Users can enter their current weight, goal weight, and goal rate of weight loss, which allows the app to generate the user's daily, individualized calorie goal. MFP is a calorie-counting app that incorporates evidence-based and theory-based approaches to weight loss. Intervention: MyFitnessPal (MFP) was selected for this study based on previous focus groups with overweight primary care patients. Participants were block randomized by BMI 25-30 kg/m2 and BMI > 30 kg/m2 to either usual primary care (n = 107) or usual primary care plus the app (n = 10 5). Out of 633 individuals assessed, 212 were eligible for the study. The exclusion criteria included pregnancy, hemodi-alysis, life expectancy less than 6 months, lack of interest in weight loss, and current use of a smartphone app for weight loss. The inclusion criteria for the study were ≥ 18 years of age, body mass index (BMI) ≥ 25 kg/m2, an interest in losing weight, and ownership of a smart-phone. Setting and participants: Participants were recruited from 2 primary care clinics in the University of California, Los Angeles heath system. Study design: 2-arm randomized controlled trial. Objective: To evaluate the effectiveness and impact of using MyFitnessPal, a free, popular smartphone application ("app"), for weight loss.
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