My normal eating schedule is 16:8 (intermittent fasting), but I do a 3 or 4-day water fast ever month, plus a 7 day fast every 3-4 months. I'm at a stage right now where I am basically addicted to fasting - I love the feeling of being light as a feather, unencumbered, and it definitely gives me a boost in the creativity/productivity department.

Plus, I haven't been sick since the first 7-day fast I did.