I have fasted some, before, but I'm not very good at it I'm afraid. Flesh is strong, and we Western Christians give in too easily.
I will say this, though, I think it's easier to fast if it's done in the context of community. I had a friend in college who was Jewish, and one of the Jewish feasts that he went to they all gathered in a high school gymnasium and ate nothing, drank nothing -- for however long it lasted. He told me, "The only thing we swallow the entire time is our own spit."
He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God? ~ Micah 6:8