHNC) Patients Treated with Bioradiotherapy (BRT)

SUN-P091: Evolution of Nutritional Status in Locally Advanced Head and Neck (LAHNC) Patients Treated with Bioradiotherapy (BRT)

Nutritional risk, malnutrition and nutritional support among hospitalized patients in orthopedics/spinal surgery of a Hohhot teaching hospital.

The evolution of nutritional status (the prevalence of nutritional risk, malnutrition, overweight and obesity) and the nutritional support of the hospitalized patients from admission to discharge or over a two-week period in orthopedics/ spinal surgery of a teaching hospital in Hohhot were investigated. 432 patients from two wards of the orthopedics/spinal surgery from Jan to Dec 2013, the traditional spinal surgery and the minimally invasive spinal surgery, were selected and detected in this study. The Nutritional Risk Score 2002 (NRS 2002) was used to determine the patients' nutritional status within 48 h after admission and during their hospitalization. The overall prevalence of nutritional risk, malnutrition, overweight and obesity at admission was 11.6%, 12.7%, 35.9% and 7.41%, respectively. Overall, there were 88.0% of the patients who were at nutritional risk received nutritional support, while 14.1% of non-risk patients received a redundant nutritional support. The overall prevalence of nutritional risk changed from 11.6% at admission to 19.4% upon discharge (p<0.05), and the prevalence of malnutrition changed from 12.7% to 20.6% (p<0.05). The prevalence of overweight and obesity, which changed from 35.9% to 31.0% and from 7.41% to 5.79% respectively, didn't experience statistically significant evolution. NRS 2002 was a feasible nutritional risk screening tool for patients in spinal surgery of orthopedics department. Patients' prevalence of nutritional risk and malnutrition increased significantly in spinal surgery of this hospital. Some inappropriate uses of nutritional support were observed in orthopedics/spinal surgery, and nutritional support guidelines or protocols should be promoted by a professional committee.

Tolerability Study of a Free Amino Acid-based Formula in Children with Cow's Milk Allergy

Background: The prevalence of food allergy has increased worldwide. Cow’s milk allergy is a very common type of allergy in childhood. In non-breast-fed infants, with extremely severe or life-threatening symptoms, an amino acidbased formula may be considered the first choice for the dietary treatment. This study aimed to assess the tolerance to a new Brazilian amino acid-based formula and the nutritional status in children affected by cow’s milk allergy fed with this formula. Objective: To assess the tolerance to an amino acid-based formula and its nutritional status impact on children affected by cow’s milk allergy. Method: This is a clinical study conducted with a sample of 15 children, less than 5 years old with a clinical cow’s milk allergy diagnosis. The children were followed-up, in a Pediatric Outpatient Clinic. Anthropometric, clinical, epidemiological data were collected at the baseline and it was also prescribed the amino acid-based formula. Throughout the treatment, which lasted five months, the clinical response was assessed based on the remission of symptoms initially presented and the evolution of nutritional status, using the WHO child growth standards charts. Results: The sample included predominantly boys with a mean age of 28.1 months and 66.7% IgE-mediated. The average age of onset of the allergic symptoms was 2.15 ± 2.33 months. Symptoms were reported in different systems (cutaneous, gastrointestinal and respiratory). In every child, there was complete remission of allergy symptoms initially presented and proper evolution of nutritional status. Conclusion: This new free amino acid-based formula can safely be used for the dietary treatment for children with cow’s milk allergy. The subjects studied showed adequate children’s nutritional status evolution.

219 Nutritional intervention in paediatric cystic fibrosis patients leads to improvement of nutritional status – Preliminary results of a prospective study

