There are lots of stories about juice fasting, even tv shows made about people that have cured illnesses by juice fasting, I do strongly believe in it....however, those with severe AF therefore dysfunctional metabolism - i,e insulin resistance and histamine issues, juice fasting can be extremely brutal and leave them in a worst state than before. I tried it for two weeks. It hurt. I think if you in the early stages of AF, juice fasting on vegetable juice at first would be very positive.
But everyones different, why not give it a try? Its definitely a more healthy way than shoving synthetic supplements down our throats! :)