Usefulness of a Standalone Smartphone App for Weight Management among Middle-Aged People with Overweight/Obesity

We developed a standalone smartphone app for weight management for middle-aged people. Among people living in Okinawa, Japan, participants were required to have BMI 25 or greater at the time of online registration. The intervention was a 3-month duration using the following four functions: recording of walking steps, diet content and bodyweight, and reading basic health knowledge. Among 87 participants who met our study criteria, 47 (54%) adhered to the program to endline and 28 participants (60%) lost body weight (0.3-5.6 kg loss: 0.3-7.1% loss). Frequency of recording walk steps was associated with BMI reduction with beta coefficient of 0.00847 (95% confidence interval, -0.01595 to -0.00099). No cases of adverse health events were reported during our study period. A standalone app can play an important role in weight management among middle-aged people with overweight/obesity.