Keywords: Obesity / Overweight | Ecological Momentary Assessment | Internet
Presentation Type: Symposium
“Think Slim” is a tailored e-coach-intervention for overweight people that is based on cognitive behavior therapy (CBT). In study 1, we examined predictors of food consumption in 57 overweight (BMI > 25) and 43 healthy-weight people (BMI < 25) using Ecological Momentary Assessment (EMA). A decision tree algorithm considering the longitudinal structure of the dataset was used to predict healthy versus unhealthy eating events. Rules that were derived from this decision tree were used to cluster participants to one of six groups (e.g., ‘evening-at-home eaters’) based on the rule triggering frequencies. In a randomized clinical trial (study 2), Think Slim (n = 46) was compared to a diet-only control group (n = 50) that received no support. Think Slim (6 weeks) consisted of an iPhone app and ten web-based CBT sessions. Preceding the intervention phase, participants collected EMA data for a week, including approximately the same variables as in study 1, to achieve semi-tailoring by matching each participant to one of the six groups. After the intervention was finished, another week of EMA data collection followed, to be able to study the change in the time-lagged networks of variables related to eating behavior from pre to post treatment. Outcome measures included: BMI, self-reported dysfunctional cognitions and emotions / states, eating styles, eating disorder psychopathology, psychiatric symptoms, and self-esteem, which were assessed at post-test, 3 month FU, and 12 month FU. In addition, pre to post change in time-lagged networks of variables related to eating behavior was investigated. At post-test, BMI, eating disorder psychopathology and self-liking improved in both conditions, with no significant advantage for Think Slim. Think Slim, as compared to the control group, led to a greater reduction in dysfunctional cognitions related to food intake, emotional eating, and external eating. Results of the 3-mo and 12-mo FU will be presented as well. Moreover, changes in group-level and individual-level time-lagged networks due to therapy will be presented. The cognitive and emotional improvements achieved by Think Slim may aid in long-term weight-loss maintenance.
Maastricht University, the Netherlands
Saturday, November 18
1:45 PM – 3:15 PM
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