Hello Nas and thanks for posting, 

As far as I am aware, it isn't know if foods naturally high in antioxidants can slow down the growth of existing cancers in people. The usual advice to people with cancer is to follow a healthy, varied and well balanced diet including a decent amount of plant based foods which are generally higher in antioxidants, but this is the same advice that is given to everyone.

I am glad to know that your mum's appetite is improving. Chemotherapy can sometimes affect the appetite and the way food tastes and some people may go off their food or feel queasy for a while just after treatment.  You mum may do ok, but if she has any problems be sure she lets her medical team know to get their advice. 

If you want to talk anything over please do give us a call on 0808 800 4040, we are around weekdays 9-5.

Best wishes,

Julia