Omega-3 fatty acids may help prevent cancer by inhibiting cancer cell proliferation and disrupting steps that are critical to tumor growth. Omega-3 fatty acids also help reduce inflammation, which means they could theoretically reduce the possibility of cellular mutations. But even if omega-3s don't directly reduce the risk of cancer, they certainly help keep our bodies strong and healthy. For all of these reasons, I highly recommend adding omega-3–rich foods to your diet. In addition to fatty fish and shellfish, mixing ground flaxseed into yogurt and smoothies is an excellent way to include more omega-3s in your diet.