pls help me

i am doing dry fast and Water Fast alternatively and my problem is

i am going to do this fasting for 40 days but the next week my boy friend's bday and i have to eat somethng

and after that can i continu my fasting

ya i know i should start once again thats not a big prblm but my main prblm is that should i gain weight that i loss

how much weight can i gain in one day after that i will surely continue my fasting joureny

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