How old are you? If you're past the growing stage (21 or so) it should be fine. Even if you're younger, an occasional fast of a day or two should be no problem. Also, how tall are you? The body is a remarkable thing, and in fasting mode even skinny people can manage to go for quite a while.
The more experienced one is, and the less toxins remaining in one's fat stores, the easier it will be to fast longer periods, though generally one to seven days is plenty, and some teachers consider it counterproductive to go much longer than that. Seven days should be doable for anyone with at least a few pounds of fat.
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