Novel flavours paired with glutamate condition increased intake in older adults in the absence of changes in liking

• Published in: Appetite Vol. 90; pp. 108 - 113
• Main Authors: Dermiki, Maria, Prescott, John, Sargent, Laura J., Willway, Joanne, Gosney, Margot A., Methven, Lisa
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2015
• Subjects: Aged; Aged, 80 and over; Conditioned intake; Conditioned liking; Consumption; cumin; Cuminum - chemistry; Cymbopogon; Cymbopogon - chemistry; Diet; Eating - drug effects; elderly; Female; flavor; Flavoring Agents - administration & dosage; Glutamate; glutamic acid; Humans; Male; malnutrition; Meals; monosodium glutamate; potatoes; Random Allocation; Single-Blind Method; Sodium Glutamate - administration & dosage; Solanum tuberosum; soups; Taste - drug effects; Taste Perception - drug effects; Wanting; Consumption; Wanting; Conditioned intake; Glutamate; Conditioned liking
• DOI: 10.1016/j.appet.2015.03.002
• ISSN: 0195-6663; 1095-8304

•Glutamate can condition increased food consumption in older adults.•Older adults increased consumption of novel flavoured soups paired with glutamate.•Older adults did not increase liking of novel flavoured soups paired with glutamate. Previous research on the repeat exposure to a novel flavour combined with monosodium glutamate (MSG) has shown an increase in liking and consumption for the particular flavour. The aim of the current work was to investigate whether this could also be observed in the case of older people, since they are most affected by undernutrition in the developed world and ways to increase consumption of food are of significant importance for this particular age group. For this study, 40 older adults (age 65–88) repeatedly consumed potato soup with two novel flavours (lemongrass and cumin) which were either with or without a high level of MSG (5% w/w). A randomized single blind within-subject design was implemented, where each participant was exposed to both soup flavours three times over 6 days, with one of the soup flavours containing MSG. After three repeat exposures, consumption increased significantly for the soups where the flavours had contained MSG during the repeated exposure (mean weight consumed increased from 123 to 164 g, p = 0.017), implying that glutamate conditioned for increased wanting and consumption, despite the fact that the liking for the soup had not increased.