Do you fast and if so why and how long do you?
I do if for my own spiritual and personal well being, it helps me clear my head and put things into perspective, Some times I do a partial fast, I will fast all day and break it in the evening. I have fasted for as long as 30 days as well. I will stay well hydrated, especially in the warmer months, I drink mostly water and juices.
I don't usually tell anyone when I am fasting. Its my own personal thing that I do between me and God.
And yes it works very well for me, I do my best thinking when I am fasting. All the best decisions were made while fasting ... When I am fasting longer than a few days the first few are always the hardest, I can get headaches but as long as I keep hydrated I am okay. I really only get hungry the first day or 2 as well. I do prepare myself before I fast.