It all depends on how you feel. If you think its OK to have it and still be a fast, have it. I've heard having any dairy breaks the fast, but I use cream in my coffee and don't feel my fast is broken. If you get woozy after a few hours of no food try a juice fast. I can fast for a long time now if I feel moved to it. Water fasts can be serious, plan on a juice fast first.
I was fasting last week and did phyiscal labor on the 4th day, I got a little nervous I might get hurt, so I was very careful, and drank some whey protein throughout the day and ended the fast that evening.
On a water only fast you'll find really quick how your body will respond to the lack of nutrients.
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