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Obesity is a serious public health problem. There is a need for scalable weight loss interventions that can help people lose weight and decrease their risk of obesityrelated chronic disease development. Self-monitoring is a key component of successful weight loss. The Eat Less, Move More (ELMM) device is wrist-worn, and is capable of counting bites by detection of a wrist-roll motion that is specific to eating. The device can also measure seconds between bites, as a proxy to eating rate (ER) measurement, as well as the number of steps taken by the user. The aim of this body of research was to explore the effects of the ELMM device within a weight loss intervention focused on decreasing the size and number of bites, reducing ER, and increasing physical activity, as well as increasing awareness of physiological cues to eating. The first chapter focuses on the examination of the ELMM device-assessed proxy to ER, seconds between bites, with self-reported eating rate (SRER). The average number of seconds between bites as measured by the ELMM device is referred to in this body of work as the bite count interval (BCI). Data from the first three days of participants’ use of the ELMM to track bites and BCI were examined, and results showed a significant difference in BCI as measured by the ELMM among SRER categories. These findings suggest that the ELMM is capable of measuring BCI in free-living eating situations, an important first step in establishing the validity of this device in its ability to reflect free-living eating rate. The second chapter explores the effects of a workbook-based weight loss intervention on body weight change (primary outcome), and energy intake (EI), ER, and energy expenditure (secondary

Exploring the Role of a Novel Device in Weight Loss Outcomes and Behaviors