During cancer treatment, be careful of what you're putting into your body there are Some foods for cancer patients to avoid. Read nutrition labels and make as much food as possible at home. It's recommended to avoid overly refined and processed foods in your cancer patient diet. Fried meals with a lot of hydrogenated oils, which might cause inflammation, should also be avoided. Because persons with cancer frequently have weakened immune systems, avoid items that might cause food poisoning, such as: Sushi is a type of lightly cooked or raw seafood. Eggs that have been softly cooked or meals that incorporate raw eggs, such as homemade mayonnaise Cheeses and dairy products that have not been pasteurized Fruits and vegetables that haven't been washed