[bo1024]

That quote is deceptive. An hour's jogging will burn at least 500 calories even for quite small people going quite slow, perhaps 700-800 for larger or faster ones. That would be a massive muffin and significantly more than 20% of an average calorie consumption.

[ac29]

Muffins can have quite a lot of calories. The (admittedly fairly large) ones at Costco are over 600 calories: http://www.myfitnesspal.com/food/calories/kirkland-costco-bl...

[bo1024]

Okay, but not a small amount of food as they describe/imply.