WARNING TO FASTERS WITH
If you have a major illness such as diabetes, kidney problems, liver problems, heart problems or ulcers, do not fast without consulting a professional. Be sure to read the chapter, "Consulting A Doctor."
Fasting puts the body under a strain. The liver and kidney are organs of purification and elimination that will go into overtime during a fast. Blood sugar levels change drastically as stored glycogen is converted into glucose (blood sugar) for use by the body. That can be extremely risky for a diabetic. The toxic shock of poisons being eliminated can literally stop a weak heart.
Although I believe fasting is a divine, correct and beneficial venture, the more we have abused our bodies and the worse condition it is in, the more taxing the fast will be.
Always seek professional advice if you are on any medication.