One problem with those numbers is the questionable definition of being overweight.
The most popular definition, as used by the WHO, Wii Fit and others, is that a person is overweight or obese if his Body Mass Index is 25.0 or greater, no matter his gender or body stature.
But this definition has a number of shortcomings. For example athletes, bodybuilders etc. generally tend to have a high BMI even though nobody would consider them fat. When Arnold Schwarzenegger won the title of being "Mister Universe" in 1969, his Body Mass Index was greater than 30, making him officially "obese". Ronnie Coleman, who won the the Mr. Olympia contest 8 years in a row, even had a BMI of 41.
Definitions that much better correlate with the common definition of "being fat" would be bodyfat percentage or waist-to-height ratio.
