Obesity caused by what you breathe?

Diabetes. Asthma. Obesity. All are on the rise. What if they're all caused by the same thing?

At least one study found that air pollution — known to contribute to asthma — also spurs both obesity and diabetes in young mice, suggesting that it may also contribute to the ubiquitous problems in humans.

Ohio State researchers found that young mice exposed to air pollution had larger and more fat cells in their abdominal area and higher blood sugar levels than mice eating the same diet but breathing clean air...