A recent study shows that obesity costs Americans close to US$4 billion ($3.9 billion) in extra fuel every year.
Reuters reported cars in the States are burning one billion gallons (3.8 billion liters) of fuel annually more than they would if their drivers weighed what the average person did in 1960, due to the increased number of people becoming overweight or obese and the rising fuel prices.
The Atlantic reports that for each extra pound of passenger weight, the US burns through another 39 million gallons of fuel annually. This means an extra 325 million liters of fuel for each additional kilogram of passenger weight. Another change is the fact that cars have been forced to become larger, this means heavier and less fuel efficient.
At the beginning of this year some experts predicted that by 2015 more than half of the U.S. population will be obese and that additional fuel use will climb even higher in the coming years.