Objective: Employing Rothschild's Motivation-Opportunity-Ability framework, the present study examines the extent to which heterogeneity in barriers regarding the motivation, the perceived opportunity and the perceived ability to choose low-calorie over high-calorie snacks is associated with the proportion of lowcalorie snack choices in real life. Furthermore, the study investigates which dominant barrier profiles can be discerned. Design: Data were obtained from a survey about participants' motivation, opportunity and ability to choose low-calorie over high-calorie snacks and an FFQ that measured habitual consumption of snack foods and beverages. Data were analysed using R packages lavaan and NbClust, and IBM SPSS Statistics. Setting: A representative sample (n 1318) of the Dutch population based on gender (686 women), age and education level. Results: For both snack foods and beverages, motivation to choose low-calorie over high-calorie snacks was associated strongest with proportions of low-calorie choices. The perceived ability and perceived opportunity were also associated with proportions of low-calorie choices, albeit to a lesser extent. Furthermore, three dominant profiles of barriers were identified: the no-barrier profile, the lackof-opportunity profile and the lack-of-motivation profile. These profiles differed significantly on proportions of low-calorie snack choices, daily meal consumption and sociodemographic characteristics. Conclusions: Heterogeneity in barriers regarding the motivation, the perceived opportunity and the perceived ability to choose low-calorie over high-calorie snacks is associated with the proportion of low-calorie snack choices in real life. By identifying and appreciating heterogeneity in barriers, the present study provides further incentives for the tailoring of intervention strategies.
Keywords
Snack foodsBeverages Low-calorie choices Barriers Motivation ObesityA worrying rise of overweight and obesity rates, accompanied by related chronic and non-communicable diseases, continues to threaten public health around the world (1) . The origin of overweight and obesity lies primarily in an imbalance between the intake and the expenditure of energy (2) . During the last decades there has been an increase in daily eating occasions (3) and therewith daily energy intake has also increased. The excess energy intake is primarily a consequence of a change in snack consumption (3) . In the USA, energy intake through regular meals increased slightly from 1977 to 2006 (8 %), while the energy intake through snacks more than doubled (130 %) (3) . Similar trends have been detected in Europe (4,5) . Since energy expenditure decreased only slightly over the same period (2) , the obesity problem is best described as an issue of systematic caloric overconsumption (6) , with snacking as an increasingly important contributor.Literature on the relationship between weight status and snacking behaviour is inconclusive (7) . This can partly be explained by the fact that weight status is not on...