Barbara Jean Rolls

Professor and Helen A. Guthrie Chair of Nutritional Sciences; Professor of Biobehavioral Health

Barbara Jean Rolls

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Food Weights And Measures Obesity Weight Loss Portion Size Preschool Children Energy Intake Meals Low Energy Food Research Energy Density Child Low Energy Density Energy Palatability Maintenance Diet Body Weight Vegetables Nutrition Lunch Eating Milk Behavioral Sciences Biological Marker

Most Recent Publications

Switching between foods is reliably associated with intake across eating events in children

N. V. Neuwald, Alaina Pearce, P. M. Cunningham, L. Koczwara, M. N. Setzenfand, B. J. Rolls, Kathleen Loralee Keller, 2024, Appetite

Child eating behaviors are consistently linked to intake across meals that vary in portion size

Alaina Pearce, N. V. Neuwald, J. S. Evans, O. Romano, B. J. Rolls, Kathleen Loralee Keller, 2024, Appetite

The Cerebellar Response to Visual Portion Size Cues Is Associated with the Portion Size Effect in Children

Bari A. Fuchs, Alaina L. Pearce, Barbara J. Rolls, Stephen J. Wilson, Emma Jane Rose, Charles Geier, Hugh Garavan, Kathleen L. Keller, 2024, Nutrients

Fibre-rich Foods to Treat Obesity and Prevent Colon Cancer trial study protocol: a randomised clinical trial of fibre-rich legumes targeting the gut microbiome, metabolome and gut transit time of overweight and obese patients with a history of noncancerous adenomatous polyps

Terryl J. Hartman, Jennifer Christie, Annette Wilson, Thomas R. Ziegler, Barbara Methe, William Dana Flanders, Barbara J. Rolls, Blaine Loye Eberhart, Jia V. Li, Helaina Huneault, Ben Cousineau, Miriam R. Perez, Stephen J.D. O'Keefe, 2024, BMJ Open

Does ‘portion size’ matter? Brain responses to food and non-food cues presented in varying amounts

Bari Fuchs, Alaina L. Pearce, Barbara J. Rolls, Stephen Wilson, E Rose, C Geier, Kathleen Keller, 2024, Appetite on p. 107289

Poorer inhibitory control was related to greater food intake across meals varying in portion size: A randomized crossover trial

Paige Cunningham, Liane S. Roe, Alaina Pearce, Kathleen Keller, Barbara Rolls, 2023, Appetite on p. 107-168

Reasons for meal termination, eating frequency, and typical meal context differ between persons with and without a spinal cord injury

Gary Farkas, Paige Cunningham, Alicia Sneij, John Hayes, Mark Nash, Arthur Berg, David Gater, Barbara Rolls, 2023, Appetite

Portion size affects food selection in an immersive virtual reality buffet and is related to measured intake in laboratory meals varying in portion size

John W. Long, Sarah Pritschet, Kathleen Loralee Keller, Charissa Cheah, Lee Boot, Alexander Klippel, Timothy Brick, Caitlyn G. Edwards, Barbara Jean Rolls, Travis D. Masterson, 2023, Appetite

Variety and portion size combine to increase food intake at single-course and multi-course meals

Paige M. Cunningham, Liane S. Roe, Kathleen Loralee Keller, Barbara Rolls, 2023, Appetite

Switching between foods: A potential behavioral phenotype of hedonic hunger and increased obesity risk in children

Nicholas Neuwald, Alaina Pearce, Shana Adise, Barbara J. Rolls, Kathleen Loralee Keller, 2023, Physiology and Behavior on p. 114312

Most-Cited Papers

NIH working group report: Innovative research to improve maintenance of weight loss

Paul S. MacLean, Rena R. Wing, Terry Davidson, Leonard Epstein, Bret Goodpaster, Kevin D. Hall, Barry E. Levin, Michael G. Perri, Barbara J. Rolls, Michael Rosenbaum, Alexander J. Rothman, Donna Ryan, 2015, Obesity on p. 7-15

Dietary Management of Obesity: Cornerstones of Healthy Eating Patterns

Alissa D. Smethers, Barbara J. Rolls, 2018, Medical Clinics of North America on p. 107-124

