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
6 tips for dining out without blowing your nutrition plan. Eat Right—Academy of Nutrition and Dietetics website. Available at: http://www.eatright.org/resource/health/weight-loss/eating-out/6-tips-for-dining-out-without-blowing-your-nutrition-plan. Updated October 30, 2015. Accessed February 3, 2017.
Diets for weight loss. EBSCO DynaMed Plus website. Available at: http://www.dynamed.com/topics/dmp~AN~T316887/Diets-for-weight-loss. Updated January 30, 2017. Accessed February 3, 2017.
Dietary guidelines for Americans 2015-2020. Office of Disease Prevention and Health Promotion website. Available at: https://health.gov/dietaryguidelines/2015/guidelines. Updated December 2015. Accessed February 3, 2017.
Estimating portion sizes. University of Arkansas Division of Agriculture website. Available at: http://www.uaex.edu/health-living/food-nutrition/docs/Estimating%20Portion%20Sizes.pdf. Accessed February 3, 2017.
How to avoid portion size pitfalls to help manage your diet. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/healthyweight/healthy_eating/portion_size.html. Updated July 6, 2016. Accessed February 3, 2017.
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Kesman RL, Ebbert JO, Harris KI, Schroeder DR. Portion control for the treatment of obesity in the primary care setting. BMC Res Notes. 2011;4:346.
Sacks FM, Bray GA, Carey VJ, et al. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates. N Engl J Med. 2009;360(9):859-873.
Last reviewed February 2017 by Michael Woods, MD, FAAP
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.