I have not been treated for cancer but was a primary caregiver for a family member about 2 and a half years ago. It’s very important to keep eating, especially protein during treatment. Find out which foods are most appetizing (not junk or processed foods) and have more of those. My family member had a protein shake once a day. She also had a prescription to reduce nausea. It helps when others eat with you and encourage you to eat just a bit more. Talk to a dietitian specializing in cancer treatment. There may be tips. Is there a particular time of day when you can tolerate food more than at other times? Perhaps reframe your thoughts about eating as your contribution to the treatment process and focus on the positives. From my experience a positive attitude can be the most important factor that you can bring to your health. All the best.

I have not had chemo or radiation therapy, but I helped care for a dear friend in the past that fought breast cancer for 10 years. She had extensive chemo, RT, and a bone marrow transplant. I understand how difficult it is to eat when undergoing treatment.

Dr Li's book "Eat to Beat Disease" has extensive food and beverage lists that support each of the 5 defense systems against disease. He recommends selecting one food or beverage from each group each day, preferably organic when possible. Some foods and beverages are on multiple lists, such as green tea, black tea, and coffee.

Best wishes for success with your treatments.