Appetite最新文献

While individuals tend to display poorer inhibitory control toward food-related than neutral stimuli, it is unclear whether this challenge is specific to food or extends to other pleasant stimuli. Uncertainty also remains regarding the general impact of hunger on inhibition. To address these questions, we used a within-subjects design whereby 44 healthy adults completed two go/no-go tasks including no-go images of highly palatable foods and no-go images of animals matched for valence and physical properties. Both tasks were completed one week apart in either a fed or a fasted state. Prefrontal cortex activity was measured using functional near-infrared spectroscopy. Poorer behavioral inhibition was observed when participants needed to withhold their response to images of food compared to animals, regardless of hunger state. In addition, more commission errors were made in the fasted compared to the fed condition, regardless of the type of image to avoid responding to. Responses to go trials were slower when these trials were interspersed with food compared to animal no-go trials. However, hunger did not influence go response time. Greater activation was observed in the dorsolateral prefrontal cortex during blocks of trials with (vs. without) no-go images, but brain activity did not differ according to the type of no-go image. The effect of hunger on prefrontal brain activity was also not significant. Exploratory correlations showed that food-related inhibition deficits were positively related to self-reported impulsivity, but unrelated to body mass index. This study suggests that even among healthy adults, food-related inhibitory control may have a unique behavioral signature beyond general inhibition toward pleasant stimuli. Hunger also exerts an independent influence on general inhibitory capabilities, highlighting the importance of carefully controlling hunger levels in inhibition studies.

Mealtimes and feeding practices are shaped by culture and have long-term implications for social and emotional wellbeing. To date, there has been little research in Australia that has focused on First Nations families' feeding practices and mealtimes. This co-designed study aimed to explore First Nations' families feeding practices through yarning circles with workers (n = 14) at an Aboriginal Community Controlled Organization. Most workers (79%) were Aboriginal and/or Torres Strait Islander and all worked directly with First Nations families. Using thematic analysis, four themes were inductively identified from the yarns: the importance of childhood experiences, history, and intergenerational knowledges; mealtimes as a point of connection and wellbeing; the impact of structural barriers on feeding practices; and the important roles of First Nations workers supporting families with feeding difficulties. Workers described how First Nations families' feeding practices and mealtimes are informed by cultural values and knowledge that have been passed down through generations. Yet throughout the yarns, participants highlighted the impact of historical and current structural factors (e.g., cost of living, child removal, housing) that affect families' ability to engage in feeding practices that align with their beliefs and culture. Workers described several strengths-based approaches they use to support families, including community-led mealtime groups, liaising with mainstream health services, and providing a respectful space. We propose that the Social and Emotional Wellbeing model is a holistic strengths-based resource for workers to conceptualize First Nations families’ strengths, values, and challenges in relation to feeding and mealtimes. More co-designed research including the perspectives of First Nations families is needed to better understand healthy and culturally aligned feeding and mealtime practices.

Low-protein diets affect body weight, body composition, food intake, and food preferences in mice. Furthermore, single periods of protein restriction can have lasting effects on these parameters. We sought to examine the effect of multiple, short, bouts of protein restriction, relative to long-term maintenance on either a control (NR) or protein-restricted (PR) diet. We found that male mice experiencing intermittent protein restriction (IPR) were indistinguishable from NR mice in terms of body weight and composition, but had food intake and plasma ghrelin as high as mice on PR diet, even when they were returned to control diet. This was not found in female mice. The results of this experiment highlight the importance of diet history on food intake and ghrelin levels in male mice, and the difference in how PR diet might affect male and female mice.

Background

Body shame is an established antecedent and maintaining factor of binge eating, beyond global negative affect and body weight, and partly through the effects of dietary restriction. These associations have mainly been established in women and are understudied in men. Body image flexibility, a concept from Acceptance and Commitment Therapy, may be a protective psychological process against the effects of negative body image on binge eating.

Methods

Using structural equation modeling and a non-clinical sample of 244 women and 185 men, this cross-sectional study tested an integrated model of the association between body shame and binge eating, mediated by dietary restriction and moderated by body image flexibility, controlling for depressive symptoms and BMI.

Results

Body shame predicted binge eating in women but not in men, whereas depressive symptoms predicted binge eating in men but not in women. Body image flexibility moderated the association between body shame and binge eating in women.

Conclusions

These cross-sectional findings highlight the importance of considering gender differences in current negative affect models of binge eating, and further support the role of body image flexibility in attenuating the influence of body shame on binge eating in women. Longitudinal studies are required to examine the temporal dynamics between these variables.

The current study replicated and extended the gratitude model of body appreciation and intuitive eating in Chinese women. Using a sample of 957 young Chinese women, Structural Equation Modeling (SEM) was employed to test two previously established models derived from samples of American (original model) and Japanese (modified model) women. Results indicated that the modified model had a better fit and was largely replicated in the Chinese context. Higher gratitude was associated with lower appearance and others’ approval of self-worth, higher body appreciation, and greater intuitive eating. Also, we further extended the model by exploring whether and how the model could explain intuitive eating facets. Results showed unique links between the core variables in the model and each facet of intuitive eating. Specifically, findings of the excellent model fit indicate that interventions focused on cultivating gratitude may be promising in promoting body appreciation and intuitive eating in young Chinese women. Also, interventions based on the model might be modified to address specific facets of intuitive eating, which may enhance the effectiveness of future interventions. Future research should use longitudinal and experimental designs and develop culturally adapted models to advance our understanding of how the gratitude model of body appreciation and intuitive eating applies to Chinese women.

