In the land of skinny jeans, the thin man is king. A new study by the Institute for Health Metrics and Evaluation at the University of Washington found that in 2011 (the year studied), men in San Francisco county had the lowest rate of obesity in the nation. S.F.'s 18.3% male obesity trumped second place New York's 19.1%. (For comparison's sake, Owsley, Kentucky has the most obesity among men, at 46.9%.)

The ladies also made a strong showing, with San Francisco and Marin county women coming in 7th and 9th on the "least obese" list, among a cluster of Colorado counties (land of polar fleece). Actually, Marin women came in almost annoyingly high, scoring both the second most active and the longest life expectancy (85 years). San Francisco and San Mateo woman, as well as men in Marin and both genders in Santa Clara county, also landed in the top 10 for life expectancy.

While San Francisco county men were skinniest, they didn't figure in the top 10 "most active" list, pointing to diet and general lifestyle as the cause instead of hardcore calorie-burning (Paleo diet, anyone?).