Featured Research

from universities, journals, and other organizations

Portion Size Matters: Given Too Much, We Eat It

Date:
December 4, 2002
Source:
Penn State
Summary:
Almost nobody can stop eating at just one normal serving if there's extra food on their plate, Penn State researchers have shown, and this tendency coupled with the spread of megaportions may be contributing to the American obesity epidemic.

Almost nobody can stop eating at just one normal serving if there's extra food on their plate, Penn State researchers have shown, and this tendency coupled with the spread of megaportions may be contributing to the American obesity epidemic.

In the first systematic, controlled study of the response to portion size in adults, the researchers found that the bigger the portion, the more the participants ate. On average, they ate 30 percent more from a five-cup portion of macaroni and cheese than from one half its size – without reporting feeling any fuller after eating. Dr. Barbara Rolls, who holds the Guthrie Chair of Nutrition in Penn State's College of Health and Human Development, led the study. She says, "Men and women, normal-weight and overweight individuals, restrained and unrestrained eaters, all responded to larger portion size by eating more."

The response to larger portions was not influenced by who determined the amount of food on the plate, the study participant or the researchers.

The study is detailed in a paper, "Portion Size of Food Affects Energy Intake in Normal-weight and Overweight Men and Women," in the current (December) issue of the American Journal of Clinical Nutrition. Rolls's co-authors are Erin L. Morris, Penn State master's degree recipient in nutrition, and Liane S. Roe, research nutritionist.

In the study, 51 normal-weight and overweight men and women, 21 to 30 years of age, had lunch one day a week for four weeks in Penn State's Laboratory for the Study of Human Ingestive Behavior. The lunch included water, carrot sticks and a snack-size chocolate bar as well as macaroni and cheese made in the "light" version from a well-known commercial mix.

Each week, the participants were served the macaroni and cheese in one of four portions ranging from two and a half to five cups. The participants were required to eat all of the carrots and chocolate bar but could eat as little or as much of the macaroni and cheese as they wanted.

One group received the different amounts of macaroni and cheese pre-portioned on a dinner plate from which they ate. Another group received the different portions in a serving dish and could scoop as much of the entrιe as they liked onto their plates. In both cases, the participants ate more when more food was available but didn't report feeling any fuller after eating.

Rolls says, "Our research shows that pretty much everyone is susceptible to the influence of portion size. However, it's not increased portion size alone that is contributing to the American obesity epidemic but rather eating large portions of high-calorie, high-fat foods.

"Large portions of foods low in calories and fat such as vegetables, fruits and broth-based soups can aid weight management by providing satisfying portions with few calories," she adds.

Her strategy is described in detail in her best-selling book, "The Volumetrics Weight-Control Plan," to be published soon in a new low-cost paperback edition by Avon.


Story Source:

The above story is based on materials provided by Penn State. Note: Materials may be edited for content and length.


Cite This Page:

Penn State. "Portion Size Matters: Given Too Much, We Eat It." ScienceDaily. ScienceDaily, 4 December 2002. <www.sciencedaily.com/releases/2002/12/021204081430.htm>.
Penn State. (2002, December 4). Portion Size Matters: Given Too Much, We Eat It. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2002/12/021204081430.htm
Penn State. "Portion Size Matters: Given Too Much, We Eat It." ScienceDaily. www.sciencedaily.com/releases/2002/12/021204081430.htm (accessed July 25, 2014).

Share This




More Mind & Brain News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

University Quiz Implies Atheists Are Smarter Than Christians

University Quiz Implies Atheists Are Smarter Than Christians

Newsy (July 25, 2014) — An online quiz from a required course at Ohio State is making waves for suggesting atheists are inherently smarter than Christians. Video provided by Newsy
Powered by NewsLook.com
Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

AFP (July 24, 2014) — A so-called drugs rehab 'clinic' is closed down in Pakistan after police find scores of ‘patients’ chained up alleging serial abuse. Duration 03:05 Video provided by AFP
Powered by NewsLook.com
New Painkiller Designed To Discourage Abuse: Will It Work?

New Painkiller Designed To Discourage Abuse: Will It Work?

Newsy (July 24, 2014) — The FDA approved Targiniq ER on Wednesday, a painkiller designed to keep users from abusing it. Like any new medication, however, it has doubters. Video provided by Newsy
Powered by NewsLook.com
Can Watching TV Make You Feel Like A Failure?

Can Watching TV Make You Feel Like A Failure?

Newsy (July 24, 2014) — A study by German researchers claims watching TV while you're stressed out can make you feel guilty and like a failure. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins