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No need to consult a doctor for this diet unless you have stomach issues or low blood sugar problems since you will definitely faint in the first day (or in the last days if you plan to continue this diet for long). The diet has been used among Muslims as part of their religion ceremonies. They have to fast from the sunrise to the sunset of their local time for a whole month called Ramadan. I resulted a 12 kilograms lost in a 2 month intermittent fasting.