Thank you for your thoughtful comment! :-)
Yes it's very true that if not done properly an extended water fast can be quite dangerous!
I always recommend that people very carefully do their own research before beginning, since water-fasting is still very misunderstood by so many, certainly including those in the medical profession.
If one is interested in perusing a water fast and feels the need to consult a medical professional then they should consult a doctor that actually has good experience and practice with extended water-fasting, since the average doctor on the street as it were, may actually be quite clueless, and or have wrong information.
Great advice. Thanks.