The fast is 21 days. My church is starting the Daniel fast today. I too was wondering what I could eat while on the fast. I was thinking about going back to my pre-op diet, only protein I will consume will be from protein shakes. You can also eat Quinoia, I think thats how you spell it, you can cook it with vegetable stock, it's a whole protein source. Love it. I am 4 months post op.