I don't know the percentages, but yes, obesity is high particularly in the U.S.

Health experts are actually now considering obesity to be an epidemic in the U.S. Lot of fat kids around, and it isn't getting better with the fast food restaurants and the video games. Children need at least 60 minutes of physical activity per day.

Currently, 64.5 percent of U.S. adults, age 20 years and older, are overweight and 30.5 percent are obese. Severe obesity prevalence is now 4.7 percent, up from 2.9 percent reported in the 1988 - 1994 National Health and Nutrition Examination Survey (NHANES) by the Centers for Disease Control and Prevention (CDC).

I think it's just going to get higher and higher.. there's nothing stopping it. You have people against it but you have alot more people that just don't care. "Let's go eat at McDonalds for breakfast since it's fast." Doughnuts.. whatever. There is so much good food that is bad for you in the US .. Not a bad thing lol... For some numbers

Approximately 127 million adults in the U.S. are overweight, 60 million obese, and 9 million severely obese.

As of 2007 there were 301,139,947 people in the US...