 This review aims to examine the effects of smartphone apps on anthropometric, metabolic, and dietary outcomes at various time points. The meta-analyses show that weight loss is sustained between 3 and 12 months, with a peak of 2.18 kg at 3 months that tapered down to 1.63 kg at 12 months. However, the study did not find significant benefits of weight loss on secondary outcomes examined, except for a slight improvement in systolic blood pressure at 3 months. The included studies covered app-based interventions that comprised of components beyond food logging, such as real-time diet and exercise self-monitoring, personalized and remote progress tracking, timely feedback provision, smart devices that synchronize activity and weight data to smartphones and libraries of diet and physical activity ideas. Future studies could consider the various aspects of the socio-ecological model and conversational and dialectic components that simulate health coaches to enhance user engagement and outcome effectiveness. This article was authored by Hansher Jocelyn Chu, Wee Lingko, Janelle Sheena, Hui Yiying, and others. We are article.tv, links in the description below.