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Dr. Barbara J. Rolls is professor of nutritional sciences and the Helen A. Guthrie Chair in nutrition at Penn State University. She received a BA in biology from the University of Pennsylvania and a PhD in physiology from the University of Cambridge, England. After spending her early research career at the University of Oxford, England, Dr. Rolls joined the faculty of the Johns Hopkins University School of Medicine as professor of psychiatry. In 1992, she became a faculty member at Penn State.

Dr. Rolls has is past-president of both the Society for the Study of Ingestive Behavior and The Obesity Society, and has been a member of the Advisory Council of the NIH's National Institute of Diabetes and Digestive and Kidney Diseases.

Dr. Rolls is the recipient of a number of awards, including the American Society of Nutritional Sciences Award in Human Nutrition and a MERIT award from the National Institute of Diabetes and Digestive and Kidney Diseases.

She is the author of five books, including The Volumetrics Weight-Control Plan: Feel Full on Fewer Calories and The Volumetrics Eating Plan.