72 hr fast questions.

I want to maximise autophagy so I am thinking of doing 72 hr fasts every week starting friday morning up till monday morning. This is what I've researched so far: 18-20 hrs: - Autophagy begins - Ketones released 36 hrs (1 ½ days) - Autophagy increased by 300% 48 hrs (2 days) - Cellular regeneration starts - Inflammation goes down 72 hrs (3 days) - Autophagy peaks 1. From what I've heard, some people do like 3+ day fasts going up to 5 days or more. Are they only doing this for faster fat loss or is there some kind of benefits I don't know yet? 2. After a fast some people eat and then get right back into a fast for the following days to come. Is this also just for fat loss. 3. When you break your fast I understand you have to eat light at first but do you have to eat your normal calories for that 1 day or should you eat a lot more because you fasted? That is all, thanks.