This news item expired on 6/30/2013, so the information below could be outdated or incorrect.
Measure Up: How Much Do You Eat?
Here is a handy way to measure portion sizes:
3 ounces of meat = deck of cards
1 teaspoon of oil = quarter in diameter
1 cup of raw vegetables = light bulb
1 medium fresh fruit = tennis ball
1 bagel or roll = 6 ounce can of tuna