Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

After overeating, we don’t compensate by eating less

16.08.2005


If you binged for two weeks while on vacation and gained 5 pounds, would you be biologically primed to eat less to compensate and shake off the excess weight? No, suggests a new Cornell University study.

When a group of 12 normal-weight men and women, average age 31, agreed to overeat by 35 percent for two weeks, they gained an average of 5 pounds, half of it body fat. When they were permitted to return to their normal eating behavior, they did not spontaneously cut back on their normal food intake, even after the two weeks of "feeling stuffed." Rather, they ate just as much as they did before the overeating period, as measured by the researchers during the two weeks before their binge began.

"The study suggests that eating behavior does not normally respond to internal cues, such as physiological mechanisms involved in the regulation of body weight, but to external cues," said David Levitsky, professor of nutritional sciences and of psychology at Cornell. "In other words, when the subjects returned to the same environment -- in this case our eating lab -- they returned to their same eating patterns, regardless of any biological signals."



The results add to the growing evidence that environmental cues, especially portion size, appear to be a major determinant of how much we eat, he said. This finding runs counter to the current view that food intake is largely determined by biological mechanisms.

The study is published in Physiology and Behavior (Vol. 84 (5), pp. 669-675) and was co-authored by Eva Obarzanek, a nutritionist for the National Heart, Lung and Blood Institute of the National Institutes of Health, Gordana Mrdjenovic, Cornell Ph.D. ’00, and Barbara Strupp, associate professor of nutritional sciences at Cornell.

Despite not eating less or exercising more after gaining weight, the participants still lost about half of their weight gain in the three weeks after the overeating phase because their metabolic rate spontaneously increased. "You burn more energy simply by carrying around additional weight," Levitsky said. "The spontaneous increase in metabolic rate that we found in the subjects after overeating was remarkably consistent with a comparable overfeeding study in animals, as well as with other studies with humans and overeating."

He plans to conduct a study in the fall to examine how much additional energy is expended when carrying around extra weight. It is well known, he said, that obese people have higher energy expenditures than nonobese people, and his study is an example of weight being regulated passively without any control of food intake.

Levitsky has been exploring predictors of food intake for several years. A number of his previous studies found that the amount animals and people eat is strongly determined by portion size, and that eating between meals, or eating a very large or very small (or no) previous meal does not influence how much is eaten at the next meal.

"Consistently, we find that how much people eat is in direct relation to how much they are served, the variety of foods offered and the number of people with whom they eat," Levitsky said.

Nicola Pytell | EurekAlert!
Further information:
http://www.cornell.edu

More articles from Studies and Analyses:

nachricht Researchers simplify tiny structures' construction drip by drip
12.11.2018 | Princeton University, Engineering School

nachricht Mandibular movement monitoring may help improve oral sleep apnea devices
06.11.2018 | Elsevier

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: UNH scientists help provide first-ever views of elusive energy explosion

Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.

Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...

Im Focus: A Chip with Blood Vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...

Im Focus: A Leap Into Quantum Technology

Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.

In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...

Im Focus: Research icebreaker Polarstern begins the Antarctic season

What does it look like below the ice shelf of the calved massive iceberg A68?

On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.

Im Focus: Penn engineers develop ultrathin, ultralight 'nanocardboard'

When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure

Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“3rd Conference on Laser Polishing – LaP 2018” Attracts International Experts and Users

09.11.2018 | Event News

On the brain’s ability to find the right direction

06.11.2018 | Event News

European Space Talks: Weltraumschrott – eine Gefahr für die Gesellschaft?

23.10.2018 | Event News

 
Latest News

Purdue cancer identity technology makes it easier to find a tumor's 'address'

16.11.2018 | Health and Medicine

Good preparation is half the digestion

16.11.2018 | Life Sciences

Microscope measures muscle weakness

16.11.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>