First off, let's just say grapes are one of the fruits highest in alkalinity when opposed to any other fruit on the planet.
Keeping that in mind, lets state how a necessity for a healthy body is an alkalized body. Alkalized is contrary to toxic, the state where all kinds of diseases are developed.
If body stays toxic for too long, it will eventually develop more serious disease, such as cancer.
That's why, our #1 priority should be to always keep our bodies as alkalized as possible. In a world like this, that might be hard but it's not impossible!
To make this cleanse as efficient as possible, you'd want to blend your grapes to aid your digestion. That's about it! But you can even go with solid grapes, totally up to you.
There are numerous other things you might incorporate in your fast, to make this as smooth experience as possible. As I'm currently busy over the head, I can offer you my guidance through some of the canals I use to communicate with Steemit community...
10 Reasons Why Grape Fast is Badass (in my experience):
Feeling better than ever
Master toxin cleanse
Ultra high energy levels
Healing of whole body
Improved feeling of everything
The body can't get enough of it
Lightness in mind & spirit
Glowing skin
Incredible bowel movement
Mental clearness!
If you feel like this type of fast is the one for you, make sure to contact me here so we can arrange a chat or smth! I'm available at Discord 
I'd be glad to guide you through my version of the fast so you can upgrade yourself in a matter of days!
This is something that has the potential to change your life, so don't take it easy :)