BMI is useful for governments who want to know about the health of their people. For example, in the United States in 2007, 74% of adults had a BMI above 25 ("Overweight" or "Obese") and 27% of adults had a BMI above 30 ("Obese"). Many of these people will become ill because they are too fat. This information helps the United States government decide what to do about the health of its people.