title: Elasticity in portion selection is predicted by severity of anorexia and food type in adolescents.
abstract: The size of portions that people select is an indicator of underlying mechanisms controlling food intake. Fears of eating excessive portions drive down the sizes of portions patients with anorexia nervosa (AN) can tolerate eating significantly below those of healthy controls (HC) (Kissileff et al., 2016). To determine whether patients with AN will also reduce the sizes of typical or ideal portions below those of controls, ANOVA was used to compare maximum tolerable, typical, and ideal portions of four foods (potatoes, rice, pizza, and M&M's) in the same group of 24 adolescent AN patients and 10 healthy adolescent controls (HC), on which only the maximal portion data were previously reported. Typical and ideal portion sizes did not differ on any food for AN, but for HC, typical portions sizes (kcals) became larger than ideal as the energy density of the food increased, and were significant for the most energy dense food. Ideal portions of low energy dense foods were the same for AN as for in HC. There was a significant 3-way (group × food × portion type) interaction, such that HC selected larger maximum than typical portions only for pizza. We therefore proposed that individuals of certain groups, depending on the food, can be flexible in the amounts of food chosen to be eaten. We call this difference between maximum-tolerable, and typical portion sizes selected "elasticity." Elasticity was significantly smaller for AN patients compared to HC for pizza and was significantly inversely correlated with severity of illness. This index could be useful for clinical assessment of AN patients, and those with eating problems such as in obesity and bulimia nervosa and tracking their response to treatment.
authors.affiliation: New York Nutrition Obesity Research Center, Department of Medicine, Columbia University Medical Center, New York, NY, USA; Teachers College, Columbia University, New York, NY, USA.
authors.forename: M
authors.initials: M
authors.lastname: Herzog
authors.affiliation: New York Nutrition Obesity Research Center, Department of Medicine, Columbia University Medical Center, New York, NY, USA; Institute of Human Nutrition, Columbia University College of Physicians and Surgeons, New York, NY, USA.
authors.forename: C R
authors.initials: CR
authors.lastname: Douglas
authors.affiliation: New York Nutrition Obesity Research Center, Department of Medicine, Columbia University Medical Center, New York, NY, USA. Electronic address: hrk2@cumc.columbia.edu.
authors.forename: H R
authors.initials: HR
authors.lastname: Kissileff
authors.affiliation: University of Bristol, Bristol, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Brunstrom
authors.affiliation: Weill Cornell Medical College, White Plains, NY, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Halmi
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D017195:Adolescent Nutritional Physiological Phenomena; D000856:Anorexia Nervosa / Q000209:etiology / Q000503:physiopathology / Q000523:psychology*; D002648:Child; D002652:Child Behavior / Q000523:psychology; D002664:Child Nutritional Physiological Phenomena; D039721:Diagnostic and Statistical Manual of Mental Disorders; D000072001:Diet, Healthy / Q000523:psychology*; D005247:Feeding Behavior / Q000523:psychology; D005260:Female; D005518:Food Preferences; D006801:Humans; D008297:Male; D008960:Models, Psychological; D009518:New York; D050177:Overweight / Q000517:prevention & control / Q000523:psychology; D010349:Patient Compliance / Q000523:psychology*; D064787:Portion Size / Q000009:adverse effects* / Q000523:psychology; D011569:Psychiatric Status Rating Scales; D012720:Severity of Illness Index; D013315:Stress, Psychological / Q000209:etiology / Q000503:physiopathology / Q000523:psychology
keywords: Eating disorders; Food choice; Food intake controls; Perception; Portion size selection