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Summary   Objective  Evaluate the effects of an online commercial weight management program, with and without provision of a ‘smart’ scale with instructions to weigh daily and weekly tailored feedback, on weight loss and the frequency of body‐weight self‐monitoring.    Methods  Participants ( N  = 92; body mass index 27–40 kg/m 2 ) were randomized to 6 months of no‐cost access to the Weight Watchers Online (WWO) platform alone, or enhanced with a cellular‐connected ‘smart’ scale, instructions to weigh daily and weekly pre‐scripted email feedback (Weight Watchers Online Enhanced [WWO‐E]). The number of days that weight was self‐monitored (via ‘smart’ scale in WWO‐E and manually in WWO) was recorded automatically across the 6‐month trial. Objective weight was measured at baseline, 3 and 6 months.    Results  While both groups achieved statistically significant weight loss, mean ± standard error weight loss did not differ between WWO‐E and WWO at 3 months (5.1 ± 0.6 kg vs. 4.0 ± 0.7 kg, respectively;  p  = 0.257) or 6 months (5.3 ± 0.6 kg vs. 3.9 ± 0.7 kg, respectively;  p  = 0.116). However, a greater proportion of WWO‐E lost ≥5% of initial body weight at 3 months (52.2% vs. 28.3%;  p  = 0.033), but not 6 months (43.5% vs. 30.4%;  p  = 0.280), compared with WWO. Mean ± standard deviation days with self‐monitored weight was higher in WWO‐E (80.5 ± 5.6; 44.7% of days) than WWO (12.0 ± 1.0; 6.7% of days;  p  < 0.001) across the 6‐month study period.    Conclusions  This is the first study to show that provision of a ‘smart’ scale with weekly tailored feedback substantially increased the frequency of self‐weighing and the proportion of participants achieving an initial clinically significant ≥5% weight loss (52% vs. 28%) in an online commercial weight management program. Both WWO and WWO‐E produced significant weight loss over 6 months. While mean weight losses were slightly greater in the enhanced group, the difference was not statistically significant in this small sample. This study provides support for the clinical utility of online commercial weight management programs and the potential for supporting technology such as ‘smart’ scales to improve adherence to body‐weight self‐monitoring and clinical outcomes.

obesity science and practice

Weight loss and frequency of body‐weight self‐monitoring in an online commercial weight management program with and without a cellular‐connected ‘smart’ scale: a randomized pilot study