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This study evaluates whether a diabetes prevention program, with or without hunger training, can help lower cancer risk in obese participants who are at high risk of breast cancer. Eligible participants are people with a body mass index of 27 kg/m² or higher who are at high risk of breast cancer and are postmenopausal. It is a study without a formal phase and is currently active but not recruiting new participants.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * Body Mass Index (BMI) \>= 27 kg/m\^2. * At high risk of developing breast cancer defined by one or more of the following: Gail model lifetime risk \> 20% or a 5 year risk \>1.66%, a history of deleterious BRCA1/2 mutation or mantle radiation, a history of ductal cancer in situ, or a history of high risk premalignant breast lesion. * 12 months without a period/menstrual cycle or having had a bilateral oophorectomy. * Ability to take digital time stamped photos. * Internet access (daily). * Reports being proficient in English (can read/write and speak fluently). Exclusion Criteria: * Previous participation in this trial. Participation is defined as screening. Re-screening is not allowed except for individuals excluded for BMI. Patients previous screened as ineligible due to BMI are allowed to be re-screened and enrolled if eligible. * Has a current measured BMI less than 27 kg/m\^2. * Reports being unwilling to use Continuous Glucose Monitor (CGM), which requires daily blood sampling by finger pricks. * Currently being actively treated for cancer other than nonmelanoma skin cancer. * Known inability to participate in the ongoing appointments for the four months of the study and scheduled follow-up tests. * Reported current diagnosis or history of type I diabetes or type 2 diabetes. * Reported use of oral antidiabetic agents (OADs). * Current use of any drug (except metformin) or anticipated change in concomitant medication, which the investigator's opinion could interfere with the glucose metabolism (e.g. systemic corticosteroids). * Previous or current treatment with any insulin regimen other than basal insulin, e.g. prandial or pre-mixed insulin (short term treatment due to intercurrent illness including gestational is allowed at the discretion for the investigator). * Previous or current treatment with GLP-1 receptor agonists (e.g. exenatide, liraglutide). * Fasting blood glucose level \> 126 and glycosylated hemoglobin (HbA1c) \> 7%. * Subjects considered by the investigator as unsuitable for the study for reasons not otherwise stated.