If you're on a diet and celebrating the mid-autumn festival this week by tucking into a moon cake, have your pedometer at the ready: it's going to take you 2.4 hours - or 16,000 steps - to work off the calories.
That's according to the maths of Canadian-based doctor and pedometer expert Martin Collis, who's drawn up a table of how many calories certain foods contain and how long it takes to walk them off.