I fluctuate several lbs each day. Always have. I think it's mostly water retention and things like that. I weigh myself once a week as soon as I get up on Sunday morning before I get dressed. That supposedly will be the most accurate as it's the same time of day, same time of week, etc. There's not much point in weighing every day or more than once a day because of all the fluctuations. Others may have different views on this, but I can definitely say 3-5 lbs. weight fluctuations are pretty normal.