The relationship among disordered eating behavior, power of food scale and sensitization of the reinforcing value of food.

INTRODUCTION: Disordered eating behaviors are a current public health concern since their progression can lead to the development of a full criteria eating disorder. Sensitization to repeated intake of high energy density (HED) foods is associated with excess weight gain over time, but less is known about relationships with assessments of disordered eating. Thus, this study aims to understand how disordered eating behaviors refunlate to the influence of the food environment and sensitization. METHOD: 163 adolescents - 50 % female and 13.2 mean age - were followed for 24 months. Sensitization was assessed by comparing the relative reinforcing value (RRV) of HED food at baseline and after two weeks of daily intake; sensitization was defined as RRV of food after repeated intake. Study participants also completed the EDE-Q, and Power of Food Scale (PFS). We conducted multivariate general linear models to examine these associations. RESULTS: Sensitization status and PFS scores at baseline were positively associated with EDE-Q subscale scores cross-sectionally, but not longitudinally, at baseline and 24 months. We found that sensitization to HED food and higher susceptibility to food cues relates to increased disordered eating behaviors and both at baseline and at 24-months. DISCUSSION: These findings suggest that sensitization to repeated HED food intake and the food environment might be a risk factor for later engagement in disordered eating behaviors. Future studies should address the temporal relationships among these factors and the role that social norms around body weight and weight stigma may play in the development of these behaviors.

Restriction and Pressure to Eat Are Associated Cross-Sectionally, But Not Longitudinally, With BMI z-Score in a Longitudinal Cohort Study of Adolescents.

Background: Parents can influence child weight through their use of food parenting practices, although data are limited in adolescents. The purpose of this study was to examine the cross-sectional and longitudinal relationships between BMI z-Score (zBMI) and restriction and pressure to eat in adolescents. Methods: Adolescents (12-14 years of age at baseline; N = 236) had their height/weight measured at baseline and 24 months and their parent completed the Child Feeding Questionnaire. Linear regressions examined relationships between food parenting practices and zBMI. Results: Cross-sectionally, restriction was positively associated with zBMI at both baseline (ß = 0.28, p < 0.001) and 24 months (ß = 0.141, p = 0.039). In contrast, pressure to eat was negatively associated with zBMI at both baseline (ß = -0.30, p < 0.001) and 24 months (ß = -0.31, p < 0.001). Neither restriction (ß = -0.028, p = 0.446) nor pressure to eat (ß = -0.027, p = 0.493) at baseline predicted 2-year changes in zBMI. zBMI at baseline did not predict 2-year changes in either restriction (ß = -0.003, p = 0.965) or pressure to eat (ß = -0.056, p = 0.611). Conclusion: Findings highlight that adolescents perceive moderate levels of restriction and pressure to eat, with levels differing by weight status. These findings suggest that the bidirectional relationships between child weight status and food parenting practices are likely established before adolescence, but persist throughout adolescence. Further longitudinal studies should examine the impact of restriction and pressure to eat early in childhood on weight trajectories into adolescence and adulthood. Clinicaltrials.gov: NCT04027608.

The Influence of Relative Reinforcing Value of Food, Sensitization, Energy Intake and Diet Quality on zBMI Change over Two Years in Adolescents: A Longitudinal Cohort Study.

The relative reinforcing value (RRV) of food and sensitization are associated with zBMI and zBMI change over time, but the mechanisms underlying these relationships is unknown. The purpose of this study was to test the hypothesis that greater RRV and sensitization to HED food is associated with lower diet quality and greater energy intake at baseline and again at 24 months and that these relationships result in greater zBMI gain. The RRV of HED and LED food and dietary intake were measured at baseline and again after 24 months in a cohort of 202 boys and girls of 12-14 years old. The baseline RRV of HED food was associated with lower diet quality and lower energy intake at 24 months. zBMI gain was positively associated with the baseline energy intake but not baseline RRV of HED food or diet quality. However, diet quality moderated the relationship between baseline energy intake and zBMI change, with no difference in zBMI change as a function of energy intake when diet quality was high but significant and opposite relationships with energy intake when diet quality was low. This study suggests that high diet quality can reduce the negative impact of greater energy intake on zBMI change in adolescents.

The Role of Zinc in Thyroid Hormones Metabolism.

Thyroid hormones play an important role in body homeostasis by facilitating metabolism of lipids and glucose, regulating metabolic adaptations, responding to changes in energy intake, and controlling thermogenesis. Proper metabolism and action of these hormones requires the participation of various nutrients. Among them is zinc, whose interaction with thyroid hormones is complex. It is known to regulate both the synthesis and mechanism of action of these hormones. In the present review, we aim to shed light on the regulatory effects of zinc on thyroid hormones. Scientific evidence shows that zinc plays a key role in the metabolism of thyroid hormones, specifically by regulating deiodinases enzymes activity, thyrotropin releasing hormone (TRH) and thyroid stimulating hormone (TSH) synthesis, as well as by modulating the structures of essential transcription factors involved in the synthesis of thyroid hormones. Serum concentrations of zinc also appear to influence the levels of serum T3, T4 and TSH. In addition, studies have shown that Zinc transporters (ZnTs) are present in the hypothalamus, pituitary and thyroid, but their functions remain unknown. Therefore, it is important to further investigate the roles of zinc in regulation of thyroid hormones metabolism, and their importance in the treatment of several diseases associated with thyroid gland dysfunction.

