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Going out to eat -- be it breakfast, lunch or dinner -- can be an exercise in will power. No matter what the server brings, you can almost bet that what's on your plate will be at least two to three portions worth. Sure, we all want to get the most food for our buck, but that doesn't mean falling off the wagon by licking the plate clean. To arm yourself, you need get your portion sizes down. For example, one serving of steak is no bigger than a deck of cards, and one 3-inch pancake out of the stack will do it for breakfast (here's a diet-friendly trick: Top it with fresh fruit). Find out more about portion size here and then take this quiz to check your portion IQ.

Find out how even "The Joy of Cooking" is working against portion control.