[The #1 Rule of Fasting](https://medium.com/personal-growth/the-1-rule-of-fasting-b8a0024f55be): Start slow. Don't go from "never having fasted" to a 30-day water-only fast.

The #1 Rule of Fasting [medium.com]: Start slow. Don't go from "never having fasted" to a 30-day water-only fast.