10 Natural Foods That Help Fight Cancer . In order to defeat cancer and ensure there is no recurrence, the body must be brought. nto balance and the immune system rebuilt and fine tuned. So how is this feat accomplished? Detox, detox, detox and achieve a slightly alkaline pH, while filling the body with the best, organic, nutritionally dense food available. Your goal is to rebuild a killer immune system as you bathe every noncancerous cell in your body with nutrition. For specific foods known to eliminate cancer, check out the following list: 1. Omega 3 Oily fish, fish oil, flax seed oil, hemp oil, and healthy oil blend supplements provide omega 3 fatty acids (and other beneficial fatty acids), which fight inflammation and make the body less hospitable to cancer cells. Vitamin D is also known to kill cancer, and you can find many fish oils and some vegan oil blends with vitamin D in them. 2. Cruciferous Vegetables Cruciferous vegetables include broccoli, cauliflower, cabbage,...