[chemgear]

By the numbers:

http://www.sciencedaily.com/releases...0409103247.htm
http://www.sciencedaily.com/releases...0403124252.htm
http://www.cdc.gov/nchs/fastats/overwt.htm/

For 2007-2008: Percent of adults age 20 years and over who are obese: 33.9%. Percent of adults age 20 years and over who are overweight (and not obese): 34.4%

Mathematically leaves 31.7% that are not overweight - this number is most likely shrinking in 2012.

Obesity adds more to health care costs than smoking does
Obesity now accounts for almost 21 percent of U.S. health care costs