What is a rolling 72-100 hour fast? You don't eat for 72 hours and then allowed to eat for 100 hours before the cycle starts? How do you source your magnesium/potassium?

Fast for 72-100 hours. Eat normally for 1 day then fast again. Works better with WFH (you want to be near a toilet after breaking a fast). But you can also just time it so your fast ends on Sunday and do it once a week. You do have to be a bit careful about not binge eating after a fast. I don't count the calories on my eating days but I am also conscious about not stuffing my face all day.

Magnesium from random supplement I got at target, potassium from no-salt salt alternative.

Wait so you basically eat once a week? Fast 3 days, eat 1 day, fast 3 days?

There's no way that's healthy, especially longer term.

Well on average it's eating closer to twice a week. People fast for much longer. I think at most I've done 3 in a almost a row - doing stuff with friends will mess stuff up - I fit them in where I can.

You can look into it if you want but there are a lot of people that think its actively good for you. I'm more in it for the weight loss and take anything else as a bonus.