Many agree that increasing physical activity will improve public health. This paper reports on empirical findings on the relationship between the density of the residential environment, walking and total physical activity. Using multiple objective and self-reported measures for 715 participants in the US, and improved techniques for sampling and analysis, it finds that density is associated with the purpose of walking (travel, leisure) but not the amount of overall walking or overall physical activity, although there are sub-group differences by race/ ethnicity. Overall, higher densities have many benefits in terms of efficient use of infrastructure, housing affordability, energy efficiency and possibly vibrant street life. But higher densities alone, like other built environment features, do not appear to be the silver bullet in the public health campaign to increase physical activity.

Objective To examine neighbourhood food environments, adolescent nutrition and weight status. Design Cross-sectional, observational study. Setting Minneapolis/St. Paul metropolitan region, Minnesota, USA. Subjects A total of 349 adolescents were recruited to the study. Participants completed 24 h dietary recalls and had their weight and height measured. They also reported demographic information and other diet-related behaviours. Geographic Information Systems were used to examine the availability and proximity of food outlets, particularly those captured within the 800, 1600 and/or 3000m network buffers around participants' homes and schools. Results Adjusting for gender, age and socio-economic status, adolescents' sugar-sweetened beverage intake was associated with residential proximity to restaurants (including fast food), convenience stores, grocery stores and other retail facilities within the 800 and/or 1600m residential buffers (P ≤ 0.01). BMI Z-score and percentage body fat were positively associated with the presence of a convenience store within a 1600m buffer. Other individual-level factors, such as energy, fruit and vegetable intake, as well as convenience store and fast food purchasing, were not significantly associated with features of the residential neighbourhood food environment in adjusted models. In addition, school neighbourhood environments yielded few associations with adolescent outcomes. Conclusions Many factors are likely to have an important role in influencing adolescent dietary intake and weight status. Interventions aimed at increasing neighbourhood access to healthy foods, as well as other approaches, are needed.

Do people walk more, or less, depending on the physical character of their residential areas rather than merely their individual characteristics? This paper reports fi ndings for the Twin Cities, Minnesota, about how walking and total physical activity are affected by street pattern, 'pedestrian-oriented' infrastructure and amenities, and mixed use or destinations-in shorthand, design and destinations. The effects of density are dealt with in less depth. Like earlier studies, it fi nds that walking for specifi c purposes (i.e. travel or leisure) varies in relation to the physical characteristics of places. However, this study using multiple measures of overall walking and physical activity suggests that socially similar people do the same total amount of physical activity in different kinds of places and that level of activity is, on average, low.

Parental employment provides many benefits to children's health. However, an increasing number of studies have observed associations between mothers' full-time employment and less healthful family food environments. Few studies have examined other ways in which parental employment may be associated with the family food environment, including the role of fathers' employment and parents' stress balancing work and home obligations. This study utilized data from Project F-EAT, a population-based study of a socio-demographically diverse sample of 3709 parents of adolescents living in a metropolitan area in the Midwestern United States, to examine cross-sectional associations between mothers' and fathers' employment status and parents' work-life stress with multiple aspects of the family food environment. Among parents participating in Project F-EAT, 64% of fathers and 46% of mothers were full-time employed, while 25% of fathers and 37% of mothers were not employed. Results showed that full-time employed mothers reported fewer family meals, less frequent encouragement of their adolescents' healthful eating, lower fruit and vegetable intake, and less time spent on food preparation, compared to part-time and not-employed mothers, after adjusting for socio-demographics. Full-time employed fathers reported significantly fewer hours of food preparation; no other associations were seen between fathers' employment status and characteristics of the family food environment. In contrast, higher work-life stress among both parents was associated with less healthful family food environment characteristics including less frequent family meals and more frequent sugar-sweetened beverage and fast food consumption by parents. Among dual-parent families, taking into account the employment characteristics of the other parent did not substantially alter the relationships between work-life stress and family food environment characteristics. While parental employment is beneficial for many families, identifying policy and programmatic strategies to reduce parents' work-life stress may have positive implications for the family food environment and for the eating patterns and related health outcomes of children and parents.

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