I do short fasts from time to time of 1-3 days. I like the idea of giving my digestive system a rest and detoxing. I DO find the hunger pangs make it something less to look forward to - therefore doing it less than I should.
So what I've started doing is taking Hoodia pills when fasting. It really cuts back on the hunger pangs or eliminates them, is nothing more than one small herbal pill. The purists who enjoy the trials and tribulations of conquering hunger pangs disagree (though nobody's yet given me any evidence that this harms the fast in any way).
Bottom line, I can fast more often (since I don't dread it as much), for longer periods, and with nothing but water (and a small herbal capsule once or twice a day). I've done it with and without the Hoodia and have never noticed any fewer fasting benefits doing it this way - and so many positives to the experience overall.
I consider it a great fasting aid and am surprised more people don't discuss it or use it. I guess some consider it cheating even though it doesn't harm anything. But I don't fast to earn a metal - just for health benefits.