The number of people worldwide with a BMI of 30 or above is currently thought to exceed 250 million, i.e. 7% of the world's adult population (Table 1.5) (4). When individual countries are considered, the range of obesity prevalence covers almost the full spectrum, from below 5% in China, Japan and certain African nations to more than 75% in urban Samoa. It is difficult to calculate an exact global figure because good quality and comparable data are not widely available. The assessment in Table 1.5 is a conservative estimate.
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