Majority of breast cancer survivors are overweight or obese at time of diagnosis, putting them at increased risk for insulin resistance and Type 2 Diabetes Mellitus (T2DM). Women with insulin resistance at time of breast cancer diagnosis often have larger tumors, later stages of cancer and worse prognosis. Additionally, chemotherapy often leads to increases in insulin resistance and cognitive impairment. Many cancer survivors experience memory and brain function decline following chemotherapy that can last for years, and insulin resistance may contribute to worse cognitive outcomes in cancer survivors. Omega-3 polyunsaturated fatty acids (PUFAs) are anti-inflammatory nutrients that may help reduce insulin resistance and negative cognitive outcomes from cancer treatments. The purpose of this observational study with cross-sectional design is to investigate the relationship of omega-3 PUFAs with insulin resistance and cognitive function in obese breast cancer survivors. Due to the global pandemic caused by the coronavirus disease of 2019 (COVID-19), this study will be conducted entirely remotely using electronic data collection and remote finger-stick blood sample collection. The study will aim to enroll 80 racially and ethnically diverse female breast cancer survivors (age 45-75) who are postmenopausal, and 1 to 4 years post breast cancer diagnosis. Participants will complete study questionnaires online, and some cognitive tests will be completed through zoom sessions with trained study personnel. Participants will be mailed kits with thorough instructions to complete fingerstick blood sample collections and mail them back to the research lab. Upon receipt of blood samples and completion of all study questionnaires, participation will be complete.

Inclusion Criteria:

• Stage I-III breast cancer diagnosis
• Between 1-4 years post-breast cancer diagnosis
• Postmenopausal (at least 1 year post-menses)
• Ability to access and use internet resources, including Zoom video calls
• English speaking

Exclusion Criteria:

• Diagnosis of type 2 diabetes mellitus
• Unwillingness to complete finger prick for blood collection

Breast cancer survivors from the Central Ohio area, including those who were seen at The Ohio State University Wexner Medical Center James Cancer Hospital for cancer treatment.