ABSTRACT
ABSTRACT Purpose: to evaluate the effect of low-calorie diet on 24-hour urinary metabolic parameters of obese adults with idiopathic calcium oxalate kidney stones. Materials and Methods: Adult idiopathic calcium oxalate stone formers, with body mass index (BMI) ≥30kg/m2 and a known lithogenic metabolic abnormality, were submitted to low-calorie diet for twelve weeks. After enrolment, anthropometric measures, serum exams, 24-hour urinary metabolic parameters and body impedance were collected one month prior to dietary intervention and at the end of twelve weeks. Correlations between weight loss, waist circumference loss, fat loss and variation in 24-hour urinary lithogenic parameters and calcium oxalate urinary supersaturation (CaOx SS) as per Tiselius equation were analysed. Results: From January 2017 to January 2018, 39 patients were enrolled to participate in this study. Median (range) prescribed diet was 1300 (1100-2100) Kcal/day. Mean age was 51.7±11.0 (29-68) years old and 69.2% were female. 30.8% of the participants shifted from obesity to BMI <30kg/m2 and none to BMI <25kg/m2. A significant correlation was found between baseline 24-hour urinary oxalate and weight (p=0.018) and BMI (p=0.026). No correlation was found between variation of weight, waist circumference, fat mass and 24-h urinary stone risk factors or CaOx SS. Conclusions: Short-term modest weight loss induced by twelve weeks of low-calorie diet is not associated with a decrease of 24-hour urinary lithogenic parameters in idiopathic calcium oxalate stone formers. Calcium oxalate urinary stone formation is probably multifactorial and driven by other factors than weight.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Kidney Calculi/etiology , Urinary Calculi , Calcium Oxalate , Calcium , Caloric Restriction , Obesity/complicationsABSTRACT
Objetivo: Avaliar um esquema de realimentação utilizado em pacientes após jejum prolongado voluntário. Métodos: Foi realizado estudo retrospectivo, com base em levantamento dos prontuários de 7 pacientes (média de idade de 41,6 anos e desvio-padrão=5,3) em jejum voluntário por 43 dias em jejum seguidos de 14 dias de realimentação. As variáveis estudadas foram: antropométricas, clínicas, dietéticas, laboratoriais e avaliação da composição corpórea por bioimpedância. Foram utilizadas as seguintes dietas por via oral na realimentação: oligomérica enriquecida com glutamina, associada à dieta hipogordurosa e isenta de lactose (primeira semana); dieta branda normolipídica com lactose (segunda semana). A análise descritiva dos dados apresentados incluiu média e desvio-padrão. A análise de variância ou o teste não paramétrico de Kruskal-Wallis foramutilizados para comparação dos dados nos períodos de jejum e realimentação. Utilizou-se o programa estatístico SIGMA STAT versão 2,03 sendo considerado o nível de significância de 5%. Resultados: No jejum houve redução significativa do peso corpóreo (18,0% desvio-padrão=2,3), da prega cutânea do tríceps (48,2% desvio-padrão=9,0) e da hemoglobina (15,98g/dL desvio-padrão=0,99 para 12,74g/dL desvio-padrão=0,47). Na segunda semana de realimentação houve aumento significativo na contagem total de linfócitos (954 mil/mm3 desvio-padrão=242 para 1.619 mil/mm3 desvio-padrão=232) e dos distúrbios gastrointestinais, em relação à primeira semana. Não ocorreu Síndrome da Realimentação. Conclusão O esquema de realimentação utilizado promoveu resultado global adequado, mas requer redução do aporte energético e definição de momento mais adequado para reintrodução de lactose e da dieta normolipídica.
Objective: To evaluate a refeeding plan employed in patients after a long period of voluntary fasting. Methods: A retrospective study was done by reviewing the medical records of 7 male patients (mean age of 42.0 years; standard deviation of 5.3 years) who were refed for 14 days after a 43-day fast. The studied variables were:clinical, anthropometric; biochemical and body composition by bioimpedance analysis. The following diets were used orally in the refeeding program: glutamine-enriched oligomeric diet associated with a low-fat lactose-free diet (first week); normal-fat diet with lactose (second week). Descriptive analysis of the data included mean and standard deviation. Analysis of variance or the non-parametric Kruskal-Wallis test was used to compare data during the fasting and refeeding periods. The SIGMA STAT statistics software package version 2.03 was used to analyze data with the significance level set at 5% (p<0.05). Results: During the fasting period there was a significant reduction in body weight (18.0%; standard deviation=2.3), triceps skinfold (48.2%; standard deviation=9.0) and hemoglobin concentration (from 15.98g/dL; standard deviation=0.99 to 12.74g/dL; standard deviation=0.47). During the second week of refeeding, there was a significant increase in total lymphocyte count (from 954 thousand/mm3; standard deviation=242 to 1.619 thousand/mm3; standard deviation=232); and gastrointestinal problems when compared with the first week. No case of refeeding syndrome was observed.Conclusion The refeeding program used promoted a satisfactory global result but it is necessary to reduce energy intakeand define the best moment to reintroduce lactose and a normal-fat diet.