The study was published in The Lancet ahead of World Obesity Day (11 October).
It analysed weight and height measurements from nearly 130 million people aged over five years (31.5 million people aged five to 19,
and 97.4 million aged 20 and older), making it the largest ever number of participants involved in an epidemiological study. More than 1000 contributors participated in the study,
which looked at body mass index (BMI) and how obesity has changed worldwide from 1975 to 2016.