Remember that a portion size is the amount of a single food item served in a single eating occasion, normally a meal or a snack. People often confuse portion size with serving size, which is a standard unit of measuring foods (a cup or an ounce are good examples). Portion size is the amount offered in the packaging of prepared foods, or the amount a person chooses to put on his or her plate.
For example, bagels or muffins are often sold in sizes that constitute at least 2 servings, but consumers often eat the whole thing, thinking that they have eaten 1 serving. They do not realize that they have selected a large portion size that was more than 1 serving. Portion sizes have increased over time, so make sure you check the serving size on the label.
