title: Effects of neuromedin-β on caloric compensation, eating behaviours and habitual food intake.
abstract: We have previously shown that a missense mutation (p.P73T) located in the neuromedin-β gene, a satiety peptide, was associated with higher levels of disinhibition, susceptibility to hunger, and body weight gain over time. In this study we compare caloric compensation, eating behaviour traits, food intake and adiposity between premenopausal women with (T73T) and without (P73P) mutation. Subjects (N=153) were screened to find homozygous women (T73T) that were matched for age, BMI and use of oral contraceptives with 7 women (P73P) not carrying the mutation. Eating behaviour traits were assessed with the Three-Factors Eating Questionnaire and habitual dietary intakes with a 3-day dietary record. A randomized single-blind cross-over design was used to test the effect of p.P73T on caloric compensation. We measured appetite sensations and ad libitum dietary intake following two different energy preloads. We found no difference in eating behaviour traits, adiposity, appetite sensations, ad libitum dietary intake and caloric compensation. However, T73T women had lower habitual energy and carbohydrate intakes than P73P. Differences in carbohydrate intakes disappeared when expressed in percentage of energy. These results suggest that the neuromedin-β p.P73T mutation modulates energy intake without effects on macronutrient. A lack of power resulting from our difficulty to recruit enough T73T women precludes any definitive conclusion regarding the impact of this mutation on caloric compensation.
authors.affiliation: Institute of Nutraceuticals and Functional Foods, Université Laval, Québec (Québec), Canada.
authors.forename: Rosanne
authors.initials: R
authors.lastname: Blanchet
authors.forename: Simone
authors.initials: S
authors.lastname: Lemieux
authors.forename: Patrick
authors.initials: P
authors.lastname: Couture
authors.forename: Luigi
authors.initials: L
authors.lastname: Bouchard
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Vohl
authors.forename: Louis
authors.initials: L
authors.lastname: Pérusse
mesh_terms: D050154:Adiposity / Q000187:drug effects; D000328:Adult; D001066:Appetite / Q000187:drug effects; D015992:Body Mass Index; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004435:Eating / Q000502:physiology; D002149:Energy Intake / Q000187:drug effects*; D005247:Feeding Behavior / Q000187:drug effects*; D005260:Female; D005838:Genotype; D006720:Homozygote; D006801:Humans; D020125:Mutation, Missense; D015287:Neurokinin B / Q000031:analogs & derivatives* / Q000235:genetics; D054647:Nutrigenomics / Q000379:methods; D011110:Polymorphism, Genetic; D016037:Single-Blind Method; D011795:Surveys and Questionnaires; D055815:Young Adult
chemical_list: D004040:Dietary Carbohydrates; D015287:Neurokinin B; C038393:neuromedin B