A high-fat diet has negative effects on physical, neurological, and behavioral outcomes. One consistent finding is that a diet high in fat increases impulsive choice behavior—behavior that is linked to a wide range of other negative health behaviors. While the mechanism for this increase in impulsive choice is not well understood, exercise, with its well-known and many benefits, may serve as an effective and accessible way to combat increased impulsive choice associated with a high-fat diet. The goal of this work was to test this possibility. Rats were divided into four groups in a two-by-two factorial design: exercise and control diet, sedentary and control diet, exercise and high-fat diet, sedentary and high-fat diet. Rats in the exercise groups engaged in 30-min of forced, moderate intensity wheel-running exercise five days per week. Rats in the high-fat diet groups ate a diet high in fat. Impulsive choice was measured using a delay discounting task. Exercise prevented weight gain associated with the high-fat diet. Exercise also preserved relative motivation for food reinforcement. However, exercise did not prevent increases in impulsive choice observed for rats that consumed a high-fat diet relative to the rats that consumed the control diet. This work rules out several possible mechanisms by which a high-fat diet may increase impulsive choice behavior. It makes clear that exercise alone may not stave off increases in impulsive choice caused by a high-fat diet. Future work is necessary to uncover the underlying mechanism for this effect and discover interventions, perhaps ones that combine both physically and cognitively demanding activities, to improve health and behavior as it relates to decision making processes.

Nesfatin-1, derived from the nucleobindin 2 (NUCB2) precursor, is a potent anorexigenic peptide that was discovered in 2006. Since its identification in the hypothalamus, it has been shown to have wide ranging actions within and outside of the central nervous system. One of these actions is the regulation of inflammation, which could potentially be exploited therapeutically in the context of obesity-associated inflammation in adipose tissue. Here, we review recent advances in our knowledge about the ability of nesfatin-1 to control inflammation by regulating NFκB signaling, which likely attenuates pro-inflammatory cytokine production and inhibits apoptosis.

The consumption of animal-source foods, and particularly red meat from ruminants, is a major contributor to greenhouse gas emissions, freshwater use, and loss of biodiversity. Reducing red meat consumption has been identified as a key strategy to mitigate climate change; however, little is known about how to effectively intervene to promote its reduction in the United States (US). This study aimed to examine meat (red, unprocessed, and poultry) and seafood consumption patterns, the factors influencing their consumption (including a reduction in their consumption over time), and how these differed based on socioeconomic variables. The study was conducted through an online survey with a representative sample of the US population (n = 1224) in 2021 using KnowledgePanel®. Overall, we found that most participants reported consuming red meat (78%), processed meat (74%), or poultry (79%) 1–4 times per week, with several differences in consumption patterns based on socio-demographic characteristics. A substantial proportion of the population reported reducing their red (70%) and processed meat (64%) consumption over the previous year, which was much higher than those that reported reducing poultry (34%) or seafood (26%). Key factors influencing red meat reduction were health and price, while environmental sustainability and animal welfare were less important, particularly among certain socio-demographic groups. These findings can help provide insight into how best to frame messaging campaigns aimed at shifting red meat consumption in the US to support climate change mitigation. Focusing on the factors that resonate more with consumers is more likely to lead to shifts in consumption patterns.

There is growing evidence that shifts in food consumption have the potential to mitigate the environmental impacts of food systems. Yet, although Canadians are increasingly concerned about climate change, changes towards more sustainable food consumption patterns are not widely observed. Understanding consumers' perspective on these issues is crucial for bridging this gap between individual behaviors and collective concerns. This study explores the knowledge, understanding and beliefs of Quebec consumers regarding the environmental impacts of food and their potential for shaping sustainable food consumption. A representative sample of consumers (N = 978) answered an online questionnaire assessing their factual knowledge and investigating their views of food systems impacts. Results indicate low levels of knowledge and highlight widely shared beliefs regarding food systems. Consumers tended to overestimate the role of transport in food's environmental footprint and believe that reducing transport or eating local foods are the most effective ways to improve environmental sustainability. Likewise, consumers tend to underestimate the impact of production, as well as solutions that could effectively reduce this impact. The findings reveal a need for improved literacy and awareness of the environmental impacts of food, thereby highlighting the importance of effective information and education strategies to shape sustainable food consumption habits.

Food choice is a complex function of preferences and combines a myriad of food-related factors, such as biological, economic, physical, social, and psychological determinants. People's food choices directly affect their health and can have both positive and negative outcomes. For instance, the pandemic may have presented an opportunity to cook more at home, eventually resulting in dietary benefits, health improvements, and reduced stress. Conversely, adverse behavioral, psychological, and physical outcomes, such as overeating, have also been associated with stressful situations. Therefore, the aim of this study is twofold: first, to propose “cooking readiness” as a higher-order construct, in which ‘food literacy’ and ‘cooking skills’ correspond to the capability, ‘cooking attitudes’ reflect the motivation, and the variable ‘COVID-19 restrictions’ represent the opportunity for consumers to cook and consume healthier food at home. Furthermore, as the pandemic scenario was imposed and caused changes in mental health and emotional mood, the second objective is to explore the relationship between cooking readiness and stress levels in consumers' choices for nutritionally recommended (or non-recommended) food. Cross-country data (Brazil, Denmark) from 1074 consumers was analyzed using structural equation modeling. This study confirms cooking readiness as a higher-order construct, integrating food literacy, cooking skills, and cooking attitudes with pandemic-induced opportunities. Cooking readiness is crucial in promoting healthier eating habits, particularly in Brazil. The stronger tradition of healthier eating in Denmark may mitigate the impact of cooking readiness on reducing non-recommended food consumption. The varying effects of stress on food choices between the two countries underscore the need for tailored public health strategies that consider cultural differences and existing dietary habits. Promoting cooking skills and food literacy, particularly in times of crisis, can be instrumental in supporting healthier food choices and improving public health.