Time Restricted Eating (TRE) in Bipolar Disorder

The overall goal of this study is to examine the effects of TRE on weight loss and secondary health outcomes in individuals with BD,. A secondary goal is to determine whether these effects are mediated by improvements in circadian rhythms. Using an 8-week trial of 8-hour TRE compared to a wait list control group, the study will test the following specific aims: * Examine the effect TRE on weight loss * if compared to wait list control, individuals assigned to TRE will have greater improvement in waist circumference, depression, anxiety, cognition, sleep and daily functioning. * if a change in circadian timing will significantly mediate the degree of improvement in body weight with TRE. Our sample will be representative of the target population, or adults with bipolar disorder who are currently obese and depressed. The study interventions will be offered via telehealth to reduce barriers to access (e.g., childcare, time, parking/transportation costs, less time out of work). Participants will have a study visit at the start (week 0), midway through (week 4), at the end of the 8-week intervention (week 8), and at a 3-month follow-up (week 20). Study visits will occur after 7 days of monitoring their food intake on Meallogger. To accommodate for scheduling conflicts that may arise, these visits can occur within +3 days of their scheduled dates, if necessary. Study procedures conducted during and surrounding these visits are the same for Weeks 0, 8 and 20. To recognize participants for the time and effort involved in completing all study procedures.