It’s easy to get confused by the sheer number of options for different fasting types. And I’m not here to knock any of them. A water-only fast (zero calorie intake, only water to drink) is wonderful for your health, but very difficult for most people to maintain.  A juice fast has a lot of benefits (and gives you an incredible boost of micronutrients), but autophagy doesn’t kick in nearly as quickly as it does other types of fasting.  And a dry fast (neither water nor food allowed!) can really only be done for one day, max, to avoid some serious health issues related to dehydration.  A modified fast of 3 days feels doable for most people, offers the same health benefits of a water-only fast, and is compatible with real life.