A Study of LY4064912 in Healthy Participants and With Overweight or Obesity

Inclusion Criteria: * Age is 21-65 years old at Singapore Sites * Participants who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and cardiac monitoring Part A: Body Mass Index (BMI) within the range greater than or equal to 21 and less than 30 kilogram per square meter (kg/m²) Part B: a BMI greater than or equal to 27 and less than 45 kg/m² Part C: a BMI greater than or equal to 21 and less than 35 kg/m² * Parts A and C: Participants must weigh 60 kilograms (kg) or more at screening * Have had a less than 5% change in body weight for 3 months before screening * Safety laboratory tests are within normal reference range Exclusion Criteria: * Have a history or presence of cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematological, or neurological disorders capable of significantly altering the absorption, metabolism, or elimination of drugs; of constituting a risk when taking the investigational product; or of interfering with the interpretation of data * Have history of diabetes (except gestational diabetes) or current diagnosis of diabetes (any form), or have HbA1c greater than or equal to 6.5% (48 millimole per mole (mmol/mol)) at screening * Are individuals of childbearing potential (IOCBP).