Big Mac fans need to cycle for this length of time to burn the calories

Calorie-laden snacks refresh the parts that other food fails to reach – but how many of us feel so guilty afterwards that we put ourselves through an exercise regime?

But estimating how much time it takes to burn off the carbs after tucking into a Big Mac or a Greggs sausage roll is where we fall wide of the mark.

The majority of people  think it takes as little as 15 minutes cycling to get rid of the 452 calories in an average doughnut – but the true figure is 40mins, almost three times as long.

And they kid themselves it takes as little as 60mins to work off a medium Domino’s pepperoni pizza, whereas that has 2,478 calories and actually takes over three hours on the bike to work off.