Your oncologist will be the best person for giving you advice on what to do and what to avoid. However, here are a few suggestions on what to eat or use and avoid.
Foods rich in sodium (mainly found in salt) can be harmful to you as they tend to retain water which can, in turn, retain harmful toxins from the treatment in your body.
Avoid fried foods as they tend to have free radicals in them which may be harmful during radiation therapy.
Spicy foods should also be avoided as they tend to irritate the stomach and the rectum and can cause nausea, loose motions, or constipation.
Raw fish or shellfish should be avoided as they contain many viruses and bacteria that can further harm the body as your immunity will be weak due to radiation therapy.
Unpeeled fruits and vegetables contain a lot of fiber and germs on the peel which can be hard to digest and cause infections due to weakened immune systems.
Applying aloe vera on the skin to soothe burns should be avoided at all costs as studies have shown that aloe vera use is associated with higher toxicity levels and is simply ineffective at treating radiation burns.