Inclusion Criteria:  18-25 years of age BMI (body mass index) 25-45 kg/m2 Female gender identity  Exclusion Criteria:  Report of uncontrolled medical condition that may pose a safety issue given the recommendations for the diet and unsupervised physical activity Diagnosed cardiovascular or metabolic disease Report of a heart condition, chest pain during periods of activity or rest, or loss of consciousness Recent change in use of medications that may impact weight or metabolic function Cancer in the past 5 years, except non-melanoma skin cancers or early-stage cervical cancer Current symptoms of alcohol or other substance dependence Report of diagnosis or history of Anorexia Nervosa or Bulimia Nervosa, or any compensatory behaviors within the previous 3 months Hospitalization for depression or other psychiatric disorder within the past 12 months Lifetime history of bipolar disorder or psychotic disorder Planning to move from the area within the study period Currently pregnant, pregnant within the past 6 months, currently breastfeeding or planning to become pregnant within the next 6 months Current involvement in a weight loss program or current use of weight loss medication Recent significant weight loss Inability to read or speak English Lack of a smartphone or unwillingness to use it for study components