I was never told to avoid eating any certain food groups, nor not to eat raw fruit or veg that wasn't cooked or peeled. That seems strange to me that you were told that, unless of course you have comorbidities that are of concern. I had a full one hour (one on one) with an oncology nurse who gave me a rundown of what to avoid, it was called an education session on do and don't whilst on chemotherapy. It sounds like they are talking about listeria concerns. As long as everything is washed and no cross contamination is wise whether going through cancer treatment or not.
@Bluehibiscus can I ask who gave you the advice not to eat soft cheese? Take care and best wishes. xx
