By Rhiannon Mills, Sky News Correspondent
Global efforts to tackle obesity have been "unacceptably slow" with no country to date reversing the trend, according to a major new study.
The six-part series published in The Lancet looks at how countries around the world are dealing with an increasing obesity epidemic, focusing on a range of issues from quality of diet to how children can be encouraged to eat healthier food.
It is estimated that 600 million people worldwide are obese, with 2.1 billion now overweight. Being overweight is believed to cause the deaths of 2.8 million people every year.
One of the authors, Dr Christina Roberto, from the Harvard T H Chan School of Public Health, explained: "Our understanding of obesity must be completely reframed if we are to halt and reverse the global obesity epidemic.
"On one hand, we need to acknowledge that individuals bear some responsibility for their health and on the other hand recognise that today's food environments exploit people's biological, psychological and social and economic vulnerabilities."
In some countries, including the UK, childhood obesity numbers have levelled off, but so far no country has reversed its obesity epidemic.
Experts are now calling for a worldwide action plan including restrictions on how food aimed at children is marketed.
They also want regulation of food nutritional quality and availability in schools, better labelling with nutritional values and taxes on drinks that are high in sugar.
Corinna Hawkes, of the World Cancer Research Fund International, told Sky News: "People start to learn what foods they like, the foods that they prefer, in fact before birth, and every interaction they have with the world influences what they like to eat.
"Policy makers need to understand that and design policies that take it into account."
The studies claim that barriers to action have included lobbying from the food and restaurant industry, restricted ability or unwillingness of governments to implement policies and a lack of pressure from the public.
The journal also includes the first study to assess diet quality in 187 countries covering almost 4.5 billion adults.
It found consumption of healthy foods has improved, but has been outpaced by people eating more unhealthy foods - so some of the wealthiest regions still have among the lowest quality diets in the world.
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