Objective To assess the evolution of nutritional status and dietary intake in a group of patients with cystic fibrosis (CF) after implementation of a systematic nutritional approach. Methods Prospective study with 39 patients followed in a CF center in Lisbon. All data were collected in two different timepoints: T 0 (2012) and T2 (2014). We recorded demographic and clinical data: sex, age, genotype, pancreatic and pulmonary function; anthropometric parameters: weight, height and body mass index (BMI); dietary intake was assessed by 24 h recall. Statistical analysis: IBM®SPSS®22. Results Thirty-nine patients were included; 53.8% were male; age 10.0±4.5 y in T0 and 11.0±4.5 y in T2. The most common genotype was DF508 homozygotic (76.9%); 92.3% had pancreatic insufficiency. FEV1 decreased from 88.9±22.9% (T0) to 85.9±24.5% (T2). According to BMI, 23.1% (T0) and 20.5% (T2) had underweight, 61.5% (T0) and 69.2% (T2) were eutrophic and 15.4% (T0) and 10.3% (T2) had excess weight. A positive correlation between FEV1 and z-score of BMI was found in both evaluation moments (T0: r=0.530, p=0.002; T2: r=0.463, p=0.007). Regarding dietary intake, patients consumed 1987 kcal in T0 and 2436 kcal in T2 and 19% protein, 47.4% carbohydrates and 31.9% fats in T0 and 17.8% protein, 43.9% carbohydrates and 32.1% fats in T2. Percentage of patients with nutritional supplementation decreased from 51.3% in T 0 to 35.9% in T 2 . The nutritional status of our sample had a significant improvement due to a structured nutritional approach, since there was a decrease in the prevalence of under and over nutrition. Additionally we observed a decrease of the prescription of nutritional supplements without impact on the nutritional status and dietary intake.

PP115-MON: Case Report: Evolution of Nutritional Status in Pregnant HIV Positive Hemodialysis Patient, Coinfected with Hepatitis B and C

PP115-MON: Case Report: Evolution of Nutritional Status in Pregnant HIV Positive Hemodialysis Patient, Coinfected with Hepatitis B and C

Glycemic control and lipid profile of children and adolescents undergoing two different dietetic treatments for type 1 diabetes mellitus.

To compare the glycemic control and lipid profile of children and adolescents undergoing two different dietetic treatments for type 1 Diabetes Mellitus assisted at the Children and Adolescent's Diabetes Mellitus Health Center-UFRJ. A retrospective longitudinal study conducted between 2002 and 2006. We evaluated the same subjects in two different periods: after 1 year in TD and subsequently after 1 year in CCHO. The evolution of the nutritional status during the dietary treatments was evaluated using Body Mass Index (BMI) for age. The lipid panel was evaluated according to the 1st Guideline for Prevention of Atherosclerosis in Childhood and Adolescence, used in Brazil, and the glycemic control was evaluated by measuring glycated hemoglobin (HbA1c). We evaluated 93 individuals, 38.7% children and 61.3% adolescents. The mean age at study entry was 11.1 (± 2.66) years and the mean disease duration was 6.1 (± 3.2) years. A significant difference in the percentage of adequacy of HbA1c (p = 0.000) and in the values of total plasma cholesterol (p = 0.043) was found after 1 year of CCHO diet, which did not happen during the observation time of TD. The evolution of anthropometric nutritional status showed no significant difference between the beginning and the end of both dietary treatments. The results of this study suggest that a more flexible food orientation program can contribute to the improvement of blood glucose levels without causing deterioration of the lipid profile when compared to TD.

Relato de caso: a importância da atuação multiprofissional na laringectomia supracricóide

Esse estudo tem como tema a atuação multiprofissional na laringectomia supracricóide. A terapia fonoaudiológica no hospital foi realizada duas vezes por dia, após 14 sessões, a consistência pastosa foi liberada. O paciente retornou ao ambulatório de disfagia do hospital, uma vez por semana durante dois meses e atualmente retorna uma vez ao mês. A terapia nutricional por sonda nasoentérica (SNE) possibilitou a ingestão calórica necessária e hidratação e, com a liberação da consistência via oral pelo Fonoaudiólogo, o Nutricionista ampliou as opções de alimentos que o paciente poderia ingerir, favorecendo o ganho de peso e retirada da via alternativa de alimentação. A intervenção multiprofissional possibilitou que o grau de disfagia orofaríngea mecânica evoluísse de grave para disfagia orofaríngea leve apenas para líquidos, sendo a evolução da terapia constatada por meio da ingestão oral do paciente, a qual evoluiu da FOIS 1 para FOIS 3 e atualmente encontra-se na FOIS 6. A realização da terapia nutricional enteral possibilitou que o paciente recuperasse o seu peso usual, no período de três meses, haja vista que com a cirurgia, o mesmo perdeu 11 Kg. Verificou-se que por meio do acompanhamento multiprofissional, foi possível evoluir de uma nutrição enteral exclusiva para dieta por via oral, o que favoreceu a evolução do estado nutricional, com a recuperação do peso corpóreo, além de proporcionar melhora na qualidade de vida deste sujeito.

