Switching to public transport or cycling/walking to get to work might help shed the pounds: "Switching from a car to walking, cycling, or public transport was associated with a statistically significant average reduction in BMI of 0.32 kg/m2 after taking account of other influential factors—equivalent to a difference of around 1 kg a person, on average.
The longer the commute, the stronger was the association, with a reduction in BMI of 0.75 kg/m2 (equivalent to a weight loss of around 2 kg) associated with journeys of more than 10 minutes, and 2.25 kg/m2 associated with journeys of more than 30 minutes—equivalent to weight loss of around 7 kg, on average."
