The increasing demand for sustainable feed ingredients in aquaculture has driven research into alternative protein sources to replace fishmeal. This study evaluated the nutritional, physiological, and microbiological impacts of housefly (Musca domestica) larvae meal as a replacement for fishmeal in the diets of rainbow trout (Oncorhynchus mykiss). Diets were formulated to replace fishmeal with larvae meal at 50% and 100% inclusion levels. Growth performance, body composition, intestinal health, and gut microbiota were assessed over a 16-week feeding trial. Fish fed larvae meal-based diets exhibited comparable growth metrics, muscle yield, and hepatosomatic index to those fed fishmeal and commercial diets, indicating no compromise in growth efficiency. Intestinal histological examination revealed no diet-induced morphological changes, with all parameters remaining within normal ranges, highlighting the compatibility of larvae meal with fish intestinal health. Analysis of gut microbiota showed a shift toward Firmicutes dominance and increased abundance of Clostridiales in larvae meal-fed fish, suggesting enhanced fermentation activity. Blood chemistry parameters were consistent across dietary groups, supporting the physiological suitability of larvae meal-based diets. These findings demonstrate that housefly larvae meal is a sustainable and nutritionally viable alternative to fishmeal in aquafeeds for rainbow trout. The results underscore its potential to reduce reliance on fishmeal while maintaining fish health and growth performance.

Social networks influence health outcomes, yet declining health can also reshape social ties. While prior research has focused on constrained settings, the impact of health on social networks in fully voluntary contexts remains underexplored. This study examines the reciprocal relationship between health and social networks in voluntary settings, assessing whether previously observed patterns persist. We analyzed three-wave longitudinal whole network data from two voluntary clubs (N = 102, mean age = 54 years) in North-Rhine Westphalia, Germany, using Stochastic Actor-Oriented Models to distinguish between selection and influence effects across self-rated, mental, and physical health measures. Our analyses suggest diverging patterns observed in more constrained settings. We found no evidence of peer influence on health across any measures. While self-rated health showed some evidence of selection effects, social avoidance was limited to individuals with poor physical health. Notably, we found no evidence of withdrawal; instead, individuals with poorer health were more likely to nominate others in the network, suggesting they actively sought social connections as a compensatory strategy. These findings challenge existing assumptions about health-based network dynamics, emphasizing the need to reconsider how social networks function in voluntary contexts. Future research should explore how the degree of setting constraints shape health-related network dynamics.

Depression is the most common mental illness and its profound impact on cognition and decision‐making has implications for political judgement. However, those implications are unclear in the case of referendums offering a choice between status quo and change. On one hand, one component of depression is the kind of life dissatisfaction associated with voting for change. Yet cognitive models also portray depression sufferers as biased towards the status quo: they are less inclined to research change, more pessimistic about its benefits and more likely to exaggerate its potential costs. In this paper, we use data from Understanding Society to examine the impact of those cross‐pressures on support for Brexit. Prior to the referendum, while life dissatisfaction and generally poor health predicted support for Leaving the European Union (EU), those diagnosed with depression were disproportionately likely to support Remain. Supporting our claim that the latter was a sign of status quo bias, this difference disappeared once the result was in and leaving the EU had become the widespread expectation. The study highlights the unexplored importance of mental health for political judgements, emphasises the multidimensionality of conditions like depression and illustrates the psychological role of status quo bias in referendum voting.

This study examines the association between self-reported health and the propensity for supporting citizens’ initiatives in Finland. Democratic innovations such as the citizens’ initiative provide novel ways for citizens to express their preferences, but whether people in poor health make use of such possibilities remains unclear. The data come from the Finnish National Election Study (FNES2015), a cross-sectional representative sample of the Finnish population. The results suggest that self-reported health affects the propensity to sign citizens’ initiatives, but the effect depends on age since it mobilizes young citizens in poor health, whereas the impact on older generations is negligible.

This paper examines the potential for, and the contradictions inherent in, voluntary sector health service providers acting as consumer representatives. The paper examines a U.K. gay men’s HIV prevention organization to consider whether members are united by their experiences of using services, whether their work involves consumerist strategies, if so whether these are influential, and what tensions emerge from the dual provider/consumer role. Fieldwork was carried out in 1997-98, examining, via documents and interviews, activity between 1992 and 1997. Qualitative analysis was performed. Consumer action is shown to emerge not so much from abstract constructions of consumer interest, but more from the particularities of consumption, which become politicized more powerfully through their attachment to other interests and ideologies.

