I'm almost reaching 48 hours. I'm aiming for 72 hours but will settle for 48. On the day 2, you can reach darkest purple for ketone. What's the health benefit for pushing till 3rd day compare to 2 day only?
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I've heard that 48 hours is the beginning of autophagy, so any time beyond that is beneficial for that purpose. Also for repair of leaky gut syndrome you want more than 3 days. For me, 3 days is just a step in doing a regular 5 day fast once a month.