This paper provides a theoretical and empirical examination of the long-run growth in weight over time. We argue that technological change has induced weight growth by making home- and market-production more sedentary and by lowering food prices through agricultural innovation. We analyze how such technological change leads to unexpected relationships among income, food prices, and weight. Using individual-level data from 1976 to 1994, we then find that such technology-based reductions in food prices and job-related exercise have had significant impacts on weight across time and populations. In particular, we find that about forty percent of the recent growth in weight seems to be due to agricultural innovation that has lowered food prices, while sixty percent may be due to demand factors such as declining physical activity from technological changes in home and market production.

Citerank: (21) 348675Adopt a whole systems approach to obesityTackling obesity effectively—accomplishing a population wide-shift—requires a comprehensive and integrated whole systems approach, involving a range of measures focusing on individuals, social and other systems, including at the local and community level, and on the interrelated physical, physiological, social and cognitive factors that determine health outcomes.565CA4D9, 348693Stakeholders – Groups & ActionsExplore the map via the different stakeholder groups and the measures each group can take to help tackle the obesity crisis.58D3ABAB, 348702Individuals and FamiliesThe actions and choices of individuals and families are fundamental to the challenge of tackling obesity. 84E4A378, 348703Actions – Industry2794CAE1, 348780Causes of obesityUnderstanding the causes of obesity is critical to the success of prevention and treatment strategies. However, while (simply put) obesity occurs when energy intake from food and drink consumption is greater than energy expenditure through the body’s metabolism and physical activity over a prolonged period (resulting in the accumulation of excess body fat), in reality many complex behavioural and societal factors contribute systemically to the current crisis and no single influence dominates.555CD992, 352281Changes required across many different policy areasObesity has to be seen as not just a technical, food, physical activity or healthcare problem but a challenge for what sort of society is being built. Small, incremental, publicity-driven (i.e. social market-based) changes might suit the existing balance of policy interests, but a more extensive, co-ordinated, cross-sectoral action would be more effective.1198CE71, 352314Actions – Central Government2794CAE1, 352388Advertising and marketing reinforce new eating patterns Marketing and advertising instil and reinforce new cultural norms about what (e.g. fast food) and how to eat (e.g. snacking), and how much (e.g. larger portions) to eat.555CD992, 352389Reluctance to talk about and address implications of own weightThe weight of the population continues to rise despite media imagery of thin models encouraging a slim ideal that is far out of reach for most of the public. In this context, “Fat” remains an emotive and stigmatic subject – and often perceived as an insult – which makes it harder for people to acknowledge, confront and address their own obesity (and harder for others including health professionals to encourage them to do so too).555CD992, 352391Industrial development changes what and how people eatEconomic and industrial development has tended to be accompanied by a historic shift in patterns of food consumption from diets high in cereal and fibre to diets high in sugars, fat, animal-source food and highly-processed foods – creating a socio-cultural environment in which obesity is more likely to emerge in the population.555CD992, 352399Successive governments have made counterproductive policy choicesThe growing prevalence of obesity in the UK is partly the result of well-intentioned but counterproductive policy choices made by successive governments over several decades.555CD992, 352400Many individuals are consuming more energy than they are expendingPublic Health England estimates that the average man in England is consuming around 300 calories a day more than they would need were they a healthy body weight.555CD992, 399547Adopt a whole systems approach to obesityTackling obesity effectively—accomplishing a population wide-shift—requires a comprehensive and integrated whole systems approach, involving a range of measures focusing on individuals, social and other systems, including at the local and community level, and on the interrelated physical, physiological, social and cognitive factors that determine health outcomes.565CA4D9, 399558Changes required across many different policy areasObesity has to be seen as not just a technical, food, physical activity or healthcare problem but a challenge for what sort of society is being built. Small, incremental, publicity-driven (i.e. social market-based) changes might suit the existing balance of policy interests, but a more extensive, co-ordinated, cross-sectoral action would be more effective.1198CE71, 399887Causes of obesityUnderstanding the causes of obesity is critical to the success of prevention and treatment strategies. However, while (simply put) obesity occurs when energy intake from food and drink consumption is greater than energy expenditure through the body’s metabolism and physical activity over a prolonged period (resulting in the accumulation of excess body fat), in reality many complex behavioural and societal factors contribute systemically to the current crisis and no single influence dominates.555CD992, 399890Successive governments have made counterproductive policy choicesThe growing prevalence of obesity in the UK is partly the result of well-intentioned but counterproductive policy choices made by successive governments over several decades.555CD992, 399891Many individuals are consuming more energy than they are expendingPublic Health England estimates that the average man in England is consuming around 300 calories a day more than they would need were they a healthy body weight.555CD992, 399896Industrial development changes what and how people eatEconomic and industrial development has tended to be accompanied by a historic shift in patterns of food consumption from diets high in cereal and fibre to diets high in sugars, fat, animal-source food and highly-processed foods – creating a socio-cultural environment in which obesity is more likely to emerge in the population.555CD992, 399907Reluctance to talk about and address implications of own weightThe weight of the population continues to rise despite media imagery of thin models encouraging a slim ideal that is far out of reach for most of the public. In this context, “Fat” remains an emotive and stigmatic subject – and often perceived as an insult – which makes it harder for people to acknowledge, confront and address their own obesity (and harder for others including health professionals to encourage them to do so too).555CD992, 399917Advertising and marketing reinforce new eating patterns Marketing and advertising instil and reinforce new cultural norms about what (e.g. fast food) and how to eat (e.g. snacking), and how much (e.g. larger portions) to eat.555CD992, 399923Previous physical activities replaced by industrially generated energyIndustrial development allows many different aspects of life that previously involved daily physical activity to be accomplished through industrially generated energy instead; for example, the substitution of motorised transport for walking and cycling, a shift from manual and agricultural work towards office work, and a multitude of labour saving devices at work and in the home.555CD992

> Background: Rising rates of overweight children have focused attention on walking and biking to school as a means to increase children’s physical activity levels. Despite this attention, there has been little documentation of trends in school travel over the past 30 years or analysis of what has caused the changes in mode choice for school trips.

> Methods: This article analyzes data from the 1969, 1977, 1983, 1990, 1995, and 2001 National Personal Transportation Survey conducted by the U.S. Department of Transportation to document the proportion of students actively commuting to school in aggregate and by subgroups and analyze the relative influence of trip, child, and household characteristics across survey years. All analyses were done in 2006.

> Results: The National Personal Transportation Survey data show that in 1969, 40.7% (95% confidence interval [CI]=37.9–43.5) of students walked or biked to school; by 2001, the proportion was 12.9% (95% CI=11.8–13.9). Distance to school has increased over time and may account for half of the decline in active transportation to school. It also has the strongest influence on the decision to walk or bike across survey years.

> Conclusions: Declining rates of active transportation among school travelers represents a worrisome loss of physical activity. Policymakers should continue to support programs designed to encourage children to walk to school such as Safe Routes to School and the Centers for Disease Control and Prevention’s KidsWalk. In addition, officials need to design policies that encourage schools to be placed within neighborhoods to ensure that the distance to school is not beyond an acceptable walking distance.

A summary of labour market conditions in the twentieth
century.