Now take a look at the cinnamon bun example: Cinnamon buns seduce us with their fragrance — a fragrance that almost reaches out and begs us to eat them when we're shopping or traveling. While they're easy to get and eat, they're not so easy to burn off.
One Cinnamon Bun with Icing: 620–846 calories
Walking: 160–218 minutes
Biking: 88–120 minutes
Running: 66–90 minutes
Source: Diet Detective
By the way, a typical fast food meal (burger, fries, and soda) is about 1,300 calories. So, to "burn that puppy off" would take about 2-hours. Again, it's impossible to exercise off the standard American diet (SAD).