What Is a Serving Size?

 

Instead of trying to memorize lists of ounces, cups, and tablespoons, simply compare the serving sizes of foods to familiar things.
For example, a single serving of:

• Vegetables or fruit is about the size of your fist.
• Pasta is about the size of one scoop of ice cream.
• Meat, fish, or poultry is the size of a deck of cards or the size of your palm (minus the fingers).
• Snacks such as pretzels and chips is about the size of a cupped handful.
• Apple is the size of a baseball.
• Potato is the size of a computer mouse.
• Bagel is the size of a hockey puck.
• Pancake is the size of a CD.
• Steamed rice is the size of a cupcake wrapper.
• Cheese is the size of a pair of dice or the size of your whole thumb (from the tip to the base).

The best way to determine the amount of food in a serving is to look at the Nutrition Facts label and measure it.
source:
http://www.webmd.com/diet/control-portion-size