https://www.rabbinicalassembly.org/s...20/ykshatz.pdf
Is a fairly extensive overview of the issue. Passed 18-1 by the CJLS for conservatives, can't find any reform sources that disagree, and I think there is only a bit of disagreement among Orthodox. It gives a pretty specific set of guidelines.
A vignette from another article I saw
"About 150 years ago there was an epidemic going around parts of Lithuania around the time of the High Holidays. Doctor's orders were that nobody was allowed to fast. It seemed, however, that few were willing to follow the doctor's orders. Realizing this, Rabbi Israel Salanter went from synagogue to synagogue on Yom Kippur night and, standing by the ark, he ate before the shocked crowds. Seeing their rabbi eat on Yom Kippur, the masses went home to eat as well."
Basically you should talk to your doctor about your specific place in your process and ask for their decision. This is considered to be the final word as far as the vast majority of rabbinic teaching goes especially if you are reform or conservative. However if your doctor clears you and you feel ill or sick from lack of hydration or food the literature suggests that god demands you eat or drink since injuring yourself isn't the point.
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