Thanksgiving Day marks Family Health History Day, an annual national public health campaign to encourage people to better understand what health characteristics run in their families. Has your mother, sister or grandmother had breast or ovarian cancer? Has your father had prostate cancer? Is there a history of colon cancer, diabetes or high cholesterol in your family? If so, you also could be at risk. John Presutti, D.O., a Mayo Clinic family medicine physician, says don't just talk about your family health history. Act on it. It could save your life.