What explains increasing obesity? Theory 4:Changing lifestyles 。 Sedentary Jobs:The labor economy in the developed world, which previously consisted largely of agricultural jobs,has become dominated by service and manufacturing jobs, which require less physical activity. Heating and AC:Bodies expend energy to cope with hot and cold temperatures,so air conditioning and central heating may be contributing to fat staying on bodies rather than being burned off. Automobile use:The automobile is credited with dramatically reducing average daily walking exercise in developed countries. Bhattacharya,Hyde and Tu-HealthEconomicsBhattacharya, Hyde and Tu – Health Economics What explains increasing obesity? • Theory 4: Changing lifestyles • Sedentary Jobs: The labor economy in the developed world, which previously consisted largely of agricultural jobs, has become dominated by service and manufacturing jobs, which require less physical activity. • Heating and AC: Bodies expend energy to cope with hot and cold temperatures, so air conditioning and central heating may be contributing to fat staying on bodies rather than being burned off. • Automobile use: The automobile is credited with dramatically reducing average daily walking exercise in developed countries