I've done this as well and I second it. I did a 5 day fast and treated myself to a massive breakfast on the 5th day. It was glorious and really reminded myself of not needing so much junk. I fast whenever I feel myself slipping. It's an amazing tool!

For these longer fasts, I just drink water and electrolytes.

If I ever get fat, I would fast my way to success honestly. If you do it right it seems healthy!