Liking, wanting and the limits of satiety: unravelling food reward mechanisms in human nutrition

Abstract

Food reward influences what, when and how much people eat but is often treated as a single property of a food or person. This review examines the distinction between liking, the hedonic evaluation of food, and wanting, its motivational pull. These components usually covary, as familiar foods expected to be pleasant are generally also wanted and selected. However, their partial dissociation, when behaviourally relevant, is also informative. In human studies, liking and wanting are inferred from self-report and behavioural tasks rather than observed directly. The Leeds Food Preference Questionnaire assesses explicit liking and wanting for pictured comparison foods, together with a reaction-time-weighted index of implicit wanting. Studies show that hunger generally increases explicit liking and wanting, whereas food intake usually reduces both, particularly for the consumed sensory category. Satiety does not always suppress wanting, and implicit wanting for uneaten alternatives may persist as hunger and liking for the consumed food decline. Contemporary terms such as hyperpalatability, food noise and food addiction can be useful when translated into testable predictions about liking, wanting and subsequent behaviour, but less so if treated as mechanisms. Dietary, physical activity, pharmacological and surgical interventions can alter one or more components of food reward; however, their role in producing clinical outcomes remains uncertain. Understanding when satiety constrains eating and when food reward continues to shape choices and drive intake beyond satiety requires methods that distinguish reward components and the foods assessed. Such methods are important to evaluate whether interventions reduce wanting without diminishing food enjoyment.