An excellent book focussing on nutrition and life after cancer: -

https://www.waterstones.com/book/keep-healthy-after-cancer-2020/robert-thomas/paula-radcliffe/9780955821257

about the author...

"Professor Robert Thomas MRCP MD FRCR trained as a cancer doctor at the Royal Marsden Hospital and is now a Consultant Oncologist at the Primrose Oncology Unit, Bedford and Addenbrooke’s, Cambridge University Hospital Trusts, specialising in the treatment of breast, bowel and prostate cancer. He is a Professor of exercise and biological science at the University of Bedfordshire and a regular teacher at Cambridge University.".