Weighing the Evidence of Common Beliefs in Obesity Research

Krista Casazza, Andrew Brown, Arne Astrup, Fredrik Bertz, Charles Baum, Michelle Bohan Brown, John Dawson, Nefertiti Durant, Gareth Dutton, David A. Fields, Kevin R. Fontaine, Steven Heymsfield, David Levitsky, Tapan Mehta, Nir Menachemi, P. K. Newby, Russell Pate, Hollie Raynor, Barbara J. Rolls, Bisakha Sen, Daniel L. Smith, Diana Thomas, Brian Wansink, David B. Allison, 2015, Critical Reviews in Food Science and Nutrition on p. 2014-2053

Dietary energy density: Applying behavioural science to weight management

B. J. Rolls, 2017, Nutrition Bulletin on p. 246-253

What is the role of portion control in weight management

B. J. Rolls, 2014, International Journal of Obesity on p. S1-S8

Double trouble: Portion size and energy density combine to increase preschool children's lunch intake

Samantha M.R. Kling, Liane S. Roe, Kathleen L. Keller, Barbara J. Rolls, 2016, Physiology and Behavior on p. 18-26

Dietary energy density is associated with obesity and other biomarkers of chronic disease in US adults

Jacqueline A. Vernarelli, Diane C. Mitchell, Barbara J. Rolls, Terryl J. Hartman, 2014, Zeitschrift fur Ernahrungswissenschaft on p. 59-65

Portion size has sustained effects over 5 days in preschool children: A randomized trial

Alissa D. Smethers, Liane S. Roe, Christine E. Sanchez, Faris M. Zuraikat, Kathleen L. Keller, Samantha M.R. Kling, Barbara J. Rolls, 2019, American Journal of Clinical Nutrition on p. 1361-1372

What is eaten when all of the foods at a meal are served in large portions?

Liane S. Roe, Samantha M.R. Kling, Barbara J. Rolls, 2016, Appetite on p. 1-9

Dietary energy density and obesity: how consumption patterns differ by body weight status

Jacqueline A. Vernarelli, Diane C. Mitchell, Barbara J. Rolls, Terryl J. Hartman, 2018, Zeitschrift fur Ernahrungswissenschaft on p. 351-361

News Articles Featuring Barbara Jean Rolls

Jul 01, 2024

6 Reasons to Drink Water

It's no magic bullet, but the benefits of water are many.

Full Article

Aug 07, 2023

Why do we always have room for dessert?

Adding variety to your diet may cause you to eat more than you need to

Full Article

Jan 12, 2023

Best Weight-Loss Diets of 2022, Ranked

Winter is a pivotal season. It’s often a turning point for those who’ve been dragging their feet about making healthier choices, like moving more and eating healthier. That’s why, each year, U.S. News & World Report evaluates the most popular diets, and ranks them by category.

Full Article

Jan 06, 2023

Penn State professor’s diet named in the top 10 for overall best weight lost

Each year, the Volumetrics plan has consistently been recommended when people have looked to U.S. News & World Report rankings for advice on diets to improve their health or manage their weight.

Full Article

Jan 03, 2023

Volumetrics again ranked as one of the nation’s best diets

Each year, the Volumetrics plan has consistently been recommended when people have looked to U.S. News & World Report rankings for advice on diets to improve their health or manage their weight.

Full Article

Jan 05, 2022

WTAJ News at 6

This local TV news segment features Barbara Rolls, professor and Helen A. Guthrie Chair of Nutritional Sciences.

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Nov 26, 2021

Why You Always Have Room for Pie

One of the more curious phenomena of the Thanksgiving meal is how we can feel completely full, yet somehow always find room for dessert.

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Feb 17, 2021

Volumetrics Diet: lose weight by eating more

Food. We need it to survive. We consume it every day. Yet, sometimes food has the power to consume us.

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Oct 13, 2020

Tips To Be Fit: How important is water to trying to lose weight?

We have all heard that to curve your appetite just drink water to make your stomach feel full and you won’t eat as much. “Water doesn’t help you eat less,” says Barbara Rolls, a nutritionist at Penn State University. The body has different satiety points for food and water, and one doesn’t translate to the other. But eating foods high in water content could satisfy appetite and curb calorie consumption.

Full Article

Jun 27, 2020

Obesity: America’s number one export?

