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

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0226 Henderson Bldg
University Park, PA 16802 - bjr4@psu.edu
- 814-863-8572
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Food Weights And Measures Child Obesity Meals Portion Size Weight Loss Preschool Children Energy Intake Eating Vegetables Research Fruit Snacks Cross Over Studies Maintenance Feeding Behavior Diet Energy Lunch Eating Behavior Rating Milk Ingestion SleepMost Recent Publications
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 J. 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, Sara J. Pritschet, Kathleen Loralee Keller, Charissa S.L. Cheah, Lee Boot, Alexander Klippel, Timothy R. Brick, Caitlyn G. Edwards, Barbara Jean Rolls, Travis D. Masterson, 2023, Appetite
Switching between foods: A potential behavioral phenotype of hedonic hunger and increased obesity risk in children
Nicholas V. Neuwald, Alaina Pearce, Shana Adise, Barbara J. Rolls, Kathleen Loralee Keller, 2023, Physiology and Behavior
Food Properties and Individual Characteristics Influence Children's Intake Across Multiple Days of Weighed Assessments in Childcare Programs
Liane S. Roe, Kathleen L. Keller, Barbara J. Rolls, 2023, Journal of Nutrition on p. 1646-1655
The effects of snack foods of different energy density on self-served portions and consumption in preschool children
Hanim Diktas, Liane Stevens Roe, Kathleen L. Keller, Barbara Jean Rolls, 2023, Appetite on p. 106527
Dimensions of sleep quality are related to objectively measured eating behaviors among children at high familial risk for obesity
Faris Zuraikat, Jonathan Bauman, Marissa Setzenfand, David Arukwe, Barbara J. Rolls, Kathleen Loralee Keller, 2023, Obesity
Eating rate and bite size were related to food intake across meals varying in portion size: A randomized crossover trial in adults
P Cunningham, Liane S. Roe, Kathleen Loralee Keller, A Hendriks-Hartensveld, Barbara J. Rolls, 2023, Appetite
Children with lower ratings of executive functions have a greater response to the portion size effect
Kathleen L. Keller, Alaina Pearce, Bari Fuchs, Kyle Hallisky, Barbara J. Rolls, Stephen J. Wilson, Charles Geier, E Rose, 2023, Appetite
Dietary energy density and its contribution to weight control
Faris Zuraikat, Barbara Rolls, 2022,
Children's Portion Selection Is Predicted by Food Liking and Is Related to Intake in Response to Increased Portions
Hanim Diktas, Kathleen Loralee Keller, Liane S. Roe, Barbara J. Rolls, 2022, Journal of Nutrition on p. 2287-2296
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
Myths, presumptions, and facts about obesity
Krista Casazza, Kevin R. Fontaine, Arne Astrup, Leann L. Birch, Andrew W. Brown, Michelle M. Bohan Brown, Nefertiti Durant, Gareth Dutton, E. Michael Foster, Steven B. Heymsfield, Kerry McIver, Tapan Mehta, Nir Menachemi, P. K. Newby, Russell Pate, Barbara J. Rolls, Bisakha Sen, Daniel L. Smith, Diana M. Thomas, David B. Allison, 2013, New England Journal of Medicine on p. 446-454
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
What is the role of portion control in weight management
B. J. Rolls, 2014, International Journal of Obesity on p. S1-S8
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
Dietary energy density: Applying behavioural science to weight management
B. J. Rolls, 2017, Nutrition Bulletin on p. 246-253
Serving a variety of vegetables and fruit as a snack increased intake in preschool children
Liane S. Roe, Jennifer S. Meengs, Leann L. Birch, Barbara J. Rolls, 2013, American Journal of Clinical Nutrition on p. 693-699
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
News Articles Featuring Barbara Jean Rolls
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.
Full Article
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.
Full Article
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.
Full Article
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