Smart Technology for Weight Loss and Metabolic Health

Inclusion Criteria: * Overweight or obese BMI 25-42 kg/m2 * Employed in sedentary occupations * Own a personal smartphone with unlimited data plan or \>4 GigaByte data * Proficient with use of smartphone applications and technology with current daily usage * Ability to engage in moderate intensity exercise * Weight stability for the last 2 months * Participants must be willing to comply with all study-related procedures Exclusion Criteria: * Current or planned pregnancy * Cardiovascular, pulmonary, renal disease, joint disease * Uncontrolled thyroid disease * History of eating disorders, psychiatric disease * History of substance abuse or dependence in the last 1 year * Diabetes * Shift work * Previous weight loss surgery * Use of weight loss drugs/diet/program in the last 6 weeks * Inability to increase walking as a form of exercise and to engage in moderate intensity exercise * Other conditions or medications that affect body weight/appetite/metabolism * Serious or unstable medical or psychological conditions that would compromise the subject's safety for successful participation * Incapable of adhering with an intensive lifestyle intervention using technology and smartphone applications