Mobile Methods for Reducing Obesity Risk in Parents and Children

Inclusion Criteria (parent): * Currently age 21-55. * Body mass index (BMI) of 25-50 kg/m². * Have one child between the ages of 2-12. * Own an iPhone running at least iOS11 with a data and text messaging plan. * Have the ability to read, write, and speak English. Inclusion Criteria (child): * Currently age 2-12. Exclusion Criteria (parent): * Lost more than 10 pounds in the last 6 months. * Currently participating in another nutrition or weight loss program. * Currently meeting exercise recommendations of 150 minutes per week of moderate-to-vigorous physical activity. * Currently pregnant or breastfeeding, pregnant within the past 6 months, or planning to become pregnant within the next 6 months. * Planning to relocate in the next 8 months. * Will be out of town for 2 weeks or more in the next 8 months. * Cannot attend two visits at the UNC Weight Research Program clinic. * Pre-existing medical condition(s) that preclude adherence to an unsupervised exercise program, as determined by items endorsed on the PAR-Q (Physical Activity Readiness Questionnaire). * Treatment of diabetes with insulin or oral medications that may cause hypoglycemia. * History of clinically diagnosed eating disorder. * Diagnosis of schizophrenia or bipolar disorder. * Hospitalization for a psychiatric diagnosis within the last year. * Report a past diagnosis of or current symptoms of alcohol or substance dependence. * Another member of the household (family member or roommate) is a participant or staff member in this study.