The accompanying four papers in The Lancet address several crucial areas relevant to the impact and future course of the obesity epidemic. In the past 30 years, obesity has increased in most countries and regions of the world. Boyd Swinburn and colleagues emphasise that obesity control will require policy interventions to improve the environments that promote poor dietary intake and physical inactivity rather than individually focused interventions, and that the necessary policy changes are fraught with political challenges not associated with clinical interventions that focus on individuals.
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