The standard portion of a serving of meat is 3 ounces. This can include turkey, chicken, and fish. A deck of card is 3 ounces so that is great way to remember how much you should have during each meal. This way you can visualize the deck of cards and use that as a template for your serving if you don't have a scale. Even if you don't have a deck of cards, almost everyone knows what they look like and the size, so they can base the serving off of the memory.
