Evaluation of a Commercial Program on Weight Loss and Health Outcomes

Inclusion Criteria: * Ages 18-75 years * Body Mass Index (BMI) of 25 to 43 * Self-reported desire to lose weight * Willing to discontinue any current over-the-counter (OTC) supplements not recommended/prescribed by physician, with the exception of multivitamins or other vitamin supplement * Willing to follow recommendations required by study protocol * Willing to include demographic information (e.g., ethnicity, income and education) * Use of a personal iPhone on a daily basis * Basic app skills * Reliable home Wi-Fi access * Ability to commit to attending up to 27 study visits in approximately 26 weeks Exclusion Criteria * Participants that are currently, or within the last 6 months, trying to lose weight by following guidelines (e.g., self-initiated programs) or a structured weight-loss program (e.g., at a medical center, university, commercial programs) * Participants who were a member of WW within the past 12 months. * Participants who are involved in any other research studies at this time (also, cannot join other research studies while in this study, over the next 6 months). * Pregnant, nursing, or planning on becoming pregnant over the next 9 months. * Weight loss of ≥ 5 kg in the previous 6 months. * History of clinically diagnosed eating disorder. * Reported health problems that make weight loss or unsupervised exercise unsafe or unreasonable (e.g., orthopedic limitations, heart problems) * Untreated thyroid disease or any changes (type or dose) in thyroid medication in last 6 months. * Taking any prescription medication with known effects on appetite or weight (e.g., oral steroids, weight loss medications such as Qysmia, Contrave, etc.) with the exception of subjects on a stable dose of SSRIs for 6 months * Diuretic use, unless taken on a regular, daily basis for hypertension and on a stable dose for at least 30 days * Chronic/inflammatory gastrointestinal disorders (irritable bowel syndrome is acceptable). * History of heart problems (e.g., angina, bypass surgery, myocardial infarction, etc.) within previous 6 months. * Resting systolic blood pressure \>160 mmHg or resting diastolic blood pressure \>100 mmHg * Diagnosis of type 1 or type 2 diabetes * Previous surgical procedure for weight loss. * Major surgery within the previous 6 months. * Presence of implanted cardiac defibrillator or pacemaker. * History of cancer within past 5 years or current treatment for cancer (completely resected basal or squamous cell carcinoma acceptable if treatment completed more than 6 months prior to enrollment). * Hospitalization for psychiatric disorders during the past 12 months * Self-reported alcohol use \> 7/week standard drinks for females and \> 14/week for males or meets DSM-5 criteria for mild or greater, Alcohol Use Disorder * Planning to relocate in the next 9 months