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Psychosocial Influences on Fruit and Vegetable Intake Following a NYC Supermarket Discount
Author(s) -
BernalesKorins Maria,
Ang Ian Yi Han,
Khan Shamima,
Geliebter Allan
Publication year - 2017
Publication title -
obesity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.438
H-Index - 199
eISSN - 1930-739X
pISSN - 1930-7381
DOI - 10.1002/oby.21876
Subject(s) - psychosocial , overweight , medicine , intervention (counseling) , randomized controlled trial , obesity , psychiatry
Objective To assess the effect of a 50% discount on fruits and vegetables (F&V) on the purchase and intake of F&V and on psychosocial determinants of F&V intake: self‐efficacy (SE), stages of change (SOC), and perceived barriers (PB). Methods This randomized controlled trial was conducted in local supermarkets over 16 weeks, including a 4‐week baseline, 8‐week discount intervention, and 4‐week follow‐up. Shoppers with overweight or obesity (BMI > 25) were randomized to receive a discount or no discount via their reward scan card after the baseline. Twenty‐four‐hour recalls and psychosocial measures were obtained for each study period. Results Purchases ( P < 0.0005) and intakes ( P = 0.019) of F&V increased significantly during the intervention, while only F&V intake was sustained at follow‐up. The discount intervention increased SE ( P < 0.01) and SOC ( P < 0.05) and did not decrease PB ( P = 0.057) during the intervention. SOC mediated the discount intervention effect on F&V intake ( P < 0.05) during the intervention, explaining 43% of variance. Conclusions A supermarket discount intervention led to increases in purchases and intakes of F&V and increases in the psychosocial factors SE and SOC and did not decrease PB. The discount intervention prompted participants to move from the preparation to action stage of SOC, which acted as a mediator for increased F&V intake.