Octodon degus, a mainly diurnal rodent, characterized by its ability to shift to a nocturnal locomotor pattern under laboratory conditions, was studied to determine whether restricted food access during the scotophase could induce nocturnalism. To address this question, wheel running activity, feeding, and body temperature rhythms were analyzed for diurnal degus housed with a wheel and subjected to either long (12 h) or short (2 h) food availability periods, in the latter case with random or scheduled food access times. The results show that allowing nocturnal feeding for 2 h, but not 12 h, can shift a previous diurnal phase preference for wheel running activity and body temperature to the scotophase, with random feeding being more effective than scheduled food availability. However, this behavioral inversion proved to be unstable, as the degus returned to the diurnal phase within only a few days after the restricted feeding was discontinued. In addition, the negative masking effect induced by light, which is characteristic of the degus' nocturnal chronotype, was not observed when the animals were forced to feed at night. Thus, neither long, short, random, nor scheduled food-availability during the scotophase was able to induce all the characteristics of the nocturnal chronotype in Octodon degus.

The prevalence and incidence of overweight and obesity worldwide continues to increase, as well as diseases related to these conditions. This is attributed to an increase in energy intake and a decrease in energy expenditure. Consumption of green tea has been linked to a reduction in body fat and body weight. However, research on green tea has been very diverse. This review assesses the investigations that have been made with green tea and its epigallocatechin gallato (EGCG) content, evaluating its effect on body fat and body weight in humans. A search was made in the PubMed and Web of the Science databases that gave a first total result of 424 potential articles; 409 were excluded and 15 articles were used for this systematic review. Research has been very varied, however, daily consumption of green tea with doses of EGCG between 100 and 460 mg/day has shown greater effectiveness on body fat and body weight reduction in intervention periods of 12 weeks or more. In addition, the use of caffeine doses between 80 and 300 mg/day has been shown to be an important factor for this effects, when the participants did not have a high caffeine intake (> 300 mg/day) prior to the intervention.

No abstract

No abstract

No abstract

No abstract

ResumenEl propósito de esta investigación fue analizar el papel de la composición corporal, la insatisfacción corporal y el modelo de delgadez sobre el riesgo de desarrollar trastornos del comportamiento alimentario (TCA). Participaron 289 estudiantes universitarias, quienes contestaron el Cuestionario de Actitudes Alimentarias, el Cuestionario de Bulimia de Edimburgo y el Cuestionario de Influencias del Modelo Estético Corporal. La composición corporal se analizó por medio de bioimpedancia eléctrica. Se encontró que 9.69% de las mujeres presentaron riesgo de TCA, siendo mayor el porcentaje entre las mujeres que tenían peso normal y cantidades excesivas de grasa corporal. La insatisfacción corporal predijo el riesgo de anorexia nerviosa, y la interacción entre insatisfacción corporal, influencia de la publicidad e índice de masa corporal predijo el riesgo de bulimia nerviosa. Se concluye que la insatisfacción corporal juega un papel relevante en la predicción de riesgo de TCA. Palabras clave: composición corporal, modelo de delgadez, insatisfacción corporal, riesgo de trastorno del comportamiento alimentario y jóvenes. AbstractThe purpose of this research was to examine the role of body composition, body dissatisfaction, and thinness model on the risk of developing eating disorders (ED). The sample comprised 289 female students who answered the Eating Attitudes Test, the Bulimic Investigatory Test, Edinburgh, and the Questionnaire on Influences on Body Shape Model. The body composition was assessed by electrical impedance. The results showed that the risk for having an ED was found in 9.69% of women, and the percentage was high among normal weight women, especially women who had excessive body fat. The body dissatisfaction predicted the risk for anorexia nervosa, and the interaction between body dissatisfaction, influence of advertisement and body mass index predicted the risk for bulimia nervosa. These findings suggest that the role of body dissatisfaction was relevant to predict the risk for ED.

efectos post-privación con Dos alternativas energéticas en ratas 1 Post-DePrivation effects WitH tWo engergetic alternatives in rats alma gaBriela martínez y antonio lópez-espinoza 2 univeRsidad de guadalaJaRa resumen veinticuatro ratas Wistar (3 meses de edad) se dividieron en cuatro grupos y fueron expuestas a libre acceso a alimento y agua durante quince días, seguidos de tres días de privación de alimento. Posteriormente cada grupo mantuvo libre acceso a alimento y a una de tres soluciones de agua con glucosa durante cinco días. La primera solución proporcionó 45g de glucosa/200ml de agua (180 calorías), la segunda 30g de glucosa/200ml (120 calorías) y la tercera 15g de glucosa/200ml (60 calorías). El grupo control no recibió ninguna solución de agua con glucosa. el contenido energético del alimento no fue modificado. Los resultados mostraron que variar el contenido calórico del agua modifica la conducta alimentaria posterior a periodos de privación de alimento. Palabras clave: calorías, glucosa, privación de alimento, periodo post-privación, peso corporal, consumo de alimento, consumo de agua, ratas.