Food research by the U.S. military, particularly World War II, led to the creation of processed wartime rations. After the Allied victory, the world largely adopted America's processed-food diet, a key factor for the global obesity crisis.

Full Article

Jan 17, 2020

Penn State Professor’s Diet Plan Ranked Second-Best For Weight Loss

Penn State students who have a New Year’s Resolution involving eating healthier can follow an award-winning diet plan that was developed at Penn State.

Full Article

Jan 07, 2020

You can be full and have room for dessert

Those with a sweet tooth will be well versed in feeling full but having space for pudding. Good news for many, an expert claims “dessert stomach” is not only real, but part of our evolution.

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Jan 04, 2020

Weight loss diet developed at Penn State ranked second-best for 2020

A weight loss diet created by a nutritionist at Penn State University has been ranked one of the best to follow in 2020 for those looking to shed pounds.

Full Article

Jan 02, 2020

Weight-loss plan developed at Penn State ties for No. 2 ranking

If eating healthier is on your list of New Year’s resolutions, you may need to look no further than Volumetrics, a diet developed by Penn State Professor of Nutrition Barbara Rolls that has tied for the No. 2 weight-loss plan in this year’s U.S. News & World Report's "Best Diets."

Full Article

Dec 27, 2019

Ist es normal, dass... du immer Nachtisch essen kannst, auch wenn du satt bist?

Zur Vorspeise Häppchen, vielleicht ein bisschen Suppe, dann der Braten mit viel Soße, Kartoffeln, Gemüse – bei einem großen Fest gemeinsam mit Familie und Freunden gönnst wahrscheinlich auch du dir so richtig was.

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Dec 20, 2019

Warum ist für Nachtisch immer Platz?

Barbara Jean Rolls erforscht Ernährungsgewohnheiten an der Pennsylvania State University. Hier erklärt sie, warum Vielfalt das Aufnahmevermögen steigert - nicht nur beim Essen.

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Nov 07, 2019

6 super-filling foods you should be eating If you're always hungry

If hunger is your middle name and hanger follows you like the plague, your diet may be missing the ingredients that deliver sustainable energy and help keep big appetites at bay. A telltale sign is feeling ravenous when your SmartPoints® Budget is near its limit. For a fast fix, start eating the foods that can help you feel full longer—so you spend your days feeling satisfied, not starving.

Full Article

Sep 24, 2019

10 Simple Ways to Eat Less and Still Feel Full

When you want to lose weight, one of the first pieces of advice you’ll hear is “eat less.” But consider the following research from Penn State University.

Full Article

Sep 12, 2019

Can Smaller Plates Really Trick Your Brain Into Eating Less?

If you’re struggling to shed frustrating pounds, you’ve probably tried looking up every trick in the book. One popular technique you may have come across is swapping out larger plates for small ones when dishing out your meals. It's so simple, but does it work?

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Jul 17, 2019

How processed food makes us fat

For many years, I’ve steadfastly clung to a position for which there has been almost no evidence: Processed food is the root of obesity.

Full Article

Jun 27, 2019

What Is the Satiating Diet? A Scientific Review of Its Benefits, Plus 10 Foods You’ll Eat

This diet plan doesn’t cut out any food groups and has the potential to help you lose weight, registered dietitians say.

Full Article

May 16, 2019

‘Ultraprocessed’ foods may make you eat more, clinical trial suggests

Something about the industrial processing of food makes us more likely to overeat, according to a new study. Volunteers ate more and gained more weight on a heavily processed diet than an unprocessed one, even when the two diets had the same available calories and nutrients.

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Apr 15, 2019

Portion size has a 'powerful effect' on eating patterns among kids, study shows

Young kids (aged 3 to 5) were found to be highly susceptible to overeating when given larger portion sizes, challenging the "self-regulation" theory, in which children are claimed to have a natural ability to respond to internal cues of hunger and fullness and adjust eating patterns accordingly, a study by researchers at Penn State suggested.

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Apr 14, 2019

Diet fads: Lose some, gain some

How to lose weight’ is the Holy Grail of Google Search. Aditri Jain will tell you that.

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Apr 14, 2019

Preschoolers not good at resisting large portion of food, says study

Research published in the journal American Journal of Clinical Nutrition examined whether children between the ages of three and five were susceptible to the portion size effect and the tendency of people to eat more when larger portions are served.

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