The COVID-19 pandemic has disproportionately impacted food security and food access in urban communities of colour. Loss of income, often associated with food insecurity, has affected Hispanic, Black, low-wage workers, single mothers and women of colour more than other groups of individuals. Mutual aid organisations have proliferated in response to the COVID-19 pandemic, yet a description of the contributions of these organisations in addressing food insecurity has yet to be described in the literature to date. This article aims to describe the unique role and contributions of mutual aid organisations in addressing food insecurity and food access disparities in Chicago’s communities of colour during the COVID-19 pandemic. Local mutual aid organisations can function as hubs to feed urban communities while reducing food waste and building community. During the pandemic, mutual aid organisations in Chicago have distributed thousands of pounds of food to families and individuals. Mutual aid organisations provide short-term food security while engaging with community members to create a more equitable and sustainable food system. The development of robust mutual aid hubs facilitated unique opportunities for collaboration and expansion of infrastructure that may allow mutual aid organisations to address food access in their communities well into the future.

Twenty-first century urbanization poses increasing challenges for mental health. Epidemiological studies have shown that mental health problems often accumulate in urban areas, compared to rural areas, and suggested possible underlying causes associated with the social and physical urban environments. Emerging work indicates complex urban effects that depend on many individual and contextual factors at the neighbourhood and country level and novel experimental work is starting to dissect potential underlying mechanisms. This review summarizes findings from epidemiology and population-based studies, neuroscience, experimental and experience-based research and illustrates how a combined approach can move the field towards an increased understanding of the urbanicity-mental health nexus.

The urban environment has changed vastly over past decades, which also has had an impact on our sleep and dietary patterns and possibly health outcomes. Some studies have shown that sleep duration and sleep quality has declined over past decades, especially in children. In parallel, our lifestyle and dietary patterns have also changed including more shift work, more meals outside the home or family setting and more irregular eating patterns, including breakfast skipping and late-night eating. This new area of research in nutritional sciences studying the impact of the timing of eating on health outcomes is called chrono-nutrition, and combines elements from nutritional research with chrono-biology. The objectives of this paper were to discuss secular trends in sleep patterns and related dietary patterns, introduce basic concepts and mechanisms of chrono-nutrition and discuss the evidence for the importance of sleep and chrono-nutrition in relation to health outcomes. Overall, chrono-nutrition could mediate the effects between sleep, diet and urbanisation, and more research is needed to elucidate the importance of chrono-nutrition for metabolic health and its impact on public health.

The purpose of this study is to examine how older people make sense of the changing urban environment – that is, how they experience, perceive and interpret their everyday interaction with its materiality, as well as their social ties, networks and relations. The results, based on seven focus groups and 37 individual in-depth interviews with older residents of the three most populous Czech cities, show how older people maintain the continuity of their activities, autonomy and independence within the limits of their personal resources in an active relationship with a changing urban environment and within the post-socialist context. The research supports the results of former studies that emphasise the ability of older adults to negotiate their position and actively cope with change while they age in place.

Floods through inundated urban environments constitute a hazard to the population andinfrastructure. A series of field measurements were performed in an inundated section ofthe City of Brisbane (Australia) during a major flood in January 2011. Using an acousticDoppler velocimeter (ADV), detailed velocity and suspended sediment concentrationmeasurements were conducted about the peak of the flood. The results are discussed with afocus on the safety of individuals in floodwaters and the sediment deposition during theflood recession. The force of the floodwaters in Gardens Point Road was deemed unsafe forindividual evacuation. A comparison with past laboratory results suggested that previousrecommendations could be inappropriate and unsafe in real flood flows.

Concentrations of lead, determined by electrothermal atomic absorption spectrometry, were compared between the cestodes Hymenolepis diminuta and Taenia taeniaeformis and its host rat (Rattus norvegicus). Rats were sampled at 2 sites, which differed in respect to lead pollution as quantified from road dust, adjacent to the city of Cairo, Egypt. Comparing lead levels among host tissues and the parasites the significantly highest accumulation was found in H. diminuta, followed by rat kidney and larvae of T. taeniaeformis. Calculation of bioconcentration factors showed that H. diminuta contained 36-, 29-, 6- and 6-fold higher lead levels than intestinal wall, liver, kidney and larvae of T. taeniaeformis, at the more polluted site. At the less contaminated site lead bioconcentration factors for H. diminuta were found to be 87, 87 and 11 referred to intestine, liver and kidney of the host. Due to a high variability of the lead concentrations in H. diminuta it was not possible to indicate differences in metal pollution between both sampling sites. This variability may be influenced by different age structures of cestode infrapopulations. It is likely that younger worms contain lower metal levels than older worms due to a shorter exposure period. Thus, it is necessary to standardize the sampling of worms which should be used for indication purposes. Due to a lack of adequate sentinel species in terrestrial habitats more studies are required to validate and standardize the use of helminths as accumulation bioindicators in order to obtain mean values with low standard deviations. The host–parasite system rat–H. diminuta appears to be a useful and promising bioindication system at least for lead in urban ecosystems as rats as well as the tapeworm are globally distributed and easily accessible.