I juice fast! A juice fast is when you don't eat for a period of time, but you drink juice. Usally the juice is made from home using a juicer. You make the juice from vegetables like spinach, carrots, kale etc. As well as from fruits such as apples, blueberries and plums. It is very good for you, and I am usually not hungry when I juice fast. It will help improve your skin, hair and nails. It also is a detox. :]