According to WHO data, worldwide, more than 1·9 billionadults are overweight—of these over 650 million areobese. 41 million children under the age of 5 years and340 million children and adolescents aged 5–19 yearsare overweight or obese. Obesity is a major risk factorfor non-communicable diseases, such as cardiovasculardisease, diabetes, and several cancers. Crucially, obesity ispreventable. So how is it that obesity has nearly tripledworldwide since 1975?
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