The Energy Balance

For a 200lb (14st or 90kg) person the energy burned per hour in kcal on the following activities is

Sleeping 82
Standing 106
Walking (3 mph) 388
Driving 3 *
Billiards 223
Housework 259
Sex (missionary) 376
Swimming 541
Cycling 350
Playing football 894
* not counting background calorie loss

Compare this with the calories in some foods

McD quarter pounder 500
McD fries 224
Pint coke 420
Dominoes Pizza (12") >2000
Pint beer 180
Glass Red Wine 80
Cup tea (milk & sugar) 30
1 chocolate digestive 90
1 mouthful donner kebab 42

So if you walk for about 3 hours each way to fetch your pizza you'll have earned it.