To know what a portion size looks like, think about the following:
Baseball — a serving of vegetables or fruit is about the size of your fist about one half cup cooked or raw veggies or cut fruit, a piece of fruit, or ½ cup of cooked rice or pasta — this is also a good measure for a snack serving, such as chips or pretzels
Deck of cards — a serving of meat, fish or poultry or the palm of your hand (don't count your fingers!) — for example, one chicken breast, ¼ pound hamburger patty or a medium pork chop
Golf ball or large egg — one quarter cup of dried fruit or nuts
Tennis ball — about one half cup of ice cream
CD — about the size of one serving of pancake or small waffle
Thumb tip — about one teaspoon of peanut butter