Influência do Tratamento Quimioterápico no Comportamento Alimentar e Qualidade de Vida de Pacientes Oncológicos / Influence of Chemotherapy Treatment on Eating Behavior and Quality of Life of Oncologic Patients / Influencia del Tratamiento de Quimioterapia en el Comportamento Alimentario y Calidad de Vida de los Pacientes con Cáncer

Introdução: O câncer é uma doença de origem multifatorial, com crescimento irregular e descontrolado de células, cujo tratamento pode desencadear aversões alimentares e mudanças na qualidade de vida. Objetivo: Avaliar a influência do tratamento quimioterápico no comportamento alimentar e na qualidade vida de pacientes oncológicos. Método: Estudo longitudinal e observacional, realizado de junho a outubro de 2018, no Hospital Universitário da Universidade Federal do Piauí. Os dados foram obtidos em dois momentos: T0, socioeconômicos, demográficos, clínicos, de comportamento alimentar e qualidade de vida; e T1, de comportamento alimentar e qualidade de vida. Foram utilizados os testes Shapiro-Wilk, t-Student e Wilcoxon; Pearson e Spearman com p< 0,05. Resultados: Dos 17 pacientes, a maioria era do sexo feminino (82,4%), média de 54,2 anos, renda familiar de um a dois salários mínimos (64,7%) e de etnia parda (76,5%). O câncer mais frequente foi o de mama (52,9%). Houve aversões alimentares em T1 para: "sopas e massas" (p=0,001), "carnes e peixes" (p=0,016), e "doces, sobremesas e aperitivos" (p=0,001). Houve diferença significativa na qualidade de vida quanto à medida global de saúde (p=0,001) e dificuldade financeira (p=0,026), assim também como nas correlações entre qualidade de vida e comportamento alimentar. Conclusão: Os resultados reforçam a necessidade de constante monitoramento nutricional desde o início do tratamento quimioterápico com o intuito de evitar e/ou reduzir suas repercussões negativas no estado nutricional e, consequentemente, na qualidade de vida. Além disso, a realização de mais estudos, com amostra e intervalo de tempo maiores, é necessária.

Introduction: Cancer is a multifactorial disease with uncontrolled cells growth, whose treatment can trigger food aversions and changes in quality of life. Objective: To evaluate the influence of chemotherapy treatment on eating behavior and quality of life of oncologic patients. Method: A longitudinal and observational study, carried out from June to October of 2018, at the University Hospital of the Federal University of Piauí. The data were obtained in two moments: T0, socioeconomic, demographic, clinical, food behavior and quality of life, and T1, food behavior and quality of life. The following tests were used: Shapiro-Wilk, t-Student and Wilcoxon; Pearson and Spearman, with p <0.05. Results: Of the 17 patients, the majority were females (82.4%), medium age of 54.2 years, family income of 1 to 2 minimum wages (64.7%) and ethnics, brown (76.5%). Breast cancer was the most frequent (52.9%). There were food aversions in T1, for "soups and pastas" (p=0.001), "meats and fish" (p=0.016), and "sweets, desserts and appetizers (p=0.001). There was a significant difference in quality of life regarding the general health status (p=0.001) and financial difficulty (p=0.026), as well as in correlations between quality of life and food behavior. Conclusion: The results reinforce the need of constant nutritional monitoring since the beginning of the chemotherapy in order to avoid and/or reduce the negative repercussions on the nutritional status and, consequently, on the quality of life. In addition, more studies with longer time ranges and larger samples are required.

Introducción: El cáncer es una enfermedad de origen multifactorial, con crecimiento descontrolado de células, cuyo tratamiento puede desencadenar aversiones alimenticias y cambios en la calidad de vida. Objetivo: Evaluar la influencia del tratamiento quimioterápico en el comportamiento alimentario y en la calidad de vida de pacientes oncológicos. Método: Estudio longitudinal y observacional, realizado de junio a octubre de 2018, en el Hospital Universitario de la Universidad Federal de Piauí. Los datos fueron obtenidos en dos momentos: T0, socioeconómicos, demográficos, clínicos, de comportamiento alimentario y calidad de vida y T1, de comportamiento alimentario y calidad de vida. Se utilizaron las pruebas: Shapiro-Wilk, t-Student y Wilcoxon; Pearson y Spearman, con p <0,05. Resultados: De los 17 pacientes, la mayoría eran mujeres (82,4%), promedio de 54,2 años, ingreso familiar de 1 a 2 salarios mínimos (64,7%) y de etnia parda (76,5%). El cáncer más frecuente fue el de mama (52,9%). Se observaron aversiones alimentarias en T1, para algunos grupos de alimentos. Se observó una diferencia significativa em la calidad de vida en cuanto a la medida global de salud (p=0,001) y dificultad financiera (p=0,026), así como las correlaciones entre calidad de vida y comportamiento alimentario. Conclusión: Los resultados refuerzan la necesidad de constante monitoreo nutricional desde el inicio del tratamiento quimioterápico con el fin de evitar y/o reducir lãs repercusiones negativas de este en el estado nutricional y en calidad de vida. Además, la realización de más estúdios com muestra e intervalo de tempo mayor, son necesarios.