Yea, it's a complete reset of a lot of things, especially your hormone system, particularly insulin, which helps with your metabolism.

The main tips I have are to wear a lot of clothes to bed because you'll get cold from losing your fat. I usually start needing more hot showers around day 4. Also, don't let yourself watch food videos. I found myself watching them one after another after day 7. Finally, try to work out during the fast, especially with weights. There's a lot of evidence that it triggers significant testosterone production.

Also, you'll have to generally move a little slower, especially from sitting and lying positions. Lightheadedness is normal, just take your time.