weight gain throughout the day?

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Hi,
I never really post but I was feeling curious about something. I know probably people ask this all the time, but how much weight can you gain throughout the day. For instance if you weigh yourself in the morning and again in the afternoon how many pounds do you gain? I only weigh myself once a week in the morning before eating or drinking anything ,but I got curious just now so I weighed myself and saw a 4-5 pound difference. I know its normal because I drink a ton of water but I was just curious what are other people's fluctuations were. Thanks for sharing.