Reducing Obesity Using Social Ties Program

Inclusion Criteria: * Index Participant: 1. Black race or Hispanic ethnicity 2. Male or Female 18 years of age or older 3. Calculated BMI \> 30kg/m2 from objectively measured height and weight by study staff 4. Access \& willingness to use program food intake app via home computer or a smartphone 5. Ability to identify at least one adult social network member who will participate in the study * Social Network Member: 1. Male or Female 18 years of age or older 2. Access to the internet or a smartphone Exclusion Criteria: * Index Participant: 1. Active enrollment in a weight-loss program, use of weight-loss medications, or planning weight-loss surgery 2. Advanced medical illness, dementia, hospitalization, injury, or pregnancy that inhibits regular physical activity 3. Contraindications to exercise based on the Physical Activity Readiness Questionnaire or lack of clearance from a health care provider 4. Unresolved Food insecurity 5. Speaks a language other than English or Spanish * Social Network Member: 1. Speaks a language other than English or Spanish