Childhood obesity, is fast food exposure a factor?

Access to fast food has often been blamed for the rise in obesity which in turn has motivated policies to curb the spread of fast food. However, robust evidence in this area is scarce, particularly using data outside of the US. It is difficult to estimate a causal effect of fast food given spatial sorting and ever-present exposure. We investigate whether the residential access to fast food increased BMI of adolescents at a time when fast food restaurants started to open in the UK. The time period presents the study with large spatial and temporal differences in exposure as well as plausibly exogenous variation. We merge data on the location and timing of the first openings of all fast food outlets in the UK from 1968-1986, with data on objectively measured BMI from the 1970 British Cohort Survey. The relationship between adolescent BMI and the distance from the respondents' homes and time since opening, is studied using OLS and Instrumental Variables regression. We find that fast food exposure had no effect on BMI. Extensive robustness checks do not change our conclusion.

The intergenerational transmission of body mass index across countries.

There is a worldwide epidemic of obesity. We are just beginning to understand its consequences for child obesity. This paper addresses one important component of the crisis; namely the extent to which adiposity, or more specifically, BMI, is passed down from one generation to the next. We find that the intergenerational elasticity of BMI is very similar across countries and relatively constant - at 0.2 per parent. Our substantive finding is that this elasticity is very comparable across time and countries - even if these countries are at very different stages of economic development. Quantile analysis suggests that this intergenerational transmission mechanism is substantively different across the distribution of children's BMI; more than double for the most obese children what it is for the thinnest children. These findings have important consequences for the health of the world's children.1.

Can increased primary care access reduce demand for emergency care? Evidence from England's 7-day GP opening.

Restricted access to primary care can lead to avoidable, excessive use of expensive emergency care. Since 2013, partly to alleviate overcrowding at the Accident & Emergency (A&E) units of hospitals, the UK has been piloting 7-day opening of General Practitioner (GP) practices to improve primary care access for patients. We evaluate the impact of these pilots on patient attendances at A&E. We estimate that 7-day GP opening has reduced A&E attendances by patients of pilot practices by 9.9% with most of the impact on weekends which see A&E attendances fall by 17.9%. The effect is non-monotonic in case severity with most of the fall occurring in cases of moderate severity. An additional finding is that there is also a 9.9% fall in weekend hospital admissions (from A&E) which is entirely driven by a fall in admissions of elderly patients. The impact on A&E attendances appears to be bigger among wealthier patients. We present evidence in support of a causal interpretation of our results and discuss policy implications.

The intergenerational transmission of BMI in China.

Based on the China Health and Nutrition Survey longitudinal data from 1989 to 2009 and using BMI z-score as the measure of adiposity, we estimate the intergenerational transmission of BMI in China. The OLS estimates suggest that a one standard deviation increase in father's or mother's BMI is associated with an increase of around 20% in child's Body Mass Index (BMI) z-score. These estimates decrease to around 14% when we control for family fixed effects. We examine the heterogeneity of this BMI intergenerational transmission process across family income, parental occupation and poverty status and also find this intergenerational correlation tends to be higher among children of higher BMI levels, though this tendency becomes weaker as children approach adulthood.

Get a Life? The Impact of the European Working Time Directive: The Case of UK Senior Doctors.

This paper seeks to identify the effect of the implementation of the European Working Time Directive on the working hours of UK doctors. The Labour Force Survey is used to compare the working hours of doctors with a variety of control groups before and after the implementation of the directive. The controls include those unconstrained by the directive and doctor counterparts working in Europe. We use differences-in-differences and matching methods to estimate the impact of this natural experiment, distinguishing between the anticipation and enactment of the European Working Time Directive. We find that the legislation reduced the hours of senior doctors by around 8 hours in total including the component attributable to anticipation effects and allowing for (exogenously set) rising wages. Copyright © 2014 John Wiley & Sons, Ltd.