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O BESITY IS A PUBLIC HEALTH burden associated with a number of adverse health conditions and high health care costs. As an integral part of standard behavior-based therapy, selfmonitoring has been used in many lifestyle intervention programs to address the obesity epidemic. In weight management, self-monitoring usually consists of tracking dietary intake, physical activity, body weight, and/ or other health measurements. Previous research examined the efficacy of dietary self-monitoring on weight management. However, most of those studies addressed self-monitoring using traditional paper methods. The subsequent development and use of advanced technology-based self-monitoring approaches shows promising effects inweight loss.We evaluated the emerging evidence on the efficacy and adherence to different types of dietary self-monitoring, including traditional paper methods, web-based self-monitoring, and the use of mobile devices such as personal digital assistants, wearables, and tablets/mobile smartphones. Motivations and barriers to dietary selfmonitoring are described and strategies to improve adherence are identified. A discussion on future directions of dietary self-monitoring approaches in research and practice is also provided.