Most people consume far more calories than they realize. The culprit? A warped sense of portion size.
Did you know that a portion size is different than a serving size? If not, you are not alone. Since the mid-1980's, portion sizes have grown. This means Americans eat more calories than we need without realizing it. One way to bring yourself back to a healthy weight is to manage your calorie intake. The US Department of Agriculture recommends that you enjoy your food, but eat less. By doing so, you will not have to completely eliminate foods you like. You will just have to control portion sizes.
Experts say that understanding the concept of standard serving sizes is essential to good nutrition. Standardized serving sizes help consumers, health professionals, and food manufacturers find a common language for the sake of communication.
Although serving sizes are standardized, individual portion sizes will vary because people have different caloric requirements. Portion size also depends on a person's specific weight management goals and health needs. For example, pregnant and breastfeeding women may require larger portions of food than do women who are not pregnant or nursing.
Portion sizes and overall dietary requirements depend on several factors, including activity level. For example, an inactive person may only need ¾-1 cup of cereal in the morning, which is the usual serving size of most varieties. But someone who runs several miles a day or who engages in other forms of aerobic exercise may need 2-3 standard serving sizes.
To help determine a standard serving size, measure out what is listed on the "Nutrition Facts" food label.
What is a portion size? Try following these models to approximate portion sizes:
If you are unsure about your personal nutrition requirements, go to the Choose My Plate website to get eating recommendations based on factors like your age, sex, and activity level. For an even more individualized plan and for motivation, seek the advice of a registered dietitian. These professionals can create individual menus and food plans that are suited to your specific weight management and overall health goals.
Choose My Plate—US Department of Agriculture
Eat Right—Academy of Nutrition and Dietetics
Dietitians of Canada
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Last reviewed February 2017 by Michael Woods, MD, FAAP
Last Updated: 2/3/2017