Hi Chiron,
there are very few contraindications to water-fasting but I know that there is a consensus of opinion amongst experienced health-fasting-supervisors that Liver cancer is a definite contraindication.
Reasons?
I am not sure.........so you have stumped me on that one.
EDIT.......
"There are individuals who are not good candidates for therapeutic fasting. But there are few conditions per se that contraindicate its appropriate use.
The greatest contraindication to fasting is fear. A lack of understanding of the fasting process can present insurmountable problems. Extreme weakness in various diseases associated with muscular wasting may also contraindicate fasting.
There are numerous medications that can complicate the fasting process. Inadequate nutrient reserves would be another potential contraindication to fasting. (Certain types of cancer) and severe kidney disease may also make an individual a poor fasting candidate............
Dr. Alan Goldhamer