Public health and healthcare issues in China have historically attracted individuals and organizations to engage the health sector. The growth of health philanthropy in post-Mao China raises questions regarding the role of the state in the development of China’s health philanthropy. Through a historical overview of health philanthropy in China as well as an examination of the functions and effectiveness of health-related philanthropic actors in the contemporary era, this study has identified the state as a major factor in the development of China’s health philanthropy. Indeed, even though the post-Mao reform dynamics have expanded space for health-related charity organizations, the state continues to have commanding height in health philanthropy in terms of status, funding, services, and influence. The state dominance in turn negatively affects the registration, financing, and capacity building of private foundations and NGOs in this area. Whether the state will dominate health philanthropy in the future to a large extent hinges upon how much extra space it is willing to concede in order to accommodate the dynamics in China’s philanthropic sector.

Volunteering provides unique benefits to organisations, recipients, and potentially the volunteers themselves. This umbrella review examined the benefits of volunteering and their potential moderators. Eleven databases were searched for systematic reviews on the social, mental, physical, or general health benefits of volunteering, published up to July 2022. AMSTAR 2 was used to assess quality and overlap of included primary studies was calculated. Twenty-eight reviews were included; participants were mainly older adults based in the USA. Although overlap between reviews was low, quality was generally poor. Benefits were found in all three domains, with reduced mortality and increased functioning exerting the largest effects. Older age, reflection, religious volunteering, and altruistic motivations increased benefits most consistently. Referral of social prescribing clients to volunteering is recommended. Limitations include the need to align results to research conducted after the COVID-19 pandemic. (PROSPERO registration number: CRD42022349703).

There is a strong tradition in Britain of volunteering involving a wide range of activities and organisations. Increasingly volunteering is seen as a way of benefiting health and building sustainable communities. In a study in 2007 we aimed to address the research questions: what are the motivations for, barriers to, and benefits of formal practical environmental volunteering for those individuals involved? Qualitative and quantitative data collection was undertaken while spending a day each with ten volunteer groups as they undertook their practical conservation activities. In this paper we focus primarily on the physical, mental and social well-being benefits that volunteers derived from their activities. Our research involved 88 people volunteering regularly in a range of places from scenic natural landscapes to urban green spaces in northern England and southern Scotland. Respondents described a range of benefits they gained from their involvement including improved fitness, keeping alert, meeting others and reducing stress levels. We suggest that practical environmental volunteering has flexibility in the types of activity available and the time scale in which activities are undertaken and therefore can provide a range of physical, social and mental well-being benefits to people with very differing abilities and from different socio-economic backgrounds.

This article explores two theoretical possibilities for why personal health may affect political trust: the psychological‐democratic contract theory, and the role of personal experience in opinion formation. It argues that citizens with health impairments are more likely to experience the direct effects of political decisions as they are more dependent on public health services. Negative subjective evaluations of public services can lower trust levels, especially if people's expectations are high. Using European Social Survey data, the association between health and trust in 19 Western European states is analysed. The results indicate that people in poor health exhibit lower levels of trust towards the political system than people in good health. The differences in trust between those in good and poor health are accentuated among citizens with left‐leaning ideological values. The results suggest that welfare issues may constitute a rare context in which personal, rather than collective, experiences affect opinion formation.

The Interplay of Genes and Environment across Multiple Studies (IGEMS) is a consortium of 21 twin studies from 5 countries (Australia, Denmark, Finland, Sweden, and United States) established to explore the nature of gene–environment interplay in cognitive, physical, and emotional health across the adult lifespan. The combined data from over 145,000 participants (aged 18 to 108 years at intake) has supported multiple research projects over the three phases of development since its inception in 2010. Phases 1 and 2 focused on launching and growing the consortium and supported important developments in data harmonization, analyses of data pooled across multiple studies, incorporation of linkages to national registries and conscription data, and integration of molecular genetic and classical twin designs. IGEMS Phase 3 focuses on developing appropriate infrastructure to maximize utilization of this large twin consortium for aging research.