A Study to Investigate Weight Management With Bimagrumab (LY3985863) and Tirzepatide (LY3298176), Alone or in Combination, in Adults With Obesity or Overweight

Inclusion Criteria: * Have a BMI of * ≥30 kilograms per square meter (kg/m2) or * ≥27 kg/m2 and \<30 kg/m2, with at least one of the following weight-related comorbidities: * Hypertension * Dyslipidemia * Cardiovascular disease * Obstructive sleep apnea * Have had a stable body weight for the 3 months prior to randomization (\<5% body weight gain and/or loss) Exclusion Criteria: * Have a prior or planned surgical treatment for obesity * Have at least one laboratory value suggestive of diabetes during screening * Use of metformin, or any other glucose-lowering medications * Have Type 1 Diabetes, latent autoimmune diabetes, been diagnosed with any form of diabetes mellitus except for a prior diagnosis of gestational diabetes mellitus, or history of ketoacidosis or hyperosmolar coma * Have poorly controlled hypertension * Have any of the following cardiovascular conditions within 3 months prior to screening: * acute myocardial infarction * cerebrovascular accident (stroke) * unstable angina, or * hospitalization due to congestive heart failure * Have ongoing or a history of frequent intermittent or chronic tachyarrhythmia syndromes * Have ongoing or a history of bradyarrhythmias other than sinus bradycardia * Have a history of New York Heart Association (NYHA) Functional Classification III or IV congestive heart failure * Have a history of symptomatic gallbladder disease within the past 2 years * Have signs and symptoms of any liver disease * Have a disease or condition known to cause gastrointestinal malabsorption or a known clinically significant gastric emptying abnormality * Have a history of acute or chronic pancreatitis * Have renal impairment, measured as estimated glomerular filtration rate \<30 mL/minute/1.73 m2 * Currently taking or have taken medications that may cause significant weight gain or promote weight loss within 3 months prior to screening