Clinical outcome of protein-energy malnourished patients in a Brazilian university hospital

Protein-energy malnutrition (PEM) is a treatable disease with high prevalence among hospitalized patients. It can cause significant increases in the duration of hospitalization and costs. PEM is especially important for health systems since malnourished patients present higher morbidity and mortality. The objective of the present study was to assess the evolution of nutritional status (NS) and the effect of malnutrition on clinical outcome of patients at a public university hospital of high complexity in Brazil. Patients hospitalized in internal medicine (n = 54), oncology (n = 43), and infectious diseases (n = 12) wards were included. NS was evaluated using subjective global assessment up to 48 h after admission, and thereafter at intervals of 4-6 days. On admission, patients (n = 109) were classified as well-nourished (n = 73), moderately malnourished or at risk of malnutrition (n = 28), and severely malnourished (n = 8). During hospitalization, malnutrition developed or worsened in 11 patients. Malnutrition was included in the clinical diagnosis of only 5/36 records (13.9% of the cases, P = 0.000). Nutritional therapy was administered to only 22/36 of the malnourished patients; however, unexpectedly, 6/73 well-nourished patients also received commercial enteral diets. Complications were diagnosed in 28/36 malnourished and 9/73 well-nourished patients (P = 0.000). Death occurred in 12/36 malnourished and 3/73 well-nourished patients (P = 0.001). A total of 24/36 malnourished patients were discharged regardless of NS. In summary, malnutrition remains a real problem, often unrecognized, unappreciated, and only sporadically treated, even though its effects can be detrimental to the clinical course and prognosis of patients. The amount of public and private funds unnecessarily dispersed because of hospital malnutrition is significant.

Comparison of nutritional parameters after abo incompatible living donor renal transplantation

The prevalence of malnutrition is high in patients on maintenance dialysis treatment in relation to low protein and energy intakes, metabolic disorders. We investigated the evolution of nutritional status during the first year after ABO incompatible living donor kidney transplantation (ABOI-LKT) in our hospital through assessment of chemical markers. A total of 16 kidney transplant recipients were followed during the first post-transplant year. Biochemical nutritional markers were assessed at 12 months later after ABOI-LKT. Differences in the means between the pre-transplant and post-transplant chemical markers were evaluated by paired Student’s t-test. Pre-transplant Post-transplant p value Body weight (kg) 57.74 ± 8.00 54.43 ± 7.62 0.00 S. hemoglobin (g/dL) 10.44 ± 1.32 12.04 ± 1.87 0.03 S. BUN (mg/dL) 46.55 ± 22.52 18.13 ± 5.88 0.00 S. creatinine (mg/dL) 8.06 ± 3.39 1.15 ± 0.57 0.00 S. calcium (mg/dL) 8.70 ± 1.10 9.12 ± 0.72 0.04 S. phosphate (mg/dL) 5.20 ± 2.05 2.50 ± 1.05 0.00 S. albumin (g/dL) 3.59 ± 0.52 4.06 ± 0.33 0.00 S. globulin (g/dL) 2.83 ± 0.52 2.49 ± 0.35 0.00 HDL (mg/dL) 47.80 ± 12.36 63.45 ± 16.97 0.00 Total bilirubin (mg/dL) 0.45 ± 0.13 0.78 ± 0.39 0.00 AST (IU/L) 14.20 ± 6.30 20.90 ± 8.78 0.01 ALT (IU/L) 12.75 ± 5.63 22.10 ± 12.53 0.01 By the end of the first year, serum hemoglobin, calcium, albumin, HDL, bilirubin, AST, ALT were increased statistically. But serum phosphate, globulin were decreased statistically. In conclusion, successful ABO incompatible living donor kidney transplantation would restore a normal nutritional status even though the patients were performed plasmapheresis during the pre-transplant period.

