||5R01CA105832-05 Interpret this number
||Boston Medical Center
||Trial of 2 Telecomputer Diet Change Maintenace Programs
Health behavior change interventions have focused on obtaining short-term intervention effects; few studies have
evaluated mid-term and long-term outcomes, and even fewer have evaluated interventions that are designed to maintain
and enhance initial intervention effects. Moreover, behavior theory has not been developed for maintenance or applied to
maintenance intervention design to the degree that it has for behavior change initiation. Finally, for both the initiation and
maintenance of important health-related behavior, there is a need for population-based interventions that combine the
effectiveness of face-to-face professional intervention and the reach of mass-media programs. This may be achieved by
telecommunications technology-based interventions that are based on appropriate behavior change theory and the
heuristics of trained professionals.
The aim of the present proposal is to adapt and evaluate a totally automated, telephone-based dietary behavior
change intervention that has been shown to be efficacious in a previous study to the maintenance of dietary change. The
study will focus on reducing cancer risk by increasing consumption of fruits and vegetables (F&V) and improving overall
A representative sample of 1531 adults from a large urban area will be recruited through random digit dialing to
participate in a 2-arm RCT with assignment to an efficacious automated dietary behavior change program (Telephone-
Linked Care for Diet or TLC-DIET) based on SCT and Goal Setting Theory or to an assessment only control condition.
Those participants who respond to the intervention (increase their daily consumption of F&V by > 1 serving) (n=405) will
be randomly assigned to one of 3 arms: (1) an assessment only control condition, (2) a maintenance intervention based
on SCT and Goal Setting Theory (TLC-EAT.Extended [TCL-EAT.EXT], and (3) a maintenance intervention based on a
novel theory (Goal Systems Theory [GST]) (TLC-EAT.Goal Management [TLC-EAT.GM]). GST focuses on the
management of other life goals such that the targeted "new" goal (specific dietary behavior) is protected and enhanced.
The maintenance interventions will last for 6 months, following by 18 months of observation. All groups are assessed at
baseline, 3, 6, 9, 12, 15, 18, and 24 months.
The study hypotheses are (1) TLC-EAT.GM > TLC-EAT.EXT > Control at all follow-up time points for F&V consumption
and overall diet quality, and (2) intervention effects will be mediated by behavioral factors predicted by SCT (self-efficacy,
etc.) and GST (goal shielding, etc.).
Comparison of two theory-based, fully automated telephone interventions designed to maintain dietary change in healthy adults: study protocol of a three-arm randomized controlled trial.
, Quintiliani L.M.
, Turner-McGrievy G.M.
, Migneault J.P.
, Heeren T.
, Friedman R.H.
JMIR research protocols, 2014-11-10; 3(4), p. e62.
The interaction between dietary and life goals: using goal systems theory to explore healthy diet and life goals.
, Wright J.A.
, Migneault J.P.
, Quintiliani L.
, Friedman R.H.
Health psychology and behavioral medicine, 2014-01-01; 2(1), p. 759-769.