For a variety of reasons, island nations are currently home to the world's fattest people. In some (Nauru, Micronesia, Tonga) over 90% of adults are overweight, and over 70% obese. Though the exact rank of countries by obesity vary, countries in the Levant and Middle East usually follow island nations (Kuwait, Egypt, UAE, Qatar). English speaking countries shouldn't gloat, however, as they tend to have obesity rates of around 30%. The winners? Amongst developed countries East Asia probably takes the cake (well...figuratively at least), with countries reporting rates under 5% (Japan, Korea, China). As for the entire world, the rate is around 13%, equalling around one billion obese people.
Bonus:
In case you were curious, an individual with a Body Mass Index greater than 30 is considered obese (while over 25 is overweight). One's BMI is calculated as:
$BMI = \frac{weight (kg)}{(height (m))^2}$
-E
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