Remotely Delivered Behavioral Weight Loss Using an Ad Libitum Plant-Based Diet Versus a Balanced Calorie Deficit Diet

Inclusion Criteria: * BMI 27-50 kg/m2 * Ages 18-75 years * Resides in the U.S. * Consistent access to internet at home * Proficient skill level in speaking, writing, and understanding English * Reporting a desire to lose weight * Consistently available for 15-minute once-weekly video appointment between the hours of 8 AM and 7 PM EST * Willing to follow a whole food plant-based diet or a traditional calorie-reduced diet for the study duration * Individuals must provide consent for the research team to contact their personal physician if necessary, to provide clearance or to consult about rapid weight loss Exclusion Criteria: * Currently pregnant or breastfeeding or planned pregnancy within the study period * Recent weight loss (≥ 5% weight loss in 3-months prior to the study) * History of bariatric surgery * Currently following a low-fat plant-based diet * Medical condition (e.g., cancer, type I diabetes, renal failure), current substance use problem, or psychiatric condition (e.g., active substance abuse, eating disorder) that may pose a risk to the participant during intervention or cause a change in weight * Recently began or changed the dose of a medication that can cause significant change in weight * Planning on quitting cigarette smoking over the program period * Participation in a concurrent weight loss program during the study period * Medical diagnosis currently influencing weight or appetite * Medical condition that would limit ability to participate in this pro…