I still, occasionally, do three day fasts. I used to do sevens and once did a 21 day. Don't have the discipline to do more than three anymore. Even a few years ago, on day four after breaking the fast, I'd have a surge of energy the likes of which you'd have to experience to understand. Now, on day four .... I'm just beat and weak. I'll try one (three day fast) again ... give it at least two times. If I'm getting the same reaction .... that of being totally drained, as opposed to the old energy rush (and it was a rush) .... I'll just figure that fasting ain't for this old fart.