Cash for calories: AI-Powered rewards aim to boost weight loss

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Willing to attend virtual baseline and follow-up data collection visits 2. At least 18 years of age 3. Verified obesity as defined as a BMI ≥30 kg/m2 4. Agree to attend 13 biweekly group classes (virtual) delivered by a registered dietitian 5. Agree to review study materials between classes 6. Regular access to an unshared smart phone 7. Reliable access to internet 8. Able to speak and read English 9. Desire to lose weight 10. Able to connect to a video conference call using a smartphone, tablet or computer with a webcam and microphone 11. Ability to download and use Fitbit app daily 12. Have or be willing to create a Gmail address 13. Physical ability to stand on a scale without support Exclusion Criteria: 1. Weight loss of at least 10lbs in the month prior to screening 2. Weight \> 380lbs 3. Currently enrolled or enrolled in the previous month in a clinical, research, or community program focusing on lifestyle change that could affect weight 4. New user of weight loss medication 5. Pregnant, lactating or planning on becoming pregnant during the study 6. History of bariatric procedure or planning to have bariatric procedure in the study timeframe 7. Residing in a nursing home, skilled nursing facility or assisted living facility 8. Impaired hearing 9. Significant dementia, drug or alcohol abuse, or unstable psychiatric illness (e.g., schizophrenia, psychosis) 10. Current treatment for cancer or being treated for cancer (besides basal cell carcinoma or squamous cell) in the last 6 months 11. Use of insulin, sulfonylureas, or meglitinides due to increased risk for hypoglycemia 12. Diuretic medication doses higher than hydrochlorothiazide or chlorthalidone 25 mg daily, furosemide 40 mg daily, torsemide 20 mg daily, bumetanide 1 mg daily, or any use of metolazone; use of potassium-sparing diuretics is acceptable 13. Unstable heart disease in the 6 months prior to screening 14. Chronic kidney disease at stage 4 or higher 15. Exertional chest pain 16. Pain, fainting, or other conditions that prohibit mild/moderate exercise 17. History of ascites requiring paracentesis 18. Inducing vomiting to prevent weight gain or counteract the effects of eating an average of 1 time per week or more in the past 3 months\* 19. Not suitable for study participation due to other reasons at the discretion of the investigators