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Any food that contributes to inflammation in the body is to be avoided. For me it's helped to avoid such foods as gluten, some kinds of dairy and sugar. Also, I eat good quality probiotics in order to avoid getting C-Difficile which is a deadly intestinal overgrowth of bacteria. It can happen by taking antibiotics and from the toxins released into the body during treatment when the "die off" of the organisms flood the body and it can be debilitating. Also, your doctor may want to taylor your diet according to the treatment you are on at the time so it can be more effective.