If you would have actually read the article, you would know that you can do it 1 day a week if you want. Does it say in the article? No. it's called comprehension.
It's a way of eating.
I've done both the Fast and the Feast. I prefer the occasional fast. I found myself "waiting" or even "salivating" in anticipation of my meal on the Feast.
I find that I always have a great work out on the day of the fast.
I also found the Feast not very sustainable for long term. But that's just me.
I tried it instead of posting and asking permission.