Abstract
Objective: The purpose of this study was to examine the effects of different scoring protocols used with the Regulation of Eating Behaviour Scale (REBS; Pelletier et al., 2004). The REBS is a 24-item self-report instrument designed to assess motives that regulate healthy eating behaviour using Organismic Integration Theory (Deci & Ryan, 2002) as a guiding framework. Methods: A multi-cohort investigation was undertaken including a 6-month prospective study (N = 246; Higher education staff/employees), a cross-sectional study (N = 377; Philippine university students/staff), and an internet-based daily diary study (N = 82; Weight-monitoring program attendees). Dietary intake was assessed using self-report instruments or digital monitors. All cohorts completed the REBS. Results: Effect sizes varied with the use of different REBS scoring protocols (R2adj. = 0.02-0.35) whereby models using the Relative Autonomy Index or Autonomous/Controlled motives accounted for less variance than item-aggregation models. Integrated regulation was the strongest correlate of fruit/vegetable (r12 = 0.27-0.56) and reduced fat (r12 = -0.20) consumption. Discussion: Self-determined yet extrinsic motives for healthy eating appear to be important resources that regulate dietary intake. Scoring protocols used in eating behaviour research with the REBS represent a key consideration for OIT-based studies attempting to disentangle the motivational basis of healthy eating.Acknowledgments: Funding provided by the SSHRC & BUAF