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[Comment] A fatter, healthier but more unequal world

Lancet readers know that the world’s population is getting heavier, but the detail in the latest overview of global trends in mean body-mass index (BMI) and the proportion of individuals classified as overweight and obese remains striking.1 In their pooled analysis of 1698 population-based studies, with more than 19 million participants representing most countries, the NCD Risk Factor Collaboration found that between 1975 and 2014 the mean age-corrected BMI increased from 21·7 kg/m2 to 24·2 kg/m2 in men and from 22·1 kg/m2 to 24·4 kg/m2 in women.