From the BCNA website
https://www.bcna.org.au/health-wellbeing/physical-wellbeing/healthy-eating/As to Dr Google - as afraser said previously, steer her away, she can't be confident that what's she's reading is correct. At her stage of treatment her Medical team are her go to!
Your previous posts suggests your Mum is stubborn and hence you need to be gentle in redirecting her
The link above is from the BCNA website. The website is a wealth of information and the forum is a wealth of experience
Take care and look after yourself as well as