Keeping your cholesterol levels within a healthy range helps lower your risk for heart attack and stroke. For women, there’s an added cholesterol connection: breast cancer. If you struggle with chronic high cholesterol, you’re at an increased risk of breast cancer spreading. A new study shows that breast cancer cells use cholesterol to develop tolerance to stress, making cells more resilient and less likely to die. While most of them do die, the ones that survive come away even stronger and may multiply and spread to other parts of the body. Finding this link means doctors develop therapies that target this process and create better treatment for advanced breast cancer.