Is a 42 day water fast safe?

I am currently doing a water fast I am on day 5 I was just wondering if 42 days would be too much I am 5'2 and weigh 120 pounds I am doing it to detoxify and cleanse my body give it a rest but I'm worried I might loose too much weight or harm my body
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Water fasting is only drinking water no food
Is a 42 day water fast safe?
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