That&#x27;s awesome.<p>My longest fast was 5 days. My personal experience was that starting from day 3 I was a little &quot;lethargic&quot; or basically slow in the morning, but that feeling went away fairly soon, and by 10 AM I was operating as normal.<p>But things like climbing up the stairs got noticeably more difficult, even though I&#x27;m a physically active person. I would not dare walking 12 kilometers while fasting, except maybe shortly before breaking of the fast.<p>Anyway - no noticeable hunger, no nausea or vomiting and the bowel movements also stopped on day 1 or 2, so quite a fun experience overall.