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ABSTRACT Background: Several mechanisms, including excessive hunger, account for patients' difficulties in maintaining weight loss and dietary changes after caloric restriction. Objective: To evaluate the effect of short-term high-fiber calorie-restricted diet in appetite-regulating hormones, and hunger and satiety sensations in women with obesity. Methds: In a randomized controlled trial study, thirty women with body mass index (BMI) higher than 30 kg/m2, and aged from 20 to 50 years were hospitalized following a calorie-restricted diet (1000 kcal/day) for three days. The experimental group (n=15) received high-fiber diet and the control group (n=15), conventional diet. Body weight, BMI, resting energy expenditure (REE), acylated and total ghrelin, leptin, insulin and glucose, and hunger and satiety sensations were evaluated. Linear regression models with mixed effects (fixed and random effects) helped to assess the variables between the two groups and within the groups. Results: Body weight and BMI decreased in both the experimental and control groups (P<0.001). After the high-fiber diet, postprandial acylated ghrelin (P=0.04), glucose (P<0.001), insulin (P=0.04), and leptin (P=0.03) levels as well as the HOMA-IR index (P=0.01) decreased, whereas satiety improved (P=0.02). Obese women that followed the conventional diet had increased body fat percentage (P=0.04) and lower REE (P=0.02). The two diets did not differ in terms of hunger sensation. Conclusion: A short-term high-fiber diet improves satiety sensations and metabolic parameters while suppressing postprandial acylated ghrelin (60 minutes) and maintaining the resting energy expenditure.
RESUMO Contexto: Vários mecanismos, incluindo a fome excessiva, são responsáveis pelas dificuldades dos pacientes em manter a perda de peso e mudanças na dieta após a restrição calórica. Objetivo: Avaliar o efeito da dieta de curta duração rica em fibras e com restrição calórica nos hormônios reguladores do apetite e nas sensações de fome e saciedade em mulheres com obesidade. Métodos: Em um estudo randomizado controlado, 30 mulheres com índice de massa corporal (IMC) superior a 30 kg/m2 e com idade entre 20 e 50 anos foram hospitalizadas seguindo dieta com restrição calórica (1000 kcal/dia) por 3 dias. O grupo experimental (n=15) recebeu dieta rica em fibras e o grupo controle (n=15), dieta convencional. Foram avaliados peso corporal, IMC, gasto energético de repouso (GER), grelina acilada e total, leptina, insulina e glicose e sensações de fome e saciedade. Modelos de regressão linear com efeitos mistos (efeitos fixos e aleatórios) ajudaram a avaliar as variáveis entre os dois grupos e dentro dos grupos. Resultados: O peso corporal e o IMC diminuíram tanto no grupo experimental quanto no controle (P<0,001). Após a dieta rica em fibras, os níveis de grelina acilada pós-prandial (P=0,04), glicose (P<0,001), insulina (P=0,04) e leptina (P=0,03), bem como o índice HOMA-IR (P=0,01) diminuiu, enquanto a saciedade melhorou (P=0,02). Mulheres obesas que seguiram a dieta convencional apresentaram aumento do percentual de gordura corporal (P=0,04) e menor GER (P=0,02). As duas dietas não diferiram em termos de sensação de fome. Conclusão: Uma dieta rica em fibras de curto prazo melhora as sensações de saciedade e os parâmetros metabólicos, suprimindo a grelina acilada pós-prandial (60 minutos) e mantendo o gasto energético de repouso.
RESUMO
OBJECTIVES: The present study was designed to evaluate the bone phenotypes and mechanisms involved in bone disorders associated with hepatic osteodystrophy. Hepatocellular disease was induced by carbon tetrachloride (CCl4). In addition, the effects of disodium pamidronate on bone tissue were evaluated. METHODS: The study included 4 groups of 15 mice: a) C = mice subjected to vehicle injections; b) C+P = mice subjected to vehicle and pamidronate injections; c) CCl4+V = mice subjected to CCl4 and vehicle injections; and d) CCl4+P = mice subjected to CCl4 and pamidronate injections. CCl4 or vehicle was administered for 8 weeks, while pamidronate or vehicle was injected at the end of the fourth week. Bone histomorphometry and biomechanical analysis were performed in tibiae, while femora were used for micro-computed tomography and gene expression. RESULTS: CCl4 mice exhibited decreased bone volume/trabecular volume and trabecular numbers, as well as increased trabecular separation, as determined by bone histomorphometry and micro-computed tomography, but these changes were not detected in the group treated with pamidronate. CCl4 mice showed increased numbers of osteoclasts and resorption surface. High serum levels of receptor activator of nuclear factor-κB ligand and the increased expression of tartrate-resistant acid phosphatase in the bones of CCl4 mice supported the enhancement of bone resorption in these mice. CONCLUSION: Taken together, these results suggest that bone resorption is the main mechanism of bone loss in chronic hepatocellular disease in mice.