Why is water fasting so much more difficult than juice fasting?

Anonymous
I tried to switch from my juice fast to a water fast after fasting for five days and I couldn't do it. I got terrible headaches, I couldn't work out, I was extremely dizzy, I couldn't sleep, and I was nauseous. I drank tons of water the entire day to prevent dehydration but ended up drinking juice to help me fall asleep.
Why is water fasting so much more difficult than juice fasting?
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