PREVALENCE OF MALNUTRITION AND IMPACT OF ADVERSE EVENTS OF RADIOTHERY IN CHILDREN WITH CANCER

The objective of the present study was to assess the evolution of nutritional status of children with central nervous system malignancies during radiotherapy. We evaluated 50 children, from July 2000 to August 2007, aged 2-10 years, of both sexes. Nutritional assessment was performed by history, the monitoring was performed weekly (data collected at the beginning and end of treatment) and used z scores of weight for age (WAZ), height for age (HAZ) body mass index for age (BMI/ A) according to the criteria of the World Health Organization (WHO) from 2006-2007. For comparisons of anthropometric measurements at the beginning and end of radiotherapy, we used the paired Student t test. The level of significance was 0.05 and the statistical program used was SPSS, version 17.0. The anthropometric measurements performed confirmed the presence of eutrophia in most of the children (74% initially and 72% at the end of treatment), with no significant difference between time of assessment. There was a statistically significant difference (p = 0.00) in comparison to the z-score height in two periods. Children who had some type of symptom during treatment, such as anorexia (40%), nausea (36%), vomiting (34%), resulting from the irradiated anatomical region, showed no significant changes in body weight (p = 0.66). We conclude that Radiotherapy outpatients had adequate nutritional status, which was maintained during treatment.

The prevalence of malnutrition and the evolution of nutritional status in patients with moderate to severe forms of Crohn’s disease treated with Infliximab

Malnutrition is variably encountered in adult patients with Crohn's disease. We evaluated the nutritional status at the beginning and during Infliximab treatment in patients with Crohn's disease. Patients with moderate/severe flares of disease treated with Infliximab for induction and maintenance of remission were included in a prospective observational study. Body Mass Index and Nutritional Risk Index were calculated in each patient at 0, 6 weeks and than every 8 weeks for one year. From 30 patients treated with Infliximab 59.3% had low BMI, 35.7% being undernourished. The severity of Crohn's disease did not correlate with low BMI but did correlate with Nutritional Risk Index (p=0.001). In all patients that responded to Infliximab treatment progressive weight gain was observed, all but one patient reaching normal BMI after one year. Mean weight gain was significantly more elevated (p=0.001) and time needed to reach normal BMI was longer in the undernutrition group (p=0.01). Clinical remission was the principal factor associated with weight gain (p=0.001), while there was no influence of endoscopic remission on nutritional status. In patients with moderate/severe forms of Crohn's disease malnutrition is frequently encountered. Induction and maintenance treatment with Infliximab determines weight gain and corrects malnutrition in all patients with clinical remission.

Evolution of nutritional status in a cohort of school age children

Considering the high prevalence of obesity among children attending elementary schools, it is important to know the evolution of body weight when these children reach adolescent. To analyze the changes in nutritional status of children between the first year of elementary school and the first year of high school. A historical cohort of children that were assessed when they started elementary school in 1997 was evaluated again eight years later Weight and height were measured and body mass index (BMI) was calculated. Obesity was considered as a BMI over percentile 95 of Center for Disease Control (CDC) references. The concordance between nutritional assessment in both periods and the risk of obesity during adolescence, based on previous weight were also calculated. Data from 117,815 children were analyzed. The prevalence of obesity in the first year of elementary school and the first year of high school was 14.6% and 7%, respectively. The mean weight increase during the eight years period was 32.6+/-8.4 kg corresponding to 108%+/-28.1% of the expected increase. There was a low diagnostic concordance between both assessment periods. There was a reduction of under and overweight and a higher proportion of subjects with normal weight in the second assessment period. The risk for being obese in the first year of high school was 6.4 times greater for children that were obese in the first year of elementary school (confidence intervals 6.1-6.9. There was an important reduction in the proportion of obesity between the age of 6 and 14 years. The risk of obesity at 14 years of age was strongly influenced by the presence of obesity at 6 years of age. The broader BMIranges for normality for high school children could give a false image of the nutritional status of teenagers .