I love fasting, but I usually only do it for religious purposes and for 30 days. If you are not used to fasting, I would only do half day fasts. I usually wake up around 4:45 or 5ish in the morning and prepare foods that will keep me full longer (dates,eggs, meat, bread, yogurt, bananas) and I drink two bottles of water. I break my fast at sunset with some more dates and fruits. I eat a salad and then a piece of meat and I am full for the night
I usually drop around 10-15 pounds after fasting for 30 days and I feel great because I feel cleansed
If you are on medication, I would not fast. It is an interesting experience, but if you are not used to fasting just take baby steps.