Fasting was advocated by Jesus and the old testament prophets.

Fasting does cause heart and kidney problems [1]. Towards the end of my 6 years in a christian cult where we were forced to do 2 day fasts every semester, my heart and kidneys were basically failing. The fasting could have been a significant factor. I also developed insomnia during this time which has lasted 13 years so far without a full nights sleep.

All that said, fasting is a tool for proving to God that you would sacrifice your life for what you are praying for. And it does work.

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