It goes without saying that GMOs have no legitimate place in any cancer-free diet, especially now that both GMOs and the chemicals used to grow them have been shown to cause rapid tumor growth. But GMOs are everywhere, including in most food derivatives made from conventional corn, soybeans, and canola. However, you can avoid them by sticking with certified organic, certified non-GMO verified, and locally-grown foods that are produced naturally without biotechnology.
2) Processed meats
Most processed meat products, including lunch meats, bacon, sausage, and hot dogs, contain chemical preservatives that make them appear fresh and appealing, but that can also cause cancer. Both sodium nitrite and sodium nitrate have been linked to significantly increasing the risk of colon and other forms of cancer, so be sure to choose only uncured meat products made without nitrates, and preferably from grass-fed sources.