Efficacy of Lifestyle Intervention in BRCA1/2 Mutation Carriers

This study is testing whether lifestyle changes — including exercise and a Mediterranean-style diet — can improve health outcomes for women who carry the BRCA1 or BRCA2 gene mutation, which significantly raises the risk of breast and ovarian cancer. **You may be eligible if...** - You have a confirmed BRCA1 or BRCA2 gene mutation - You are 18 years of age or older - You are willing to sign a consent form **You may NOT be eligible if...** - You are currently receiving chemotherapy or radiation (though you may be eligible 6 weeks after finishing) - Your cancer has spread to other parts of the body (metastatic disease) - Your life expectancy is less than 3 years - You have serious heart or lung disease that limits physical activity - You have significant joint or bone problems that prevent group exercise - You have food allergies that would prevent following a Mediterranean diet, or you follow a vegan diet - You are pregnant - Your BMI is below 15 - You have insufficient knowledge of German - You are already actively participating in another intervention trial Talk to your doctor to see if this trial is right for you.