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According to WHO data, worldwide, more than 1·9 billion adults are overweight—of these over 650 million are obese. 41 million children under the age of 5 years and 340 million children and adolescents aged 5–19 years are overweight or obese. Obesity is a major risk factor for non-communicable diseases, such as cardiovascular disease, diabetes, and several cancers. Crucially, obesity is preventable. So how is it that obesity has nearly tripled worldwide since 1975?
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The Lancet Public Health (2018) studied this question.
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