Behavioral Weight Loss Program for Cancer Survivors in Maryland

Inclusion Criteria: * previously diagnosed with a malignant solid tumor, * completed all required surgical, and/or chemotherapy and/or radiation curative intent therapy at least three months prior to enrollment, * anticipated treatment-free life span of 12 months or longer. * chemoprophylaxis with tamoxifen or aromatase inhibitors for breast cancer in women will be permitted * anti- Luteinizing-hormone releasing therapy for prostate cancer in men will be permitted. * BMI ≥ 25 kg/m2 (BMI ≥ 23 kg/m2 for Asians) and weight ≤ 400 lbs. * have an email address for regular personal use Additional criteria for participants in weight tracking (self-directed or app directed) * willingness to record/transmit quarterly weights for 12 months Additional criteria for App-Directed Program: * willingness to change diet and increase physical activity and track weight, diet and physical activity * have a smart phone for personal use * sufficient data plan/Internet to support daily use of weight loss app\* Additional Criteria for Coach-Directed Weight Loss Program * willingness to lose weight by changing diet and physical activity habits * willingness to track weight, diet and physical activity * willingness to record/transmit quarterly weights for 12 months * smart phone for personal use * data plan/Internet to support daily use of weight loss app\* * willingness to complete coaching calls (12 weekly calls and 3 monthly calls) * sufficient call plan to support coaching calls * a corresponding website could be used, then daily Internet access is required for person use. Exclusion Criteria: * received any chemotherapy (unless anti-hormonal therapy) and/or radiation three months or less prior to the proposed program date * women who are breastfeeding, pregnant, or planning pregnancy within the next year Additional exclusion criteria for participants in weight tracking and/or Coach-Directed Program * self-identification of uncontrolled concurrent medical condition likely to limit compliance with the program as determined by investigators. * current involvement in another organized weight loss program * current use of steroids or other medication known to affect body weight * bariatric surgery scheduled within the next 6 months, or * plan to move outside the continental US in the next 12 months