From Yahoo! News:
People who drive long distances to work are more likely to be overweight and have poorer fitness levels than people who live closer to their jobs, a US study said Tuesday.
The study in the American Journal of Preventive Medicine was based on data from nearly 4,300 people in Texas near the major metropolitan hubs of Dallas-Fort Worth — one of the top five most congested areas in the United States — and nearby Austin.
People who drove longer distances to work were found generally to have larger waist circumferences, lower cardiovascular fitness levels, higher blood pressure and higher body-mass index.